JPH07242907A - Shoe box for powder molding device - Google Patents

Abstract

PURPOSE:To uniformly pack raw material powder into a die cavity even in the case of producing green compacts having intricate shapes by correcting deviation in supply of the raw material powder. CONSTITUTION:A main body 21 of the shoe box 20 of a powder molding device for packing the raw material powder into the die cavity by sliding the upper surface of the die is provided with plural raw material charging pipes 22, 23 for charging the raw material powder so that the raw material powder can be dispesedly supplied. Further, the shoe box 20 is provided with the raw material charging pie 23 freely adjustably in position, by which the supply distribution of the raw material powder is made adjustable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shoe box of a powder molding apparatus used in a powder compacting process of powder metallurgy.

[0002]

2. Description of the Related Art FIG. 6 is a schematic view showing a state in which one step is carried out in a main part of a conventional powder molding apparatus. The die indicated by reference numeral 1 in the figure includes a die 2, a lower punch 3 mounted in a through hole of the die 2, and an upper punch 5 for compressing and molding the raw material powder P by descending into a die cavity 4. Become. On the upper surface of the die 2, a shoe box 7 that moves the raw material powder P into the die cavity 4 and pushes and moves the molded green compact 6 is moved forward and backward (arrow A is moved forward,
The arrow B indicates the backward direction), and the conveyor 8 for receiving the green compact 6 is arranged in front of the die 2.

The shoe box 7 has a box-shaped main body 9 that slides in a state where the lower surface is open and the lower surface is in contact with the upper surface of the die 2, and one raw material feeding pipe 10 fixedly provided on the main body 9. The raw material powder P charged from the raw material charging pipe 10 is filled in the die cavity 4 by being advanced and positioned on the die cavity 4 which is opened to the upper surface of the die 2.

In such a powder molding apparatus, when the green compact 6 molded by the die 1 is ejected by the lower punch 3, the shoe box 7 advances along the upper surface of the die 2 and the shoe box 7 moves. The green compact 6 is pushed and moved forward at the front end. When the shoe box 7 is further advanced, the raw material powder P charged into the shoe box 7 from the raw material charging pipe 10 is filled in the die cavity 4 of the mold 1, and the green compact 6 is placed on the conveyor 8. After that, when the shoe box 7 retracts to the standby position, the upper punch 5 descends again to form the green compact 6. Hereinafter, by repeating this, the green compact is molded one after another.

[0005]

By the way, in the conventional shoe box 7, since there is only one raw material feeding pipe 10 and it is fixed at a fixed position, the raw material powder P is likely to be biased, which is particularly complicated. In the case of manufacturing a green compact having a different shape, there is a problem that it is difficult to uniformly fill the die cavity 4 with the raw material powder P. Also,
There is a problem that it is difficult to arbitrarily adjust the supply balance of the raw material powder P in the die cavity 4 in the front, rear, left and right.

The present invention has been made in consideration of the above circumstances, and even if the uneven supply of the raw material powder is corrected and the green compact having a complicated shape is manufactured, the raw material powder is placed in the die cavity. The present invention aims to provide a shoe box of a powder molding apparatus in which the powder can be uniformly filled, and the fine adjustment of dimensions, density, cracks and the like can be easily performed by arbitrarily adjusting the balance of the raw material powder in the die cavity. .

[0007]

The shoe box according to the invention of claim 1 solves the above problem by providing a plurality of raw material feeding pipes in the main body of the shoe box.

A shoe box according to the invention of claim 2 is
The problem is solved by providing at least one of the plurality of raw material feeding pipes in the invention of claim 1 so as to be positionally adjustable with respect to the main body of the shoe box.

[0009]

In the invention of claim 1, the raw material powder is dispersedly charged into the main body of the shoe box from a plurality of raw material charging pipes,
Unbalanced supply of raw material powder to the die cavity is corrected.

According to the second aspect of the present invention, the raw material powder can be placed by positioning the raw material feeding pipe at a position where it is difficult to fill the raw material powder, and by doing so, the supply distribution of the raw material powder to the die cavity can be arbitrarily set. Can be adjusted to.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shoe box according to an embodiment of the present invention will be described below with reference to the drawings. The configuration of the parts other than the shoe box is the same as that of the conventional example of FIG. 6, and therefore the description thereof is omitted.

FIG. 1 is a top view of the shoe box 20, FIG.
Is a sectional view of the same. The body 21 of this shoe box 20
Consists of a rectangular box whose lower surface is open and other than the lower surface is surrounded by a wall. With the open lower surface in contact with the upper surface of a die not shown, it can be moved forward and backward along its length. It is like this. In FIG. 1, arrow A indicates the forward direction and arrow B indicates the backward direction.

The upper surface wall 21a of the main body 21 is provided with one fixed raw material feeding pipe 22 and two movable raw material feeding pipes 23. The fixed type raw material feeding pipe 22 has a main body 21.
It is fixed to the center of the rear portion of the upper wall 21a in a tilted posture. The fixed raw material feeding pipe 22 is made of a pipe having a large diameter, and the inside of the pipe communicates with the space inside the main body 21. In addition, the movable raw material feeding pipe 23 is made of a thinner pipe,
It is arranged on both left and right sides of the upper surface wall 21a so as to be movable back and forth.

Rectangular openings 24, which are long in the front-rear direction, are provided on both left and right sides of the upper wall 21a.
Further, guide rods 25 extending forward and backward along the opening 24 are arranged further outside thereof. Both ends of the guide rod 25 are bent downward so that the upper wall 21
By being fixed to a, the linear center portion is supported at a height slightly spaced from the upper surface wall 21a.
A moving member 26 that moves along the guide rod 25 is attached to the guide rod 25, and a movable raw material feeding pipe 23 is attached to the moving member 26, whereby the movable raw material feeding pipe 23 is mounted. However, while being guided by the guide rod 25, it can move in the front-rear direction.

The movable raw material feeding pipe 23 is held by the moving member 26 in a posture in which the front end portion is inclined obliquely downward, and the front end portion facing downward is inside the internal space of the main body 21 from each opening 24. Facing.

3 and 4 are views showing details of the mounting portion of the movable raw material feeding pipe 23. As shown in FIG. Movable raw material input pipe 2
The moving member 26 that supports 3 has a substantially semi-cylindrical shape (a cylindrical pipe is also possible) having a size that does not come off from the guide rod 25, and extends along the longitudinal direction of the guide rod 25 (direction of arrow D in FIG. 3). Not only can it be slid, but it can also be rotated in the circumferential direction (the direction of arrow E in FIG. 3) and can be fixed by the lock bolt 27 at any position. The movable raw material feeding pipe 23 is fixed by screwing a screw pin 28 protruding from the outer peripheral portion in the middle of the length direction into a screw hole 29 formed in an obliquely upper portion of the moving member 26 via a lock nut 30. 3, the screw pin 28 can be pivoted in the direction of arrow F in FIG.
By tightening so as to abut the outer peripheral wall of 6, it can be fixed at any position in the turning direction. Therefore, in addition to the position of the movable raw material feeding pipe 23 in the front-back direction, its inclination and posture can be freely changed.

The shoe box 20 constructed in this way
When using, as shown in FIG. 5, a pipe such as a flexible hose extended from the gate 33 of the raw material hopper 32 is connected to the respective upper ends of the fixed raw material feeding pipe 22 and the movable raw material feeding pipe 23. . In addition, each raw material input pipe 22, 2
3, a shutter may be provided in the middle of the pipe or the like to perform supply control including charging and blocking of the raw material powder.

Next, the operation will be described. As shown in FIG. 5, the shoe box 20 is provided with pipes, and each raw material feeding pipe 22,
When the raw material powder is charged into the main body 21 from 23, the raw material powder is dispersedly charged into the main body 21 from a plurality of places, so compared with the case where the raw material powder is charged only from the fixed type raw material charging pipe 22. As a result, the uneven supply of the raw material powder is corrected. Therefore, the raw material powder can be uniformly filled in the die cavity even when a green compact having a complicated shape is manufactured. In particular, since the shoe box 20 is provided with the movable raw material feeding pipe 23, the supply distribution of the raw material powder to the die cavity can be arbitrarily adjusted. Therefore, depending on the shape of the green compact and the like, by aligning the tip of the movable raw material feeding pipe 23 with a portion that is difficult to fill, the raw powder can be uniformly distributed in the die cavity regardless of the shape of the green compact. Can be filled.

In the above embodiment, the movable raw material feeding pipe 23 is manually moved and fixed, but it is also possible to provide a driving mechanism to automatically move the raw material feeding pipe 23.

[0020]

As described above, according to the shoe box of the invention of claim 1, since a plurality of raw material feeding pipes are provided, the raw material powder can be dispersedly charged into the main body of the shoe box. In addition, it is possible to correct the uneven supply of the raw material powder. Therefore, even when a green compact having a complicated shape is manufactured, the raw material powder can be uniformly filled in the die cavity, and the quality of the green compact can be improved.

According to the second aspect of the invention, at least one of the plurality of raw material feeding pipes is provided so that its position can be adjusted, so that the supply distribution of the raw material powder can be adjusted arbitrarily. Therefore, it is possible to adjust the feed distribution of the raw material powder according to the difference in the shape of the green compact, and even when manufacturing various types of green compacts of complicated shapes, the uneven distribution of the raw material powder Can be effectively corrected. Therefore, regardless of the shape of the green compact, the raw material powder can be uniformly filled in the die cavity, and the quality of the green compact and the fine adjustment of the size, density, cracks, etc. can be easily achieved.

[Brief description of drawings]

FIG. 1 is a top view of a shoe box according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a perspective view showing details of a mounting portion of a raw material feeding pipe whose position is freely adjustable in the shoe box of the embodiment.

4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a raw material supply system diagram showing the relationship between the shoe box and the raw material feeding hopper of the embodiment.

FIG. 6 is a schematic view showing a state of a main part of a powder molding apparatus having a conventional shoe box in one step of a molding operation.

[Explanation of symbols]

 2 dies 4 dies cavity 20 shoe box 21 main body 22 fixed raw material feeding pipe 23 movable raw material feeding pipe P raw material powder

Claims (2)

[Claims] 1. A box-shaped main body whose lower surface is opened and which is moved forward and backward with the lower surface in contact with the upper surface of a die,
A raw material feeding pipe provided in the main body for feeding the raw material powder is provided, and the raw material feeding pipe is fed by being advanced and positioned on a die cavity opened on the upper surface of the die. A shoe box of a powder molding apparatus for filling raw material powder into the die cavity, wherein a plurality of the raw material feeding pipes are provided in the main body. 2. The powder molding apparatus according to claim 1, wherein at least one of the plurality of raw material feeding pipes is provided so that its position can be adjusted with respect to the main body. Shoe box.