JPH0748603A - Green compact forming device - Google Patents

Abstract

PURPOSE:To fill a powder in a rubber vessel densely and consequently to prevent the cracking of the formed green compact by deaerating the powder. CONSTITUTION:A rubber vessel M housed in a die D and the members s5 and s6 for deaerating a powder injected in a filling guide G placed on the die are provided to constitute a green compact forming device Rp. Consequently, the orientation of the powder is enhanced, and the productivity of the green compact is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a rubber container to store powder (hereinafter, also simply referred to as "powder") of a permanent magnet, a soft magnetic material, a dielectric material or the like in the rubber container. The present invention relates to a compacted powder compacting apparatus for producing a compacted compact by compressing it by using the pressure of a punch of a die press machine and the deforming force of rubber in a rubber container after densification.

[0002]

2. Description of the Related Art Conventionally, there has been known an apparatus for manufacturing a powder compact by compressing the powder with a punch after filling the powder into a rubber container using a filling guide or the like.

[0003]

Conventionally, when a powder compact is manufactured, a through hole having a shape substantially the same as or smaller than the planar shape of the powder compact to be manufactured is formed on a rubber container. After placing the filling guide, the powder is filled into the filling guide in a predetermined amount beyond the rubber container, and a rod-shaped pusher is inserted into the through hole of the filling guide. A powder compact is manufactured by compressing and filling in a container.

However, when the powder is compressed, the filling guide and the pusher are fitted in a substantially hermetically sealed state so that the powder does not blow out from the gap between the through hole of the filling guide and the pusher inserted in the through hole. Since there is no escape area for the air contained in the powder, the air remains in the powder, or the powder cannot be packed into the rubber container at a high density. There was a problem. In particular, when air remains in the powder, there is a serious problem that the molded powder compact is easily broken, or the powder cannot be effectively oriented in a magnetic field or an electric field. It will cause it.

An object of the present invention is to solve the above-mentioned problems, and to provide a compacting device for molding a powder compact having excellent workability and productivity.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a compacting device for molding a powder compact by injecting into a rubber container housed in a die and a filling guide placed on the die. A degassing member for degassing the powder thus obtained is provided. Examples of the present invention will be described below with reference to the drawings, but the present invention is not limited to these examples without departing from the gist of the present invention.

FIG. 1 is a cross-sectional view of a powder compacting body molding apparatus Rp, in which M is fitted into a recess m1 formed by a cylindrical die D and a lower punch Pb inserted into the die D. It is a cylindrical rubber container. The rubber container M is provided with a space m2 having a predetermined shape according to the shape of the green compact to be manufactured.

F is a machine base of the powder compacting apparatus Rp,
The support plate f1 is attached to the machine base F by a suitable fixing means such as a bolt f2, and the lower punch Pb is attached to the support plate f1 by a suitable fixing means such as a bolt f3. The height of the lower punch Pb can be adjusted by appropriately using the support plates f1 having different thicknesses. E is a spring member such as a leaf spring arranged between the die D and the support plate f1. When the powder in the rubber container M is filled with high density by a pusher described later and the powder is oriented in a magnetic field or an electric field, an unillustrated upper punch placed on the die D is lowered, The die D further moves down against the spring force of the spring member E to deform the rubber container M, further compress the powder in the rubber container M, and further stabilize the powder orientation.

G is a filling guide, and the filling guide G has a horizontal sectional shape substantially corresponding to the planar shape of the space m2 of the rubber container M or the space m2 of the rubber container M.
Through hole g having a horizontal cross-sectional shape smaller than the planar shape of
In order to guide 1 and the powder to the rubber container M, an inclined guide hole g2 having an inner surface inclined outward from the upper end of the through hole g1 is formed.

Reference numeral B denotes a pusher which is vertically moved by an appropriate actuator (not shown), and a tip portion b1 of the pusher B is constructed so as to fit into the through hole g1 of the filling guide G in a substantially hermetic manner. However, it is preferable that the pusher B is configured to be replaceably attached to the base portion b2 of the pusher B by a suitable fixing means such as a screwing means. A tubular body made of rubber or synthetic resin may be fitted to the tip portion b1 of the pusher B.

Reference numeral S denotes a substantially cylindrical sealing device fitted in the pusher B, and an upper portion s1 of the sealing device S is slidable in a vertical direction on the surface of the pusher B through an appropriate sealing member s2. It is configured. A compression spring s3 is arranged between an upper part s1 of the sealing device S and a base part b2 having a diameter larger than the tip part b1 of the pusher B, and the sealing device S has a key b3 or the like attached to the tip part b1 of the pusher B. The downward movement is restricted by a suitable member. A sealing member s5 made of rubber or the like is attached to the lower end s4 of the sealing device S. s6 is a deaeration pipe connected to a deaeration device (not shown), which is connected to the through hole s7 of the sealing device S.

The powder filling process of the compacted powder compacting apparatus Rp having the above-mentioned structure will be described below. First, the rubber container M is fitted into the recess m1 formed by the cylinder-shaped die D attached to the machine base F and the lower punch Pb inserted into the die D, and then, not shown. The filling guide G is placed on the upper part of the die D by a robot device or the like. In addition, the bulging portion g3 arranged on the lower surface of the filling guide G is replaced with the concave portion m3 arranged on the upper surface of the rubber container M.
The filling guide G and the rubber container M
Is preferably configured to fit in a sealed manner.

Next, a predetermined size of the through hole g1 of the filling guide G is passed over the space m2 of the rubber container M and the rubber container M, which are formed in a predetermined shape according to the shape of the powder compact to be manufactured. Inject powder appropriately to height.

After that, an appropriate actuator (not shown) is operated to lower the pusher B. Before the tip end b1 of the pusher B is fitted into the through hole g1 of the filling guide G, as shown in FIG. 1, the sealing member s5 of the sealing device S has the inclined guide hole g2 of the filling guide G.
Is configured to contact the surface of. Next, a deaeration device (not shown) is operated to deaerate the air in the sealing device S and the rubber container M closed by the sealing device S through the deaeration pipe s6.

After the predetermined deaeration work is completed, the tip end b1 of the pusher B is fitted into the through hole g1 of the filling guide G and the pusher B is lowered to fill the powder with high density, and the rubber container M A powder compact having a predetermined shape corresponding to the space m2 is molded.

It is preferable to perform deaeration so that the inside of the rubber container M is at or near atmospheric pressure when the pusher B is lowered to the lowest end. If the inside of the rubber container M is in a negative pressure state when the pusher B is lowered to the lowermost end, it is difficult to remove the pusher B and the filling guide G after the filling is completed, and the pusher B is lowered to the lowermost end. At this point, if the inside of the rubber container M is in a large positive pressure state, deaeration becomes insufficient, and after the completion of filling, problems such as cracking of the powder compact and blowing out of powder occur.

After that, the pusher B is raised and the filling guide G is removed from the upper part of the die D. In the next step, the powder is oriented in a magnetic field or an electric field, and then the pressure by the punch of the die press machine and the rubber container. The powder is further compressed by utilizing the rubber's deformation force to produce a powder compact.

FIG. 2 shows another embodiment of the present invention. In this embodiment, instead of the through hole s7 formed in the sealing device S, a degassing hole g4 is directly formed in the filling guide G. Then, the degassing pipe g5 is connected to the degassing hole g4. In this embodiment as well, the sealing device S can be arranged as shown in FIG. 2, but since the degassing hole g4 is directly formed in the filling guide G, the sealing device S is
Can be omitted. That is, the space m of the rubber container M
2 and rubber container M, and after appropriately injecting powder up to a predetermined height of through hole g1 of filling guide G, pusher B
And the tip portion b1 of the pusher B closes the through hole g1 of the filling guide G. Next, the degassing device is operated to pass through the degassing hole g4 and the degassing pipe s6, and the through hole g of the filling guide G closed by the tip portion b1 of the pusher B.
1 and the air in the rubber container M are deaerated. The sealing device S can be omitted by carrying out the steps described above. Other configurations are the same as those shown in FIG.

FIG. 3 shows another embodiment of the present invention, which is a combination of both the embodiments shown in FIGS. 1 and 2 described above. That is, the sealing device S is provided with a through hole s7, the through hole s7 is connected with a deaeration pipe s6, the filling guide G is provided with a deaeration hole g4, and the deaeration hole g4 is connected with a deaeration pipe s6. Is. With this configuration, the deaeration work can be performed in a shorter time, so that the productivity of the green compact can be improved.

[0020]

Since the present invention is constructed as described above, it has the following effects. By degassing the air contained in the powder, the powder can be packed into the rubber container at a high density, therefore, it is possible to reliably prevent cracking of the molded powder compact, The orientation of the powder can be increased. Further, the productivity of the green compact can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a powder compact molding device according to the present invention.

FIG. 2 is a cross-sectional view of a powder compact molding device according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a powder compact molding device according to another embodiment of the present invention.

[Explanation of symbols]

 D: Die B: Pusher G: Filling guide M: Rubber container Pb: Lower punch S: Sealing device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B65B 1/26 H01F 41/02 G 8019-5E D 8019-5E (72) Inventor Masato Sagawa Kyoto Prefecture 1 Erie Part 2 No. 401, Intermetalix Co., Ltd. 22-22 Matsumuro Ouemachi, Nishikyo-ku, Kyoto

Claims (1)

[Claims] 1. A powder compact formed by arranging a rubber container housed in a die and a deaeration member for deaerating powder injected into a filling guide placed on the die. Molding equipment.