JP2898481B2 - Discharge method of compact in powder compression molding machine and apparatus used for the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing a compact from a powder compression molding machine used for powder metallurgy.

[0002]

2. Description of the Related Art In a powder compression molding machine of the type in which the dispensing of a molded product and the filling of the next raw material powder are carried out simultaneously, generally, FIG.
As shown in (c), once the molding is completed (i), the die c
Is lowered to the vicinity of the top surface of the lower punch a (ii), the molded body W in the mold is extracted, the lower end thereof is supported by the chamfered portion d of the die (iii), and the die c is raised as it is to the molding position. Filler box e held in upper and retracted positions
Is slid along the top surface of the die c onto the lower punch a (iv), and the molded body W is discharged out of the mold in the process of filling the material powder into the mold (v).

However, in such a method, when the compact W pressed by the filler box e is discharged out of the mold, the lower end corner is strongly pressed against the chamfered portion d, and as a result, this portion is chipped. Or other problems occur.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
It is an object of the present invention to provide a new dispensing method and a new dispensing method capable of surely dispensing a molded body outside a mold without damaging the molded body.

[0005]

That SUMMARY OF THE INVENTION The present invention is written
To achieve problem that, after compression forming of the raw material powder, the die
Raw material into the mold by the raw material powder filling means moving along the
Powder pressure that discharges the compact out of the mold while filling the powder
As a method of dispensing a compact in a compression molding machine, after compression molding of a raw material powder, first, at least one of a die and a lower punch is moved relatively to the other, and the compact is withdrawn slightly above the top surface of the die. And then the driving means
Activated and provided on the lower punch side end face of the raw material powder filling means
While pressing the extruded plate with a certain force, the molded body on the lower punch is slightly sent out onto the die, and finally, the die and the lower punch are returned to the molding position, and the raw material powder filling means is moved onto the lower punch. In addition, the raw material powder is filled in the mold, and the molded body is discharged from directly above the lower punch. As an apparatus used in this method, the top surface of the die has a lower punch. The die and the lower punch are configured to be relatively movable so that a position for extracting the molded body and a position for compression molding of the raw material powder can be taken to be located slightly below the top surface of the die. On the top surface, there is disposed raw material powder filling means which reciprocates between a position directly above the lower punch and a retreat position along the top surface, and a molding on the lower punch is provided on the lower punch side end face of the filling means. the extruded plate to feed some to on the dice , Driving for driving the pushing plate with a constant force
A moving means is provided .

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows each step of discharging a molded body according to one embodiment of the present invention, and FIGS. 2 and 3 are views showing an example of an apparatus used in this discharging method.

First , the entire structure of this apparatus will be described with reference to FIGS. 2 and 3. The powder compression molding machine is a single-pressing type, that is, a molding machine in which the lower punch 1 is fixed. The die 3 for compression-molding the compact W from the raw material powder together with the punch 2 is configured to be pulled down slightly below the top surface 1a of the lower punch 1 after molding, die-cut, and then pulled up again to the molding position. I have.

Reference numeral 5 denotes a filler box disposed on the top surface 3a of the die 3. The filler box 5 pays out the compact W out of the mold and fills the mold with the raw material powder contained therein. Thus, it is configured to be able to reciprocate between the retracted position and the position immediately above the lower punch 1.

The filler box 5 includes a lower punch 1
A frame 6 provided with guide holes 7, 7 is integrally fixed to a front surface 5 a on the side thereof, and here a molded body extruding plate 8 is provided via guide rods 9, 9 inserted into the guide holes 7, 7. The pushing plate 8 is attached to the end of a rod 11 of an air cylinder 10 fixed to the center of the front surface of the filler box 5 and is moved downward by the air cylinder 10 which operates when the die 3 is lowered. It is configured to be temporarily pushed onto the punch 1.

Next, a process of dispensing the compact W by the apparatus having the above-mentioned configuration will be described with reference to FIG. After the required compact W has been formed between the upper punch 2 and the lower punch 1 (I), the die 3 is then lowered slightly below the top surface 1a of the lower punch 1 and the upper punch 2 is raised. The molded body W is extracted from the mold (II). Then, in this state, the air cylinder 10 is operated to temporarily extrude the molded body extruding plate 8 to slightly send out the molded body W on the lower punch 1 to the die 3 (IV).

Next, the die 3 is raised again to the molding position, and the filler box 5 is moved to the lower punch 1.
Move up (V). As a result, the filler box 5 pays out the molded body W without adding any resistance to the molded body W, and at the same time, reaches the upper portion of the lower punch 1 to fill the raw material powder P contained therein into the mold (VI). ). When the above series of processing is completed, finally, the filler box 5 is retracted to the original retracted position, and the upper punch 2 is lowered again to move to the next molding operation (VII).

Although the present invention has been described above with reference to an embodiment applied to a single-press type molding machine, the present invention is also applicable to a double-press type, ie, an upper punch and a lower punch. The present invention can also be applied to a double-acting powder compression molding machine to be performed. As an operation of projecting the compact W slightly above the top surface 3a of the die 3, a means for raising the lower punch is employed. It is also possible.

[0013]

As described above, according to the present invention, the die and the lower punch are relatively moved so that the top surface of the die is located slightly below the top surface of the lower punch.
The molded body on the lower punch is slightly extruded onto a die by an extruding plate driving means provided on the end face of the lower punch 4 on the raw powder filling means , and the molded body is removed from the lower punch together with the operation of charging the raw material powder into the mold. So that the raw material is filled
By extruding the extruded plate with the means stopped,
By slightly moving while applying a constant force to the molded body without contacting a portion of the mold brittle molded body bonded to the surface of the lower punch during the compression molding was gently Shifts from the top of the lower punch Above, break it with the filling operation of the raw material powder
It is possible to greatly reduce the yield of this type of work by enabling the discharge without any waste.

[Brief description of the drawings]

FIGS. 1 (I) to (VII) are views showing each step of a method for dispensing a compact according to an embodiment of the present invention.

FIG. 2 is a side view showing an example of an apparatus used in the above method.

FIG. 3 is a plan view of the same device.

FIG. 4 is a view showing an example of a conventional compact discharging operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower punch 2 Upper punch 3 Die 5 Filler box 8 Extruded plate of molded object 10 Air cylinder W Molded object

Claims (2)

(57) [Claims] 1. After the raw material powder is formed by compression, it is moved along a die.
Filling the raw material powder into the mold by moving raw material powder filling means
To a powder compression molding machine that simultaneously discharges the compact out of the mold
In the method of dispensing the molded body in, after the compression molding of the raw material powder, first, at least one of the die and the lower punch is moved relatively to the other, and the molded body is withdrawn slightly above the top surface of the die. Activating the driving means, while pressing the extrusion plate provided on the lower punch side end face of the raw material powder filling means with a constant force, slightly sending out the molded body on the lower punch onto the die, and finally, the die and the lower punch are removed. After returning to the molding position, the raw material powder filling means is moved onto the lower punch so that the raw material powder is filled into the mold and the molded body is discharged from directly above the lower punch. Of dispensing a compact in a powder compression molding machine. 2. After the raw material powder is formed by compression, it is moved along a die.
Filling the raw material powder into the mold by moving raw material powder filling means
To a powder compression molding machine that simultaneously discharges the compact out of the mold
In addition, the die and the lower punch are combined so that the top of the die can be located at a position slightly lower than the top of the lower punch, and the position for extracting the compact can be taken as the compression molding position of the raw material powder. A material powder filling means that is configured to be relatively movable and that reciprocates between a position immediately above the lower punch and a retreat position along the top surface on the top surface of the die is provided. On the lower punch side end face of the filling means, an extruded plate for slightly feeding the molded body on the lower punch onto the die,
A device for dispensing a compact in a powder compression molding machine, comprising a driving means for driving the extruding plate with a constant force .