JPS61201704A - Powder molding method - Google Patents

Abstract

PURPOSE:To obtain easily a molding having a recess in the direction perpendicular to a pressurizing direction by providing a movable mold having a projecting part to a female mold, molding powder along the projecting part in the stage of pressurizing and moving the movable mold in the stage of taking out. CONSTITUTION:The raw material powder is packed into the female mold 14 and is compressively molded by moving an upper male mold 10 and a lower male mold 12 toward the center of the mold 14. The projecting part 20 of the mold 16 projects toward the inside of the mold 14 and the molding is executed along such projecting part. The mold 16 rotates and the projecting part 20 is contained in the mold 14 so that the notched surface 22 of the mold 16 forms the surface flush with the growing surface of the mold 14. the mold 10 moves upward and a lead wire 6 is drawn out. The mold 10 and the mold 12 move upward and the molding 14 is taken out. The lead wire 6 is cut in a suitable position and the molding 4 is transferred.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in a method for molding powder, and particularly to a method for molding a molded body having a recessed portion in a direction perpendicular to the direction in which the powder is pressed.

The powder molding method of the present invention can be used for manufacturing carbon products such as electric brushes, manufacturing machine parts using sintered metal, molding ceramic products, etc.

[Prior art]

In powder molding, a molded body having depressions or protrusions parallel to the pressing direction can be easily molded by providing corresponding protrusions or depressions in a male mold. However, a molded article having a recessed portion perpendicular to the pressing direction cannot be taken out from the mold if a protrusion corresponding to the female mold is provided.

Therefore, in order to produce a molded article having such a concave shape, the concave portion was usually formed by cutting.

[Purpose of the invention]

The object of the powder molding method of the present invention is to make it possible to manufacture a molded body having a recessed portion in a direction perpendicular to the pressing direction.

[Structure of the invention]

In the powder molding method of the present invention, a movable mold having a protrusion is movably provided in the female mold, molding is performed along the protrusion during pressurization, and the movable mold is moved during removal to take out the molded product. It is characterized by making it possible.

The types of movement of the movable mold include rotation, sliding, and back and forth movement relative to the female mold. Further, the movement mechanism includes a cam mechanism, a hydraulic mechanism, etc. that operate in accordance with the male type.

〔Example〕

An example will be described below using the molding of an electric brush as an example using the rotation and sliding of a movable mold, but the present invention is not limited thereto.

Figure 1 (a) shows the molding of the electric brush (2) shown in Figure 2.
This is explained by b). This electric brush (2) is made of a rectangular parallelepiped molded body (4) of graphite or a mixture of graphite and copper.
A lead wire (6) made of twisted braided wire of copper or the like is fixed, and the negative side of the molded body (4) has an arc-shaped recess (8).
is provided.

Returning to FIG. 1(a), α1 is an upwardly moving type, (a) is an upwardly moving type, and the upwardly moving type αO is provided with a through hole for passing a lead wire (6). The female mold ◇→ is provided with a movable mold 0Q, which can be rotated using a connecting rod connected to a cam mechanism (not shown). (1) is a movable αQ
The protrusion in (A) is the corresponding notch.

First, the first male mold Q1 stands still at the top of the female mold α, leaving a gap large enough to fill with raw material powder, and the lead wire (6) is pulled out by a predetermined length. When the filling of the raw material powder is completed, the advancing mold α1 and the advancing mold (2) move toward the center of the female mold α→, and compression molding is performed. At this time, the protruding member of the movable mold αQ protrudes into the female mold α→, and molding is performed along this. Here, molding was performed using a double-pressing method, but other molding methods such as a single-pressing method may be used.

When the pressurization is finished, the state moves to Fig. 1 (b), the movable mold QQ rotates, the protruding member is accommodated inside the female mold α, and the notch surface (A) of the movable mold α is inserted into the female mold α→. Forms flush with the molding surface. Further, the upward movement type α1 moves upward and the lead wire (6) is pulled out. Furthermore, the upward movement mold α1 and the upward movement mold (A) move upward, and the molded body (4) is taken out. Next, the lead wire (6) is cut at an appropriate position, and the molded product (4) is transferred by a pusher (not shown) or the like. Finally, the upward mold @ returns and moves on to the next molding.

Triangular depression (to) in the molded body (b) shown in Figure 4
Figure 3 (a) and (b) show the formation of the electric brush (a) equipped with
This is explained by: As shown in FIG. 3(b), the movable mold is provided with a protrusion (7) corresponding to the recess (to),
It is made slidable by a hydraulic mechanism (not shown) via a connecting rod. When pressurizing, molding is performed by causing the protrusion to protrude onto the molding surface of the female mold 0, as shown in Figure 3 (a), and when taking out the mold, the mold is moved (as shown in Figure 3 (b)).
Slide it on your right hand to form the molding surface of the female mold α → and the movable mold)
The flat surfaces (52) of the molded body (goods) can be taken out so that they form the same plane. In other respects, Figure 1 (
This is equivalent to the embodiments a) and (b).

In addition, in these embodiments, molding can be performed in the same way even if the movable molds 0e and (g) are moved backward.

〔Effect of the invention〕

With the powder molding method of the present invention, a molded body having a recessed portion in a direction perpendicular to the pressing direction can be easily molded.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are a sectional view and a partial sectional view showing the powder molding method of the example, respectively, and FIG. 2 is a perspective view of an electric brush molded by the method of the example. FIG. 3(a) is a sectional view showing another embodiment, FIG. 3(b) is a perspective view of a movable type used in the embodiment of FIG. 3(a), and FIG. 4 is the same as FIG. 3(a). FIG. 2 is a perspective view of an electric brush molded by the method of the embodiment. In the figure, 00...Upward type, (2)...Upward type, α
→...Female type, α・, ■...Movable type, (
b) 9 wheels... protrusion, (4) tc341...
Molded object. Utility model registration applicant Fuji Kako Co., Ltd. No. 111 (
a) Figure 1 (b) Figure 2m Figure 4

Claims (1)

[Claims] (1) A pressurizing step in which the powder filled in the female mold is pressed by upper and lower male molds to form a molded body, and a removal step in which at least one of the male molds is moved to take out the molded body from the female mold. In the powder molding method, the female mold is provided with a movable mold having a protrusion so as to be movable relative to the female mold, and in the pressurizing step, the powder is molded along the protrusion of the movable mold, A powder molding method, characterized in that in the taking-out step, the protruding part of the movable mold is moved into the female mold to enable taking out of the molded body.