JPH07290293A - Powder press molding device - Google Patents

Abstract

PURPOSE:To integrally mold bobbin-shaped molded goods constricted in the middle by packing powder into an upper mortar, pressurizing this powder by using an upper pestle and a lower pestle, opening divided sliding mortars and the upper mortar, moving the lower pestle and extruding the molded goods from the upper mortar. CONSTITUTION:This molding device 19 provided with the upper mortar 2, sliding mortar 3 and lower mortar 4 which are dividable. After the powder is directly packed into the lower mortar 4, the lower pestle 5 and the second lower pestle 6 are moved to the position for starting pressurization, where the powder is packed from the upper mortar 2 in the state of packing the powder into the lower mortar 4. The power is pressurized by the upper pestle 1 and the lower pestle 5 and further the second lower pestle 6, by which the bobbin-shaped molded parts are formed. Further, the sliding mortar 3 and the upper mortar 2 are opened to avoid hindering discharge of the molded goods at the time of discharging, by which the discharging without breaking the molded goods is made possible. As a result, the molded goods having intricate shapes, such as uniform and dense bobbins constricted in the middle, are integrally formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder press molding apparatus for integrally molding a molded product constricted from powder.

[0002]

2. Description of the Related Art Conventionally, when a ferrite bobbin-shaped core for an inductor is manufactured, after powder is molded into a cylindrical bullet shown in FIG. 3B by press molding as shown in FIG. , (C), the bobbin-shaped core of (d) was prepared by automatic cutting with a diamond wheel. The configuration and operation of FIG. 3 will be briefly described below.

FIG. 3 is an explanatory view of the prior art. FIG. 3A shows an outline of press molding. Ferrite powder is filled in a glass, and the upper punch is moved downward to perform press molding.

FIG. 3B shows a state in which a cylindrical bullet is molded by the method shown in FIG. FIG. 3C shows how the cylindrical bullet produced in FIG. 3B is cut with a diamond wheel. Here, the bullet is held by a rotating rubber grindstone and automatically cut by a diamond wheel.

FIG. 3D shows the bobbin-shaped core after being cut by the mechanism of FIG. 3C.

[0006]

Conventionally, when a bobbin having a medium waist is formed from powder, as described above with reference to FIG. 3, a cylindrical bullet is once formed from the powder by press molding, and the bullet is cut. Then, a bobbin having a desired shape and a constriction is produced. As described above, since it is difficult to powder-form a complicated shape such as a constriction, it is necessary to press-form a cylindrical bullet once and then automatically cut it to produce a bobbin of a desired shape. was there.

The present invention solves these problems.
To provide a separate upper and slide, lower and lower, and to directly fill the lower with the powder, then fill the upper with the powder and press-mold to realize the integral molding of the bobbin with the middle waist from the powder. It is an object.

[0008]

[Means for Solving the Problems] Means for solving the problems will be described with reference to FIG. In FIG. 1, the upper punch 1
Is to press the powder in the upper portion 2. here,
The powder is magnetic powder such as ferrite, or powder such as sintered alloy.

The upper part 2 is for filling powder and pressurizing it, and is divided into three or more parts. The slide mouse 3 is a divided mouse for molding the constricted portion of the molded product.

The lower usb 4 is for directly filling and pressurizing the powder. The lower punch 5 presses the powder in the lower punch 4. The second lower punch 6 presses the core portion.

The filling rod 7 fills the lower usb 4 with powder or unfilled powder. The filling tool (chute) 8 is for filling the upperus 2 with powder.

The control unit 10 controls the whole.

[0013]

In the present invention, as shown in FIG. 1, the control unit 10 directly fills the lowerus 4 with powder, then the upperus 2 is filled with the powder, and the upper punch 1 and the lower punch 5 are used to apply the powder. Press to open the separated Slide Usus 3 and Upper Usus 2 and lower punch 5
Is moved to push out the molded product from the upper mouse 2.

At this time, when the powder is directly filled in the lower usb 4, the powder or the unfilled portion of the powder is pushed out into the lower usb 4 by the filling rod 7. Also, lower punch 5
A second lower punch 6 is provided in the central portion of the above, and the powder is pushed out by the second lower punch 6 to the core portion before, simultaneously with, or after the pressing using the upper punch 1 and the lower punch 5.

Further, the upper usb 2 is divided into three or more parts, and after pressurization, the upper usb 2 is slightly opened so that the lower punch 5 serves as a guide for smoothly pushing the molded product from the upper usb 2 to the outside.

Therefore, by providing the divided upper uss 2, slide uss 3 and lower uss 4, directly filling the lower uss 4 with powder, and then filling the uppers 2 with powder and press-molding, a constriction is formed. It has become possible to directly powder press mold the bobbin of. At this time, the second lower punch 6 is provided and the upper punch 1
After pressing with the lower punch 5 and the second lower punch 6, the powder is extruded to the core portion and pressed to make the core portion of the molded product dense and uniform. Furthermore, the upper punch 2 is divided into three or more parts, and the lower punch 5
When the molded product is discharged by the second lower punch 6, the molded product can be discharged without chipping by providing a role of a guide.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the construction and operation of an embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 shows a block diagram of an embodiment of the present invention.
FIG. 1A shows an overall sectional view. Here, the filling tool 8
Is for filling powder from the upper part 2. The filling tool 8 shown in the figure slides right above the upper mouse 2 and
After dropping the powder into the inside of the container, it is ground horizontally and filled.

FIG. 1B shows a top view of the upper head. The upper mold 2 shown in the figure is divided into four parts, and when the powder is pressure-molded by the upper pestle 1 and each is slightly opened outward, when the molded product is pushed up by the lower pestle 5. An example of division into three or more divisions is shown to serve as a guide.

FIG. 1C shows a top view of the slide mouse. The illustrated slide mouse 3 is divided into two parts, and after the powder is pressure-molded, the lower punch 5 is opened in an outwardly opened state.
The following shows an example of division when the molded product is divided into two or more so as not to get in the way when it is pushed up.

Next, in accordance with the steps (a) to (f) of the molding step flow of FIG. 2, the steps for filling the powder and molding the bobbin having the narrow waist under the configuration of FIG. 1 will be described in detail. To do. FIG. 2A shows a state of lower us filling. In this state, as shown in the drawing, the lower rod 4 is filled with the powder by the filling rod 7.

FIG. 2 (b) shows the state of the upper filling. This is because, from the state of (a), the lower punch 5 and the second lower punch 6 are pushed upward together to a predetermined position where the pressurization is started, and then the powder is picked up by the filling tool 8 from above. To fill. At this time, the lower usb 4 is directly filled with the powder, and the lower punch 5 and the second lower punch 6 are lifted together, and the lower usb 4 below the slide usb 3 for forming a bobbin-shaped thin constricted portion.
It is possible to fill the portion of the powder sufficiently and surely. After completely filling the lowerus 4, the powder is dropped into the upperus 2 from above and completely filled.

In FIG. 2C, pressure is applied. This is because after pressing from below and above with the lower punch 5 and the upper punch 1, the second lower punch 6 is pushed out until it coincides with the surface of the lower punch 5,
The powder 5 stored between the lower pestle 5 and the second lower pestle 6 is extruded to the core portion and pressed.

Alternatively, the second lower punch 6 is extruded until it coincides with the surface of the lower punch 5 before or at the same time as pressure is applied from below and above by the lower punch 5 and the upper punch 1, and between the lower punch 5 and the second lower punch 6. The accumulated powder 5 is extruded to the core and pressed.

In this or other case, the powder accumulated in the space between the lower punch 5 and the second lower punch 6 is extruded to the core portion by the second lower punch 6 and pressed to form a compact, so that the slide mouse is formed. By 3, the powder and pressure were applied sufficiently to the narrowed portion, and it became possible to mold a uniform and dense bobbin-shaped integrally molded product.

In FIG. 2D, the sheet is discharged. As shown in the figure, the divided parts of the upper part 2 are opened outward to make it convenient for the guide when ejecting the molded product.
After opening the slide mouse 3 almost completely outside so that it does not interfere with the ejection of the molded product, move the lower punch 5 and the second lower punch 6 together and push them up a little above the upper mouse 2. . At this time, the upper punch 1 is pulled upward so as not to disturb the discharge of the molded product.

FIG. 2E shows the return state. As shown in the figure, the molded product is lifted from the position of the upper mouse 2 by an electromagnet or the like to be discharged, the upper mouse 2 and the slide mouse 3 are closed, and the lower punch 5 and the second lower punch 6 are moved downward. Moving. The second lower punch 6 is further lowered from the tip of the lower punch 5 so that the powder is accumulated. And
The filling rod 7 is pulled out to the left to start filling the powder into the lowerus 4.

FIG. 2 (f) shows a lower us fill. As in the case of FIG. 2A, the filling rod 7 fills the powder or the unfilled portion of the powder is filled in the lower glass 4. Then, the process is repeated from (b) of FIG.

As described above, the upperus 2, the slideus 3, and the lowerus 4 which can be divided are provided, and the powder is directly filled in the lowerus 4, and then the lower punch 5 and the second lower punch 6 are pressed. After filling the powder from the upper mouse 2 in a state where the powder is completely filled in the portion of the lower mouse 4 by moving to the position of, the upper punch 1 and the lower punch 5 and the second lower punch 6 add the powder. Press to form a bobbin shaped article. At this time, the powder accumulated in the portion of the second lower punch 6 is extruded by the second lower punch 6 to the core to pressurize the powder, thereby supplying the powder to the core of the bobbin having the middle neck to uniformly and densely apply the powder. It became possible to mold by pressing. Further, at the time of discharging, the slideus 3 and the upperus 2 are opened so as not to interfere with the discharging of the molded product, so that the molded product can be discharged without being damaged. With these ideas, it was not possible to integrally form a bobbin with a constriction in the past, but for the first time in the present invention it was possible to integrally mold a molded product of a complicated shape such as a bobbin with a constriction that is uniform and precise .

[0030]

As described above, according to the present invention,
Since a divided upper us 2, a slide us 3, and a lower us 4 are provided, and the lower us 4 is directly filled with powder, then the upper us 2 is filled with powder and pressure-molded, a middle neck is formed. It was possible to directly form the bobbin-shaped molded product of (1) directly with powder. At this time, (1) a second lower punch 6 is provided, and a predetermined amount of powder is accumulated between the lower punch 5 and the second lower punch 6, and the upper punch 1 and the lower punch 5 are pressed before or simultaneously. Alternatively, later, the powder accumulated by the second lower punch 6 was extruded and pressed, and the powder was extruded to the core of the molded product, whereby a uniform and dense molded product could be integrally molded.

(2) After molding in (1), open the slide mousse 3 of two or more divisions to the outside so as not to interfere with the discharge of the molded product, and, for example, the upper mousse 2 of three or more divisions.
Slightly open and let it serve as a guide for the molded product.
Also, the second lower usb 6 was lifted together, and could be smoothly ejected to the upper part of the upper usus 2, and the bobbin-shaped molded product having a middle waist could be smoothly ejected without chipping.

(3) When the powder is directly filled in the lower usb 4, the powder or unfilled powder is completely extruded into the lower usb 4 by the filling rod 7 to fill the lower usb 4 with sufficient powder. It was possible to press-mold the molded product in the lower housing 4 in a precise and uniform manner.

Further, in the conventional process of pressing and molding a bullet from the powder of FIG. 3 and then cutting this bullet, the cutting is not necessary, and the number of processing steps is reduced, and It was possible to save processing materials by eliminating the generation of cutting powder.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a molding process flow chart of the present invention.

FIG. 3 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1: Upper pestle 2: Upper mousse 3: Sliding mousse 4: Lower mousse 5: Lower pestle 6: Second lower pestle 7: Filling rod 8: Filling tool (shoot) 10: Control part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location B22F 3/02 B30B 11/02 F J // H01F 41/02 D (72) Inventor Kazuo Tokari Tokyo 5-36-11 Shimbashi, Minato-ku, Fuji Electric Chemical Co., Ltd. (72) Inventor Takeo Maeda 5-36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd.

Claims (4)

[Claims] 1. A divided upper part (2) for filling powder, a lower part (4) for filling powder, and a constricted portion provided between the upper part (2) and the lower part (4). A divided slide-us (3) for molding, an upper punch (1) for pressurizing the powder filled in the upper usu (2), and a lower punch (1) for pressurizing the powder filled in the lower usu (4). 5) and directly filling the powder into the lower uss (4) and then filling the upper uss (2) with the powder, pressurizing using the lower punch (5) and the upper punch (1), And a control unit (10) for opening the divided slide usu (3) and the upper usu (2) and moving the lower punch (5) to push out the molded product from the upper usu (2). Characteristic powder press molding equipment. 2. A divided upper part (2) for filling the powder, a lower part (4) for filling the powder, and a constricted portion provided between the upper part (2) and the lower part (4). A divided slide-us (3) for molding, an upper punch (1) for pressurizing the powder filled in the upper usu (2), and a lower punch (1) for pressurizing the powder filled in the lower usu (4). 5), a filling rod (7) for extruding and filling the powder into the lower us (4), and after directly filling the powder or the unfilled portion of the powder into the lower us (4) by this filling rod (7) The upperus (2) is filled with powder, and pressed using the lower punch (5) and the upper punch (1) to open the divided slideus (3) and the upperus (2). A control part (10) for moving the lower punch (5) to push the molded product out of the upper mouse (2). Powder press molding apparatus, characterized in that was e. 3. A second lower punch (6) is provided in a central portion of the lower punch (5), and the upper punch (1) and the lower punch (5) are used before, simultaneously with or after pressurization. The powder press molding apparatus according to claim 1 or 2, wherein the powder is pressed by a second lower punch (6) to supply the powder to the core and pressurize it. 4. The upper us (2) is divided into three or more parts, and after pressurization, the upper us (2) is slightly opened and a molded product is pushed out of the upper us (2) by a lower punch (5). The powder press molding apparatus according to claim 1, 2 or 3, which is used as a guide.