JPH0777679B2 - Powder molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) In the present invention, in the production of tablets and molding for powder metallurgy, in particular, the shape of the molded product is large compared to its diameter,
It is an object of the present invention to provide a powder molding means capable of producing a product having a uniform density throughout when it is a complicated one such as a cap and having a simple structure and operation.

Conventionally, in the production of powder moldings, the powder is loaded on the lower kine which is inserted into the hole formed in the fixed bed, this powder is compressed by the upper kine, and then the lower kine is raised. It is usual to eject the compression molded product from the us hole. In this case, for example, a molded article having a smaller thickness than the diameter, such as a medicine or other tablet shown in FIG. 4 (a), has a relatively uniform internal density, but, for example, FIG. 4 (b).
As shown in FIG. 4 (c), the length is larger than the diameter like a rod-like object, or the density is very uneven as shown in the figure. The reason for this is that the frictional resistance of the powder particles is large and the fluidity is lacking, so that the powder is dense on the upper kine side that is stroked during the compression operation, and is coarse on the stationary lower kine side.
In order to eliminate such non-uniformity of the density, it is sufficient to perform the upward stroke of the lower kine during the downward stroke period of the upper kine. Therefore, in response to such a demand, conventionally, it is separate from the stroke drive system of the upper kine. A stroke drive system for the lower kine is installed in the upper kine and the lower kine is stroked together. As a result of installing such two drive systems, not only the mechanism is complicated and the device becomes large, but also the stroke timing and stroke amount of the upper kine and lower kine differ depending on the shape required for the molded product. It is necessary to provide it.
Therefore, in order to cope with this, in order to ensure the sequence operation with different stroke timing and stroke amount of the upper kinematics and the lower kinematics, a complicated mechanical or electrical control mechanism of both drive systems is added, and the molding device is extremely It was a big one. Therefore, it is a specific object of the present invention to eliminate the drawbacks of the prior art relating to the production of a powder molded product having a length longer than the diameter or having a complicated shape and having a uniform density.

(Structure of the Invention) Hereinafter, the present invention will be described with reference to the illustrated embodiments.
Is a base floor, 2 is an upper floor, 3 is a lower floor, and is fixed to the base floor 1 by side walls (not shown) of the upper floor 2 and the lower floor 3 devices.
The upper floor 2 has a us hole 21. A movable frame 4 is formed by connecting a head beam 41 for mounting the upper kinematics 81 and a foot beam 42 with vertical rods 43, 43. The movable frame 4 is, for example, an upper floor 2 and a lower floor as shown in the figure. It is vertically held by 3 and. 5 is a movable floor for mounting the lower kine 82, and pressure receiving blocks 31, 31
It is supported on the lower floor 3 via. Pressure receiving block 31,31
In some cases, the block may be an integral block having a constant height, but in the example shown in the figure, a pair of wedge-shaped blocks are stacked as shown in FIG. 2 and one of them is slidable so that the height can be adjusted. Has become. A movable frame drive device for vertically moving the movable frame 4 and a drive device for the discharge stroke of the lower kinematics 82 are provided. The movable frame drive device of the illustrated example is one fluid pressure cylinder 6, and the end of the cylinder 61 and the end of the piston rod 62 are fixed to the lower floor 3 and the leg 42 of the movable frame, respectively, and to both sides of the piston. By applying fluid pressure to one of the cylinder chambers, the piston rod expands and contracts, and the movable frame 4
Is driven up and down. When adopting such a movable frame drive device, lock nuts 44, 44 are screwed onto the vertical rods 43, 43 of the movable frame between the movable floor 5 and the lower floor 3,
The lock nuts 44, 44 constitute a drive device for the discharge stroke of the lower kinematics 82 described above. That is, by screwing the lock nuts 44, 44 to appropriate positions, the movable frame 4 can be moved up a large stroke to discharge the molded product produced by compressing the powder onto the upper floor 2. Of.

As another example of the movable frame drive device, although not shown, an eccentric cam device in which a passive cam is held and engaged with the movable frame 4 can be adopted. Such an eccentric cam device is usually provided at the position of the first fluid pressure cylinder 6 in FIG. 1, and one end of the passive cam is preferably connected to the central portion of the leg 42 of the movable frame by a ball joint. As a drive device for the discharge stroke of the lower kine 82 when such an eccentric cam device is adopted as a movable frame drive device,
For example, a hanging leg is provided on the movable frame 5 to allow it to freely penetrate the lower floor 3, and a cam is fixed to the drive shaft of the eccentric cam device, the cam surface of which is the lower end of the hanging leg which is a part of the movable floor 5. To be engaged with.

The device of the present invention is further provided with a drive device for the compression stroke of the lower kinematics 82. This compression stroke drive device includes a cylinder chamber of a first fluid cylinder 91 having a base floor 1 and a foot of a movable frame interposed between 42 and a second fluid pressure cylinder provided between a lower floor 3 and a movable floor 5. The cylinder chamber 92 is connected by a high pressure hose 93 as shown in the figure. The height of the first fluid pressure cylinder 91 must be adjustable, so that in the illustrated example, the body of the first fluid pressure cylinder 91 is mounted on a slider block 94 as shown in FIG. ing. The slider block 94 has two wedge-shaped upper and lower blocks as shown in the figure, the upper block 95 is connected to the base floor 1 via a link device 97, and the lower block 96 is 1 m.
It is screwed into the m pitch adjusting screw 98. With this design, the slider block can be rotated by one rotation of the adjusting screw 93.
The height of 94 can be changed by 4/100 mm. Incidentally, reference numeral 99 in FIG.
Is a fluid pressure generating pump, 100 is the second with the piston rod extended
This is an accumulator for returning operation of the fluid pressure cylinder 92.

Since the present invention is configured as described above, as shown in FIG. 1, the upper kine 81 is on the head 41 of the movable frame 4 and the lower kine 82 is on the movable floor 5.
Install on. The lower kinematics 82 must be at least partially inserted in the us hole 21. Molding raw material powder 21
When the operation is started by loading into the above, the movable frame 4 is vertically stroked by the movable frame driving device, and the powder supported by the lower kine 82 in the us hole 21 is compressed and molded by the lowering of the upper kine 81. It When compressed by the lowering of the upper kine 81, the density of the powder becomes particularly large on the side of the upper kine 81 and the lower kine 82
As described above, there is a significant difference in density from the side. By the way, according to the present invention, the device is provided with a drive device for the compression stroke of the lower kinematics 82, and this drive device for the compression stroke is provided with a base plate 1 and a movable frame so that the height can be adjusted. The cylinder chamber of the first fluid pressure cylinder 91 interposed between them and the cylinder chamber of the second fluid pressure cylinder 92 interposed between the lower floor 3 and the movable floor 5 are connected. Therefore, in the process of powder compression, the upper frame 81 and the movable frame 4
When the piston rod of the first fluid cylinder 91 receives a mechanical pressing force due to the falling 42, the piston rod of the second fluid pressure cylinder 92 expands and the movable floor 5 moves. , And as a result, an ascending stroke of the lower kinematics 82 occurs, and the powder is compressed under pressure toward the upper kinematics 81 which is descending. The end point of this pressure compression is the first fluid pressure cylinder
It is the bottom dead center of the 91 piston rod.

Further, according to the present invention, the lower kinematic material 82 as exemplified above is used.
Since the drive device for the discharge stroke is provided, when the piston rod of the first fluid pressure cylinder 91 reaches the bottom dead center, the movable frame 4 rolls to the upward stroke, so that the upper kinematics 81 moves from the us hole 21. As it escapes, the lower kinematics 82 continues its upward stroke, so the first fluid pressure cylinder
When the 91 piston rod reaches the bottom dead center, the molded product formed in the us hole 21 is discharged from the us hole 21.

By the way, in the molded product obtained here, the powder in the us hole 21 is the upper one.
Since it is formed by being pressed from both the lower kine and lower kine, the density of the powder particles is not biased to the upper kine side (upper) as shown in FIG. Like above, it is almost uniform in the whole area in the molded product.

Further, according to the present invention, since the height of the first fluid cylinder 91 can be adjusted, if the bottom dead center of the piston rod is changed by the adjustment, the bottom stroke of the lower stroke of the upper kinematics 81 is adjusted according to this change. Is changed so that the vertical dimension of the molding can be set as desired. In addition, according to the powder molding experiment, as the molded product is vertically long, the upward pressing start time is delayed with respect to the downward pressing start time and the upward pressing duration is shorter than the downward pressing duration. The shorter setting has a better effect on the density equalization, but
According to the present invention, since this is automatically achieved by adjusting the height of the first fluid pressure cylinder, a control device or the like for setting the timing and the duration of the start of the lifting stroke of the lower kine is added. No equipment is required.

(Effects of the Invention) That is, according to the present invention, not only is it possible to easily produce a vertically long molded product or a molded product having a complicated shape and having a uniform density throughout the molded product, Since the drive system of the lower kine and the lower kine are inseparably integrated, there is a single control device for them, so there is the convenience that the drive control is performed by a single operation, and the vertical dimension of the molded product is set. Also, since the stroke start timing and duration of the lower kinematics relative to the stroke of the upper kinematics are set by adjusting the height of the first fluid pressure cylinder, the device is simple and low-cost, and operability is improved. A very good powder molding device can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an essential part of an embodiment of the present invention, FIG. 2 is a side view of a pressure receiving block, FIG. 3 is a vertical sectional side view of an essential part of a slider block, and FIG. FIG. 5 is a vertical sectional view of a compression molded product, and FIG. 5 is a vertical sectional view of the molded product according to the present invention. 1 is a base floor, 2 is an upper floor, 21 is a us hole, 3 is a lower floor, 31 is a pressure receiving block, 4 is a movable frame, 41 is a head, 42 is a leg, 43 is a vertical rod, 44 is a lock nut, 5 Is a movable floor, 6 is a main fluid pressure cylinder, 61 is a cylinder, 62 is a piston rod, 81 is an upper kinematics, 82 is a lower kinematics, 91 is a first fluid pressure cylinder, 92 is a second fluid pressure cylinder, and 93 is a high pressure hose. , 94 is a slider block, 95 is an upper block, 96 is a lower block, 97 is a link device, 98 is an adjusting screw, 99 is a fluid pressure generating pump, and 100 is an accumulator.

Claims (3)

[Claims] 1. A base floor 1, an upper floor 2 fixed to the base floor and having a hole 21 formed therein, a lower floor 3 fixed to the base floor, a head pad 41 and a foot pad 42 for attaching an upper kine 81. A movable frame 4 which is connected to the vertical rods 43, 43 and is vertically guided and held by the upper floor 2 and the lower floor 3, and a movable floor for attaching the lower kinematics 82 supported by the lower floor 3 via the pressure receiving blocks 31, 31. 5, a movable frame driving device for vertically moving the movable frame 4, and a first fluid pressure cylinder 91 interposed between the base floor 1 and the foot 42 of the movable frame so that the height can be adjusted.
Drive unit for the compression stroke of the lower kine 82, which connects the cylinder chamber of the second fluid pressure cylinder 92 interposed between the lower floor 3 and the movable floor 5, and the drive for the discharge stroke of the lower kine 82. A powder molding device comprising a device. 2. The movable frame driving device as described above, wherein one of the cylinder 61 and the piston 62 is on the lower floor 13 and the other is the movable frame 4.
The drive device for the discharging stroke of the lower kinematics 82, which is composed of the main fluid pressure cylinder 6 fixed to the above, is the lock nuts 44,44 screwed to the vertical rods 43,43 of the movable rod between the movable floor 5 and the lower floor 3. The powder molding apparatus according to claim 1, which comprises: 3. The movable frame driving device comprises an eccentric cam device in which a passive cam is held and engaged with the movable frame 4, and the driving mechanism for the discharge stroke of the lower kinematics 82 is a cam on a part of the movable floor 5. The powder molding apparatus according to claim (1), which comprises a cam fixed to a drive shaft of the eccentric cam device so that the surfaces thereof can be engaged.