JPS58116999A - Method and device for packing in powder compacting - Google Patents

Abstract

PURPOSE:To scrape away the raw material powder on the outside circumference of the die hole of a die after packing and to form a ring-like level difference in the stage of packing raw materials into the die from a feeder box by sliding the projecting parts of pins mounted to a spacer with the outside circumference of the die hole of the die as guides. CONSTITUTION:The moving pins 7a of a spacer 7 are repulsively energized respectively in lateral directions by means of springs 7b, and the lower parts thereof are partly projected. The spacer 7 is mounted to a feeder box 6, and while the projecting parts of the pins 7 are held inserted in the drafts 1b of a die 1, the box 6 is advanced. Then, raw material powder is packed in the die hole of the die 1 and the preceding end parts of the pins 7a come to the front drafts, by which the packing is completed. When the box 6 retreats, the preceding end parts of the pins 7a move along the inside circumferential surface of the die and scrape away the moved parts like a ring.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention applies to
, relates to a method for filling raw material powder into a corrugated shape and an apparatus therefor.

In powder compaction using a press, the powder filled in the die is pressed between the punches below F to form a star-shaped green compact. Therefore, in order to obtain a green compact with uniform density,
It is desirable to fill the raw material powder in a shape similar to the shape (side cross section) of the green compact in the compression direction. For example, a powder compact with seven flange on the outer periphery of the upper end of a cylinder, that is, the side cross section is shown in Figure 1 (b).
When trying to obtain a compact having a T-shape as shown in FIG. (form hole), pour the raw material powder into this, cut one piece of soil surface and fill it in a T-shape similar to the green compact as shown in the figure, and then combine it with the integrated upper punch 3 and the multi-stage lower By compressing with the bunches 2a and 2b, a green compact with uniform density at each part can be obtained.

In this case, if there is a partial step on the upper punch side as shown in Figure 2 (A), and if the P punch 3 is used as an integral punch and the density difference is adjusted on the upper punch side, 0/ξ mm is as shown in Figure 6. As shown in (a), a groove is provided in the die 1 by the difference in filling grade, and a spacer 1 corresponding to the groove is attached to the feeder box 6, and linear partial raking is performed. was formed and compressed with a 70-lower punch as shown in Figure 2 (a) to obtain a green compact as shown in Figure 2 (b).However, according to this method, powder removal When the feeder moves, it only moves in a straight line, so its shape is limited.

This invention was made in view of the above circumstances, and when filling a mold with raw material powder, the powder is scraped along the outer periphery of the die on the upper side of the mold hole to eliminate partial steps. The purpose of this paper is to provide a method and apparatus for providing the same. Therefore, in the present invention, a spacer having two pins that are biased in the left and right directions and that slide and protrude downward is attached to the feeder box, and as the feeder box moves, the protruding portions of the pins move around the outer periphery of the mold hole. By sliding with the mold as a guide, the raw material powder on the outer periphery of the mold hole after filling is scattered.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 7. Figure 4 is a drawing of a spacer according to an embodiment of the present invention, and Figures 5 (A), (B), and (C) are explanatory diagrams of a powder bed filling method according to an embodiment of the present invention, @ Figure 6. (stomach)
, (b) and (c) are diagrams showing the shape of the target product manufactured by this method, and FIGS. 7(a) and (b) are diagrams showing one shape of the die used in the present invention. FIG. 4(A) is a plan view of the spacer of the present invention, and FIG. 4(B) is a sectional view taken along the line A-A in FIG. At the same time, the lower part is partially protruding.

This spacer 7 is attached to the feeder box 6 as shown in FIG. 5, and the moving bin 7a is attached as shown in FIG.
When the feeder box 6 moves forward over the die 1 from the state in which the protruding part of the movable bottle 7a is fitted into the relief 1b, the raw material powder is filled into the die hole as shown in FIG. When the feeder box 6 reaches the relief and the filling is completed, as shown in FIG. This creates a ring-shaped partial step such as 1C. Figure 6 (a), (b), (
C) shows the shape of the target product to which this invention is applied, 1c
is the part of the step. FIG. 7(A) is a plan view of the die used in this invention, and FIG.
Recesses 1b are provided before and after a.

As explained in detail above, in the past, when a step was formed on the top side of the die by partial fishing boat scraping, it could only be done in a straight line, but according to the present invention, when moving the feeder, the bottle in the spacer is pulled outward by a spring,
Since the bottle moves along the 8 surfaces inside the die, the part where the bottle has moved is scraped, so the boss, which was previously difficult to remove,
&sha of flange density difference, omission of product step processing, 2 steps) (
This has the effect of turning some of the parts into punches. Furthermore, the molded shape of a sintered part is largely determined by the die mechanism and is also restricted by the powder filling method, but this invention improves the powder filling method to improve the molded shape, which has traditionally been considered a strict requirement. This is effective in making it possible to mold a product with a more uniform density.

[Brief explanation of drawings]

Figure 1 (a) and (b) are explanatory diagrams of powder molding. If a step is provided, the 6th
Figures (a) and (b) show σ in the case of conventional linear scraping.
Figure 4 A) and (B) are structural diagrams of a spacer according to an embodiment of this invention, and Figures 5 (A), (B), and (C) are powder filling according to an embodiment of this invention σ). Explanatory diagram of the method, Figure 6 (a). (B) and (C) are diagrams showing the shape of the target product manufactured by this method, and FIGS. 7A and 7B are diagrams showing one shape of the die used in the present invention. 1... Die 1a... Mold hole 1b... Relief 1c... Step 6... Feeder box 7
・－・Sweet? -7a...Bottle 7b...Nokune agent Increased thickness Figure 2 Figure 3 Figure 4 (b) Figure 5

Claims (1)

[Claims] 1. When filling the raw material from the feeder box to the die,
A powder filling method characterized in that the protruding part of a bottle attached to a spacer is slid using the outer periphery of the hole as a guide, and raw material powder is scattered around the outer periphery of the mold hole after filling. 2 The feeder boxes are each biased in the left and right direction,
A spacer with two bottles that slides and protrudes to one side is provided, and the die is equipped with IMP. An ice powder optical filling device characterized in that it is configured to remove one raw material powder from the outer periphery of the mold hole after filling by providing relief of the bottle before and after the bottle.