JPH06285695A - Powder forming device - Google Patents

Abstract

PURPOSE:To reduce difference in the powder filling quantity between powder filling parts by providing a feeder with a structure in which a scraper is provided on the lower end of a side wall in the reciprocal direction of a feeder cup. CONSTITUTION:An upper punch, lower punch 11, die 10, feeder 1, etc., are the basic components of the powder forming device. On the outside of the side wall in the forward and backward moving direction of the feeder cup 3 of the feeder 1 for supplying a powder, a plate like scraper 4 constituted of an elastic material is fixed by a fixing screw 5. The side wall 6 in the advancing direction of the feeder cup 2 is provided with a notched part 7 on the lower end of the side where the scraper 5 is attached; and in a state where the feeder cup 2 is slid on the die 10 and the end face of the die 10 on the side of the advancing direction passes through the position of the scraper 4, it is used as a space for storing the scraper 4 when sprung up by the feeder cup 2 of the scraper 4, and damage to the scraper 4 is prevented. Thus, the difference of a powder filling quantity is reduced, and the variation of a product is reduced.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a powder molding machine,
In particular, it relates to the structure of the powder feeding feeder section of the apparatus.

[0002]

2. Description of the Related Art Generally, when a powder compact is molded by using a powder molding device, a powder feeding feeder of a conventional molding device is
As shown in FIG. 4, after the powder is supplied from the feeder pipe 3 into the feeder cup 2, the feeder cup 2 slides on the upper surface of the die 10 in the front-rear direction indicated by the arrow 12, so that the lower surface of the feeder cup 2 moves. Powder is filled in the powder filling portion 9 of the die 10 in the ground state. When a press machine using a die 10 having a plurality of powder filling parts 9 is operated at high speed for molding, due to the fluidity of the powder,
The powder filling amount may differ between the powder filling units 9. When a plurality of products having the same shape are molded at the same time, the difference in the powder filling amount causes variations in the product dimensions and characteristics, resulting in a decrease in yield and problems in terms of quality and cost.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to improve the structure of the feeder of a powder molding apparatus for powder compacting by using a plurality of dies, and to reduce the difference in the powder filling state between molded objects. The object is to provide a powder compacting apparatus capable of supplying high-quality and inexpensive products in which variations in product dimensions and shapes are reduced.

[0004]

In order to solve the above-mentioned problems, the present invention provides a powder molding apparatus having an improved structure of a powder feeding feeder portion of a powder molding apparatus. When the feeder scrapes the powder from the upper surface of the powder filling section of the die, the position of the lower punch should be adjusted according to the position in the die so that the powder filling section that is less filled may have a predetermined amount of powder or a little overfill. Is adjusted, and the powder is scraped out from the excessively filled powder filling section with a scraper attached to the front of the feeder, and a powder molding apparatus having a structure capable of uniformly filling each powder filling section is provided. That is, the present invention is
In a powder molding apparatus having an upper punch, a lower punch, a die, a feeder, and the like as basic components, a plate-shaped scraper made of an elastic material is attached to the outside of a side wall of a feeder cup of a powder supply feeder in the front-rear moving direction. The powder molding apparatus is characterized by the above structure.

[0005]

[Operation] A scraper is provided on the outside of the side wall in the moving direction of the feeder cup of the powder supply feeder of the powder molding apparatus, and the height of the scraper is adjusted by the way the powder is filled in each powder filling section. By doing so, the powder is scraped out from the overfilled powder filling part with a scraper so as to meet a predetermined filling amount, so the difference in the powder filling amount between the powder filling parts is reduced, and the dimensional variation of the product is reduced. Thus, a powder molding apparatus capable of improving the quality and yield can be obtained.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a cross section around a feeder of a powder molding apparatus according to an embodiment of the present invention, and FIG. 2 shows a positional relationship of scrapers based on a relative positional relationship between a die and a feeder in the powder molding apparatus shown in FIG. FIG. 3 is a partially sectional side view of the periphery of the feeder as seen from the traveling direction of the embodiment shown in FIG.

As shown in FIG. 1, the powder feeding feeder 1 slides above the powder filling portion 9 formed between the die 10 and the lower punch 11 while being in contact with the upper surface of the die 10. The powder filling section 9 is filled with the powder 8. This feeder 1
A scraper 4 made of a plate-shaped elastic material (a rubber plate in this example) is fixed to the lower end of the side wall 6 in the traveling direction of with a fixing screw 5. The side wall 6 in the traveling direction of the feeder cup 2 of the powder molding apparatus of the present invention is provided with a cutout portion 7 at the lower end on the side where the scraper 4 is attached, and as shown in FIG.
When the feeder cup 2 slides on the die 10 and the end surface of the die 10 on the advancing direction side has passed the position of the scraper 4 (state A indicated by a chain line in FIG. 2), the scraper 4
Is used as a space for accommodating the scraper 4 when it is flipped up to the feeder cup 2 side, and prevents damage to the scraper. As shown in FIG. 3, when two powder compacts of the same shape are machined at one time, scrapers 4 having a width substantially equal to the width of the powder filling portion 9 are attached above each powder filling portion 9. Here, when filling without the scraper 4,
When the powder filling unit 9 on the left side of FIG. 3 tends to be filled exactly as planned but the powder filling unit 9 on the right side tends to be filled more than expected, as in the scraper 4 of FIG.
Is fixed and fixed at the same position as the lower surface of the feeder cup 2 by the fixing screw 5, and the right scraper 4 is fixed by the fixing screw 5 by lowering the lower end by an amount corresponding to the excess.
By sliding the feeder in this state, at the powder filling portion 9 on the left side, the lower surface of the feeder cup 2, that is, the die 1
0 The powder is supplied in the upper surface scraped state, but since the powder on the upper side is scraped out by the scraper 4 in the powder filling section 9 on the right side, less powder is filled than in the die upper surface scraped state, and the powder of both the left and right pressed compacts is formed. Are molded to the same density.

With the powder compacting apparatus of this embodiment, the upper surface is 1
Molded with a mold that can mold two ferrite cores of 5 mm x 13 mm and about 30 gr / piece at a time,
In the past, the variation between powder-filled portions was about 2%, but it could be reduced to about 0.5% or less.

[0009]

As described above, by using the powder compacting device of the present invention having the feeder having the structure in which the scraper is provided at the lower end of the side wall in the reciprocating direction of the feeder cup, the difference in the powder filling amount between the powder filling parts is reduced. It was possible to reduce product variations.

[Brief description of drawings]

FIG. 1 is a front view showing a cross section around a feeder of a powder molding apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged front view of the periphery of the scraper for explaining the positional relationship of the scraper based on the relative positional relationship between the die and the feeder in the powder molding apparatus shown in FIG.

3 is a partial cross-sectional side view of the periphery of the feeder as seen from the traveling direction of the embodiment shown in FIG.

FIG. 4 is a front view showing a cross section around a feeder for supplying powder of a conventional powder molding apparatus.

[Explanation of symbols]

 1 Feeder 2 Feeder cup 3 Feeder pipe 4 Scraper 5 Fixing screw 6 Side wall (in the moving direction of the feeder cup) 7 Notch part 8 Powder 9 Powder filling part 10 Die 11 Lower punch 12 (Indicating the moving direction of the feeder cup) Arrow

Claims (1)

[Claims] 1. A powder molding apparatus having an upper punch, a lower punch, a die, a feeder and the like as basic components, and a plate-shaped material made of a material having elasticity on the outer side of a side wall of a feeder cup of a powder supply feeder in a front-rear moving direction. Scraper
Powder molding equipment featuring an attached structure.