JPS6226878B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for finely adjusting the amount of filled powder in a powder forming press for forming iron powder, copper powder, other ferrite, and ceramic powder materials.

Generally, a floating die type press is often used as the powder compacting press.
In powder filling in this type of powder forming press, the filling depth is determined by the rising height of the lower ram of the press, that is, the height at which the die is lifted from the height of the die at the time of extrusion. After filling the powder into the space (die cavity) surrounded by the die and lower punch,
The next step is compression molding using an upper punch.

However, since the raw material for molding in this type of press is powder, and although the raw material is filled into the die cavity using a volume control method, the apparent density (bulk specific gravity) of the powder is not uniform, which causes the weight of the molded product to vary. Some variation in dimensions occurs. Therefore, for products where this variation cannot be tolerated, the dimensions and weight of the molded product are automatically measured using a measuring means, and the press is pressed so that the dimensions, etc. are within the specified range. Adjustment measures are taken to automatically follow the filling depth.

However, if a normal press filling adjustment device is directly used as the adjustment means, it is difficult to provide instantaneous response due to the large mass of the moving parts, and moreover, a high-output drive motor is required.
There were problems with large-scale presses, such as the fact that they were quite expensive.

In view of these points, it is an object of the present invention to provide a device for finely adjusting the amount of packed powder in a powder forming press, which allows finely adjusting the amount of raw material powder filled with an extremely simple configuration.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 is a frame that is a part of the press body, and a fixed plate 2 is placed and fixed on the frame 1, and a lower punch 3 is attached to the upper center of the fixed plate 2. has been done. A die plate 5 is disposed above the fixed plate 2 and has a die 4 in the center thereof into which the lower punch 3 is inserted. An upper punch plate 6 that moves up and down together is disposed, and an upper punch 7 is mounted on the lower surface of the upper punch plate 6.

A plurality of guide rods 8 are installed on the upper surface of the die plate 5, and the guide rods 8 extend upwardly through the upper punch plate 6 to guide the vertical movement of the upper punch plate 6. .

Further, an extrusion plate 9 that engages with a lower press ram (not shown) is disposed below the fixed plate 2, and this extrusion plate 9 has a plurality of rods extending upward through the fixed plate 2. The base end of a connecting rod 10 is attached, and the die plate 5 is connected to the top end of this connecting rod 10. Further, a core rod 11 is attached to the center of the extrusion plate 9 so as to be vertically adjustable, passing through the fixed plate 2 and the lower punch 3, extending upward, and having an upper end protruding into the die 4.

On the other hand, a plurality of pneumatic cylinders 12 (only one is shown in the figure) are fixed to the outside of the fixed plate 2, and a support member 14 is attached to the piston rod 13 of the pneumatic cylinders 12.
is attached to the lower surface of the connecting piece 15 protruding from the outside of the extrusion plate 9.

That is, FIG. 2 is an enlarged vertical sectional view of the pneumatic cylinder 12 and the support member 14, in which the cylinder portion of the pneumatic cylinder 12 is attached to the fixed plate 2.
A piston rod 13 is fixed to the outside of the extrusion plate 9 and is fixed to a piston 16 which is slidably housed in the cylinder. A threaded portion 13a is provided at the lower end of the piston rod 13 and extends to an appropriate height. A worm wheel 17 rotatably disposed is screwed together with the worm wheel 17, and a worm 18 driven by an appropriate drive mechanism (not shown) is meshed with the worm wheel 17. In addition, the code|symbol 19 is a cover which covers the threaded part 13a.

By the way, on the inner surface of the cylinder top wall of the pneumatic cylinder 12, a male threaded member 20 is protruded at the center thereof. 21 are screwed together, and the stopper 21
The gear-shaped portion 21a includes a gear 23 provided at the lower end of a drive shaft 22 that passes through the top wall of the cylinder and is driven by a pulse motor (not shown) as appropriate.
are interlocked. Further, an air supply port 23 that opens into the piston lower chamber 12a of the pneumatic cylinder 12 has an air supply pipe 25 connected to a receiver tank 24 to which pressurized air is supplied from an air source.
The air supply port 26, which penetrates the cylinder top wall and the male threaded member 20 and opens into the piston upper space 12b, connects to the receiver tank 24 via a switching piece 27 and a regulator 28.
It is connected to the.

1 and 2 show the powder filling position, in which the die plate 5 and core rod 11 are moved upward to a predetermined filling height position by the extrusion plate 9, and the die 4, lower punch 3 and core rod 11 are moved upwardly by the extrusion plate 9. The cavity thus formed is filled with powder. In this case, the piston lower chamber 12a of the pneumatic cylinder 12 communicates with the receiver tank 24 via the air supply pipe 25, and an upward lifting force is applied to the piston 16 by the pressurized air.
On the other hand, the piston upper chamber 12b communicates with the atmosphere via a switching valve 27. Thus, the piston 16 has moved upward to the position where it comes into contact with the lower end surface of the stopper 21, and the die plate 5 is moved through the support member 14 attached to the piston rod 13, the connecting piece 15, the extrusion plate 9, and the connecting rod 10. is held at a predetermined height.

When the filling of the powder into the cavity formed by the die 4 and the like is completed in this way, the upper punch 7 is pressed down together with the upper punch plate 6 to perform compression molding of the powder, and then, upon completion of pressurization. The upper punch 7 is raised, and the next step is a so-called extrusion process in which the extrusion plate 9 is lowered to push down the die 4 and extrude the molded product. By the way, in the section where the extrusion stroke starts from the completion of the above-mentioned processing, the switching valve 27 is switched and the pressure air adjusted appropriately by the regulator 28 is supplied to the piston upper chamber 12b, and the piston 1
The pressure balance between the upper and lower surfaces of the die 6 is maintained, and the piston 16 is moved downward together with the extrusion plate 9 while the die 4 is prevented from floating during the extrusion process of the molded product (as shown by the two-dot chain line in FIG. 2).

When the extrusion of the molded product is completed, the molded product is discharged by the tip of a feeder (not shown), and then the switching valve 27 is switched to transfer the molded product to the piston upper chamber 12b.
The pressurized air inside is exhausted to the atmosphere. Therefore, the piston 16 is pushed upward by the pressure air in the piston lower chamber 12a, and the stopper 2
The die plate 5 stops at the upper limit position where it comes into contact with the die plate 1, and along with this, the die plate 5 is set again to the filling height position via the extrusion plate 9 and the like.

By the way, when changing the filling height due to changes in the dimensions of the molded product, the support member 14 is moved upward or upward along the piston rod 13 by operating the worm 18 and rotating the worm wheel 17. By adjusting the downward movement, the position of the die plate 5 relative to the piston 16 via the extrusion plate 9 can be changed and the filling height can be adjusted.

On the other hand, during continuous molding operations, if the dimensions or weight of the molded product change due to variations in the apparent density of the powder, a pulse motor (not shown) is activated in response to the amount of change in dimensions or weight. Therefore, the drive shaft 22 is rotated. Therefore, gear 2
3, the stopper 21 is rotated through the male threaded member 20, and the stopper 21 is moved upward or downward to adjust its position, whereby the upper limit position of the piston 16 is adjusted. minute adjustments are made. Thus, the filling height is adjusted in response to changes in powder density, etc., and the dimensions or weight of the molded product are always controlled to be within the permissible range.

In the above embodiment, the pneumatic cylinder supporting the die plate is provided with a stopper capable of vertical movement adjustment, but the present invention can also be applied to a floating plate such as an intermediate plate.

As explained above, in the present invention, the end wall of the pneumatic cylinder that supports the floating plate and raises the floating plate to a predetermined powder filling position comes into contact with the piston during powder filling, and the end wall of the pneumatic cylinder supports the floating plate and raises the floating plate to a predetermined powder filling position. Since a vertically adjustable stopper is provided to regulate the powder density, the filling height and therefore the filling amount can be adjusted by simply adjusting the height position of the stopper according to changes in powder density, etc. The dimensions and weight of the product can always be kept within tolerance, and there is no need to directly control the movement of heavy movable parts such as die plates and extrusion plates, so it can be used in an extremely short period of time during continuous molding operations. The filling height can be controlled within the tank using a small-output motor, and the product management can be carried out satisfactorily without increasing costs.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a die set of a powder forming press according to the present invention, and FIG. 2 is a vertical cross-sectional view of a packed powder micro-adjustment device according to the present invention. 2... Fixed plate, 3... Lower punch, 4...
Die, 5...Die plate, 9...Extrusion plate, 12...Pneumatic cylinder, 13...Piston rod, 14...Support member, 16...Piston,
21... Stoppa.

Claims (1)

[Scope of Claims] 1. The end wall of the pneumatic cylinder that supports the floating plate and raises the floating plate to a predetermined powder filling position has upper and lower parts that come into contact with the piston during powder filling and regulate its rising position. A device for finely adjusting the amount of packed powder in a powder forming press, characterized by having a dynamically adjustable stopper. 2. The device for finely adjusting the amount of packed powder in a powder forming press according to claim 1, wherein the stopper is vertically adjusted by a drive shaft passing through the end wall of the pneumatic cylinder. 3. Powder molding according to claim 2, wherein the stopper is a threaded member that moves up and down by being rotated by a drive shaft that extends through the end wall of the pneumatic cylinder. Filled powder micro-adjustment device in press. 4. The device for finely adjusting the amount of packed powder in a powder forming press according to claim 1, wherein the floating plate is a die plate. 5. The device for finely adjusting the amount of packed powder in a powder forming press according to claim 1, wherein the floating plate is an intermediate plate.