JPH0634337Y2 - Powder press equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] Powder compaction, more specifically, powder compaction powder for producing various sintered materials (products) by compaction molding and sintering from powder such as metal powder With regard to the press machine, a powder press machine equipped with a powder feeder that enables filling of powder into the cavity even when using powder with poor fluidity or in the case of cavities with complex shapes (shapes with thin parts) In order to provide a mold having a cavity having a predetermined shape, a pressure punch, and a powder box that contains powder and conveys the powder onto the cavity, a powder press apparatus has a sieve bottom at the bottom of the powder box. And a vibrator for vibrating the powder box is additionally provided.

[Industrial application field]

The present invention relates to a pressure molding of powder, and more particularly, to a powder pressing apparatus for powder molding for manufacturing various sintered materials (products) by powder molding and sintering from powder such as metal powder.

The powder metallurgy method mixes various raw material powders to obtain a desired composition, compacts the mixed powder into a predetermined shape, and
Basically, it is composed of a process of sintering the green compact. Various sintered materials manufactured by powder metallurgy have the advantages that they cannot be obtained by the melting method, such as segregation does not occur, cutting work is hardly required, and mass productivity is excellent. Miniaturization, weight reduction,
It is being used in large quantities in conformity with requirements such as reduction of processing cost.

[Conventional technology]

A conventional powder pressing apparatus for powder compacting by powder metallurgy includes a die having a cavity of a predetermined shape, a pressure punch, and a powder feeder, and a method for filling powder into the cavity is powder feeding. There is a method of filling the powder using only the weight of the powder from the machine, or a method of forcibly filling the powder by reciprocating the powder feeder. As the powder feeder, for example, a mechanism for sliding the upper end face of the mold (sliding reciprocating motion) by using a powder box such as a frame which is a box containing powder but having no bottom Then, the powder contained in the mold cavity is filled with the force of sliding, and when the slide slides back, the scraping is performed.

[Problems to be solved by the device]

In the conventional filling method, bridging may occur and uniform filling may not be possible depending on the case of using powder having poor fluidity or the shape of the mold cavity (particularly, the shape having a thin portion).

On the contrary, this limits the shape of the sintered material,
In some cases, a cutting process must be performed in order to obtain a sintered material having a target shape.

The present invention provides a powder press device equipped with a powder feeder that enables powder to be filled into a cavity even when a powder having poor fluidity is used or a cavity having a complicated shape (shape having a thin portion). The purpose is to provide.

[Means for Solving the Problems]

In the powder pressing apparatus having the above-described object, which has a mold having a cavity of a predetermined shape, a pressure punch, and a powder box that contains powder and conveys it onto the cavity, a sieve bottom is provided at the bottom of the powder box. This is achieved by a powder pressing device characterized in that a vibrator for vibrating the powder box is attached.

〔Example〕

Hereinafter, the powder pressing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a partial perspective view of a powder press according to the present invention,
A mold 2 having a cavity 1 in the shape of a sintered material (product),
Pressure punch (not shown) and powder box 3 which is a powder feeder
An arm 4 for sliding the powder box 3 (directions of arrows A and B) and a guide plate 5. And
A sieve bottom 6 and a vibrator 7 are attached to the powder box 3. The sieve mesh of the sieve bottom 6 is preferably 4 to 50 mesh depending on the particle size and fluidity of the powder used, for example,
Use 18 mesh. Further, various kinds of vibrators can be used as the vibrator 7, and, for example, an amplitude 1 to
A vibration of 50 to 200 Hz can be given with 2 mm. A compressed air hose 8 is attached to the air vibrator 7. The guide plate 5 is installed at the same level as the upper end surface of the mold 2, and the powder box 3 is adapted to slide on the mold 2 and the guide plate 5 by the arm 4 of the reciprocating drive (not shown). The powder box 3 is loosely engaged with the arm 4.

A powder compact is formed as follows using the above-mentioned powder pressing device.

First, the powder box 3 is placed on the guide plate 5, and a predetermined mixed powder (Fe powder and Ni powder having a particle size of 1 to 10 μm, lubricant added) is put therein. Move the arm 4 and slide the powder box 3 in the direction of arrow A to move the cavity 1 of the mold 2 as shown in FIG.
Bring it up. Here, the air vibrator 7 is operated to give the powder box 3 vibration of 100 Hz and 1 mm amplitude, and the powder is filled in the cavity 1. And the air vibrator 7
After stopping, the powder box 3 is slid by the arm 4 from above the mold 2 onto the guide plate 5 to perform grinding. Next, a pressure punch is put into the cavity to compress the powder,
Use green compact. Then, by taking out from the mold 2, a green compact having a predetermined shape is obtained.

As a comparative example, a powder box without a sieve bottom and a vibrator is used to fill the same powder into the cavity 1 by the above-described powder pressing device. In this case, the mixed powder is put in the powder box on the guide plate 5, and the mold 2 is moved by the arm 4.
The powder box is slid upward to fill the cavity 1 with the powder, and the arm 4 is returned to perform grinding. When the filling state in the cavity 1 is observed, the powder may not be completely filled (in the narrow portion) depending on the location of the cavity, and the filling is not uniform as a whole.

On the other hand, in the powder feeder according to the present invention, that is, in the powder box having a sieve and being vibrated, the powder can be uniformly filled in the cavity.

[Invention of device]

According to the present invention, a sieve can be provided in the middle of the powder filling path to the mold cavity, and by vibrating the sieve, the powder can be dispersed and uniformly filled in the cavity. This improves the strength of the green compact and improves the yield of the green compact.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a powder pressing device according to the present invention. 1 ... Cavity, 2 ... Mold, 3 ... Powder box, 6 ... Sieve bottom, 7 ... Vibrator.

Claims (1)

[Scope of utility model registration request] 1. A powder pressing apparatus comprising a die having a cavity of a predetermined shape, a pressure punch, and a powder box for containing powder and transporting the powder onto the cavity, the bottom of the powder box (3). A powder press machine, characterized in that a sieve bottom (6) is provided and a vibrator (7) for vibrating the powder box (3) is additionally provided.