JPH11291096A - Discharge device for green compact - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly carry out work to pack raw material powder by rapidly discharging a green compact cooperatively with ascending of an upper punch. SOLUTION: Both right and left side parts before and behind a die hole 1 atop a die 1 are provided with a first roller 9 rotatable around a perpendicular axis and a second roller 11 rotatable around a horizontal axis, respectively. A pair of right and left flexible ropes 12 having an equal length are respectively wound around the first and second rollers 9, 11 lining up back and forth on both right and left sides with the end on the first roller 9 side faced inward and the end on the second roller 11 side faced upward. The rear ends of the respective ropes 12 are connected to a ram 4 liftable toward the die hole 2 and likewise the front ends thereof are connected to pushing members 14 interlocked via pulling means 16 to a powder feed box 6 in such a manner that these ends exist in front of the die hole 2 when a punch 5 exists at an upper limit position and exist behind the die hole 2 when the punch exists likewise at a lower limit position, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge device capable of rapidly discharging a green compact formed by a compression molding machine in front of a die.

[0002]

2. Description of the Related Art A sintered metal product is formed into a product by pressing a raw material powder with a compression molding machine to form a compact and then firing it in a sintering furnace.

FIGS. 8 and 9 schematically show a main part of a compression molding machine for molding a green compact, in which a die hole (2) formed in a die (1) is provided. And a lower punch (3) are slidably fitted. An upper punch (5) is provided at the lower end of the ram (4) provided above the die (1) so as to be able to move up and down into the mold hole (2).

On the upper surface of the die (1), a powder feeding box (6) in which raw material powder is stored is mounted so as to be able to reciprocate in the front-rear direction (hereinafter referred to as left in the figure). This is 1
The mold hole (2) is filled with a required amount of the raw material powder every time it reciprocates.

When the upper portion of the lower punch (3) in the mold cavity (2) is filled with the raw material powder, the upper punch (5) is lowered together with the ram (4) as shown in FIG. Is pressed strongly with the lower punch (3) to form a green compact (7).

[0006] As shown in FIG. 9, the green compact (7) after molding is temporarily lowered by the entire die (1) being lowered, so that the mold cavity (2) is temporarily removed.
After being released from the inside onto the die surface, the upper punch (5) is lifted and simultaneously pressed by the tip of the powder feeding box (6) which is advanced and discharged forward.

After that, the die (1) rises and returns to the original position, and at the same time, the next new raw material powder is filled into the mold cavity (2) by the powder supply box (6).

[0008]

The green compact after the above-mentioned molding
When the mold (7) is released from the mold hole (2), especially when the green compact (7) is thin, as shown in FIG. Compacted by punches (3) and (5)
It is common to remove the mold while holding (7). As a result, a delay occurs in raising the upper punch (5).

Therefore, as described above, when the green compact (7) after demolding is to be discharged by advancing the powder box (6), the powder box (6) is moved upward with the upper punch (5). Because of the possibility of interference, the feed box (6) must be advanced after waiting for the rise, and the work of filling the next new raw material powder will be delayed, which may cause a decrease in productivity. ing.

[0010] The present invention has been made in view of the above-mentioned problems, and quickly discharges the green compact in conjunction with the rise of the upper punch, thereby quickly performing the work of filling the raw material powder and improving productivity. It is an object of the present invention to provide an apparatus for discharging a green compact.

[0011]

According to the present invention, the above-mentioned problem is solved as follows. (1) A discharge device for discharging a green compact formed in a die hole of a die and released on a die surface to the front of the die hole, the front and rear of the die hole on the upper surface of the die. A first roller rotatable about a vertical axis and a second roller rotatable about a horizontal axis are provided on both left and right sides of
A pair of left and right flexible ropes having the same length are attached to the first and second rollers arranged in front and rear on both right and left sides, respectively, with the end on the first roller side facing inward and the end on the second roller side. While winding each with the upward facing, the rear end of each rope is on a ram or a punch that can move up and down toward the mold hole, and the front end is also located in front of the mold hole when the punch is at the upper limit position, When the extrusion member is connected to the powder feeding box via a pulling means so as to be located behind the mold hole when also located at the lower limit,
Connect each.

(2) In the above item (1), the central portion of the extruding member is curved backward so as to be able to fit a part of the outer peripheral surface on the rear side of the green compact.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. The same members as those in the conventional example described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 and FIG. 2 show an initial state before starting green compaction, that is, before operating a compression molding machine.
A first grooved roller (9) is rotatable on a pair of support pins (8) and (8) which are provided upright on both left and right sides in front of the mold hole (2) on the upper surface of (1). Is pivoted to.

A pair of upwardly bolted bolts are mounted on the left and right sides of the front end of the powder feeding box (6) located behind the mold hole (2) on the upper surface of the die (1) and at the rear end. Bracket
(10) Each of (10) has a second grooved roller (11) pivoted about a horizontal axis.

The distance between the front first grooved rollers (9) and (9) and the rear second grooved rollers (11) and (11) in the left-right direction are substantially equal.

First and second grooved rollers (9) arranged in front and rear
(11) A pair of left and right flexible wires of equal length (12)
Has an end facing the first grooved roller (9) facing inward, and
Each is wound with the end on the side of the grooved roller (11) facing upward.

The upper ends of the left and right wires (12) wound on the second grooved roller (11) are respectively fixed to the left and right side surfaces of the ram (4) located at the upper limit. 13) Connected to.

Each end of the wire (12) wound on the front first grooved roller (9) is connected to the left and right ends of a substantially arcuate extrusion plate (14) curved backward in an arc shape. Connected to the end. The radius of curvature of the extruded plate (14) is
It is slightly larger than the radius of (7).

A tension coil spring is attached to a locking piece (15) formed at the center of the rear surface of the pushing plate (14) and at the center of the front surface of the powder feeding box (6).
Both ends of (16) are hooked. This allows the extruded plate (1
4) is always pulled backward to prevent slack in each wire (12) and to position the extruded plate (14) substantially at the center of the die (1) in the left-right direction.

The length of each of the left and right wires (12) is set so that the extruded plate (14) waits immediately before the mold hole (2) before the compacting is started. The first and second grooved rollers (9) and (11), the wire (12), the extruded plate (14), and the tension coil spring (16) constitute a discharging device.

Next, the operation of the above embodiment will be described with reference to FIGS. FIG. 3 shows a step of filling the raw material powder. From the initial state of FIGS.
By advancing to just above (2), the required amount of raw material powder (7 ') is filled in the mold cavity (2).

In this filling step, since the powder feeding box (6) simply moves forward by contracting the tension coil spring (16), no force acts on the wire (12) and the extruding plate (14) Is almost in its original position.

Then, after filling the raw material powder (7 '),
When (6) is retracted to the rear limit position (the position shown in FIG. 1), the process proceeds to the step of forming the green compact (7) shown in FIG.

In this step, when the upper punch (5) starts descending together with the ram (4), the vertical dimension between the second grooved roller (11) and the stopper (13) gradually decreases. There is a surplus in the length of the wire (12).

However, the pushing plate (14), which is always pulled backward by the tension coil spring (16), forms an excess wire (12).
To move backwards while pulling the wire (1
2) No sag occurs. When the upper punch (5) descends to the lower limit position and enters the mold hole (2) and the green compact (7) is formed, the second grooved roller (11) and the stopper (13) are connected. The distance between them is minimized and the extrusion plate (14) moves to the rear of the mold cavity (2).

Then, as shown in FIG. 5, when the die (1) is lowered to a position which is at the same height as the upper surface of the lower punch (3), the green compact (7) after molding is moved to the upper and lower punches (3). ) While being clamped by (5), it is released from the mold hole (2). At this time, the die
When (1) is lowered, the dimension between the second grooved roller (11) and the stopper (13) is slightly increased, and the wire (12) is pulled by that much. Moves slightly forward from the position shown in FIG. 4 against the tension coil spring (16).

From this state, the upper punch together with the ram (4)
When (5) is raised to the upper limit position, as shown in FIGS. 6 and 7, the wire (12) is greatly pulled by the ram (4), and at the same time, the push plate (14) is largely moved forward.
As a result, the green compact (7) is formed by the extruded plate (14) and the die
Is discharged forward.

At about the same time as the extruding plate (14) moves forward, the powder supply box (6) advances to just above the mold cavity (2) to fill with the next new raw material powder.

After that, when the die (1) rises to the original position shown in FIG. 3 and the raw material powder is filled in the mold cavity (2), the next new process is performed through the steps shown in FIGS. The green compact (7) is molded and discharged.

By repeating this process, a green compact
The forming and discharging of (7) are performed continuously.

As described above, in the above embodiment, the raising and lowering movement of the ram (4) is controlled by the first and second grooved rollers.
(9) By means of (11) and the wire (12) wound therearound, the extruded plate (14) is transmitted to the extruded plate (14) as horizontal motion, and the extruded plate (14) is moved forward in conjunction with the rise of the ram (4). To the green compact
(7) is discharged, so that the powder feeding box (6) and the upper punch (5) are separated from each other as in the conventional apparatus for discharging the green compact (7) by advancing the powder feeding box (6). There is no risk of interference. Therefore, at the same time as the upper punch (5) rises, the feeding box
(6) can be advanced, and the work of filling the raw material powder can be speeded up.

According to the present invention, the die (1)
Is applied to a compression molding machine in which the green compact (7) is removed by the lower punch (3). sell.

Further, it is needless to say that the present invention can also be applied to a compression molding machine in which the green compact (7) is large or thick and does not need to be clamped by the upper and lower punches (3) and (5) and demolded. .

[0035]

According to the present invention, the green compact can be quickly discharged in conjunction with the raising of the ram or upper punch, so that the waiting time when the powder feeding box is advanced is reduced, and the filling of the raw material powder is performed. Speeding up work can increase productivity.

Also, since the discharge is performed by using the lifting / lowering force of the ram or the upper punch, there is no need for any dynamic discharge means.
It can be implemented very cheaply.

According to the second aspect of the present invention, the compact can be held and discharged stably in a certain direction.

[Brief description of the drawings]

FIG. 1 is a side view of an essential part showing an initial state before compacting in a compression molding machine to which the present invention is applied.

FIG. 2 is a plan view along the line II-II in FIG.

FIG. 3 is a side view showing a filling step of the raw material powder.

FIG. 4 is a side view showing a molding step of the compact.

FIG. 5 is a side view showing a demolding step of the compact.

FIG. 6 is a side view showing a step of discharging the compact.

FIG. 7 is a plan view along the line VII-VII in FIG. 6;

FIG. 8 is a side view showing a molding step of a compact in a conventional example.

FIG. 9 is a side view showing the steps of demolding and discharging the green compact.

[Explanation of symbols]

 (1) Die (2) Mold hole (3) Lower punch (4) Ram (5) Upper punch (6) Powder box (7) Green compact (7 ') Raw material powder (8) Support pin (vertical axis) (9) First grooved roller (10) Bracket (11) Second grooved roller (12) Wire (cable) (13) Stopper (14) Extruded plate (15) Locking piece (16) Tension coil spring (Tensile means)

Claims (2)

[Claims] 1. A discharge device for discharging a green compact formed in a die hole of a die and released on a die surface to the front of the die hole, the discharge device being provided in front of the die hole on an upper surface of the die. A first roller rotatable about a vertical axis on each of the left and right sides of the rear and
A second roller rotatable about a horizontal axis is provided, and a pair of left and right flexible ropes having the same length are attached to the first and second rollers arranged front and rear on both left and right ends, respectively, at the end of the first roller. Part inward and the end on the second roller side is wound upward, and the rear end of each rope is pierced by a ram or a punch that can move up and down toward the die hole. Is located in front of the mold hole when it is at the upper limit position, and is connected to the extruding members linked to the powder feeding box via pulling means so as to be located behind the mold hole when it is also located at the lower limit. Discharge device for the compact. 2. The apparatus for discharging a green compact according to claim 1, wherein a central portion of the extruding member is curved backward so as to have a size in which a part of an outer peripheral surface on a rear side of the green compact can be fitted.