JPS6014734Y2 - Molded product extraction device for with-low-al type powder molding die set - Google Patents

Description

[Detailed explanation of the invention] This invention is a with-to-low type powder molding die set in which the die is lowered relative to the lower punch to extract the forming surface of the die hole. This invention relates to a molding surface extraction device for a withtroal type powder molding die set in which these die sets are individually assembled with steps.

The conventional molding surface extraction device for this type of powder molding die set mentioned above has a structure as shown in FIG.

That is, it has a sliding fork 101 pushed out by a spring on the upper surface of the fixed pressure plate 5, and the load that the lower outer punch 9 receives when pressurizing is received by the support surface at the tip of this sliding fork 101. .

Then, upon completion of the pressurization, the die 6 is lowered to the level of the upper surface of the lower outer punch 9, and by the time the die 6 completes its descent, the wedge 102 protrudes from the lower surface of the die 6.
The sliding fork 101 is moved by its roller 1.
03 and separates it from the lower outer punch 9, the lower outer punch 9 is further lowered until the upper surface of the lower inner punch 10 and the upper surface of the lower outer punch 9 coincide with each other. The forming surface P of the die hole 8 is extracted by relatively displacing the inner punch 10 upward.

In addition, FIG. 2 shows the state at the time of pressurization, and FIG. 3 shows the state at the time of extraction.

As can be understood from its configuration, this conventional molding surface extraction device has a problem when the height of the molding surface P is small relative to the pressurizing area.

That is, since separating the sliding fork 101 from the lower outer punch 9 must be completed within the downward stroke of the die 6, the smaller the downward stroke, the smaller the amount of movement of the sliding fork 101 will naturally become.

If the amount of movement of the sliding fork 101 is made small, the amount of engagement with the lower outer punch 9, that is, the supporting surface must also be made small, which poses problems in terms of strength.

Therefore, the present invention has decoupled the relationship between the downward stroke of the die and the support of the lower outer punch, and created a molded product extraction device that does not reduce the supporting force of the lower outer punch even if the downward stroke of the die is reduced. to provide,
To provide a molded product extraction device that can easily design a powder goose set that can obtain a molding technique with a small height dimension relative to the pressurized area, and that the upper end surface of all the lower punches is removed at the end of pressurization. The object of the present invention is to provide a molded product extraction device that is flush with the upper end surface of the die and that enables automatic operation of the pressurization cycle.

Next, the configuration of the present invention will be specifically explained with reference to embodiments shown in FIG. 4 and subsequent figures.

FIG. 4 shows a standby state in which the upper ram 1 and lower ram 2 of the press are at their respective rising ends, and the configuration will be described below with this state as a reference.

A base plate 3 is horizontally fixed to the lower ram 2 of the press, and an upper punch 4 is attached to the upper ram 1 of the press.

A pressure platen 5 fixed to the press bed is horizontally interposed between the base plate 3 and the upper punch 4.

A die 6 is further attached between the pressure plate 5 and the upper punch 4.

The die 6 and the base plate 3 are connected to each other by a guide bar 7, and can move up and down in synchronization with the up and down movement of the lower ram 2.

The guide bar 7 penetrates the pressure platen 5 as shown in the drawing.

Therefore, the pressure platen 5 and the guide bar 7 are in sliding contact.

The die 6 has a die hole 8 through which the upper punch 4 can fit.

The bottom of this die hole 8 is formed by the upper end surfaces of a lower outer punch 9 and a lower inner punch 10, which are arranged almost vertically between the pressure platen 5 and the die 6, and has no level difference as shown in the figure. ing.

The lower outer punch 9 has a cylindrical shape, and the outer periphery of the lower end bulges out like a flange.

The lower end surface thereof is connected to several bushing rods 11 inserted from the lower surface of the pressure platen 5.

A flange 12 is formed at the free end of the bushing rod 11, and upward sliding relative to the pressure platen 5 is controlled by this flange 12.
is regulated by contact with the lower surface of the pressure plate 5.

The end faces of the flanges 12 of these bushing rods 11 are normally pressed upward against the free end of a coil spring 13 mounted perpendicularly to the upper surface of the base plate 3 (see FIG. 4).

That is, each bushing rod 11 is pushed upward, and thereby the lower outer punch 9 is supported while being slightly raised from the upper surface of the pressure platen 5.

Note that, since a reinforcing plate 14 is attached to the center of the pressure plate 5, the lower end of the lower outer punch 9 is raised relative to this reinforcing plate 14.

At this time, the upper end of the lower outer punch 9 slightly protrudes into the die hole 8 of the die 6 from below.

A lower inner punch 10 is fitted into the hole of the lower outer punch 9 so as to be able to slide relative to the lower outer punch 9.

This lower inner punch 10 is attached to a mounting hole 15 formed in the pressure plate 5 with slight vertical sliding movement, and is prevented from being removed from the mounting hole 15 by a flange portion 16 at its base end.

A coil spring 17 built into the mounting hole 15
Normally, it is pressed upward by the spring force of

Note that downward sliding of the lower inner punch 10 is regulated by the base end of the lower inner punch 10 hitting the step 18 at the bottom of the step of the mounting hole 15 .

In this way, the lower inner punch 10 is connected to the coil spring 1.
7, the upper end surface of this lower inner punch 10 is slightly lower than the upper end surface of the lower outer punch 9 (see FIG. 4).

Note that the stroke S1 of the die 6 is approximately equal to the sum of the depth d of the die hole 3 to the upper end surface of the lower outer punch 9 and the lifting amount S2 of the lower outer punch 9, and also the lifting amount of the lower outer punch 9. The difference between the amount S2 and the lifting amount S3 of the lower inner punch 10 is set to be equal to the step in the plastic surgery.

Further, the spring force of the coil spring 17 is sufficient to extract the molding material P from the stepped portion of the die hole 8 formed by the lower outer punch 9 and the lower inner punch 10, and
When pressurized by the upper punch 4, the strength is set to be such that it bends due to molding pressure and lowers the lower inner punch 10 by S3.

9 and 10 show an example of a conventionally used powder supply mechanism, which is equipped with a powder supply shoe 21 that can move on the upper surface of the die 6, and the powder in the hopper 22 is weighed by a quantitative dropping device 23, and the flexible - Supplied via hose 24.

The powder supply shoe 21 is connected by a rod 26 to a hydraulic cylinder 25 provided on the same surface as the upper surface of the die 6, and slides on a rail 27.

Then, while upper punch 4 is rising, hopper 2
It moves from below 2 to above die hole 8, extrudes molding material P, supplies new powder, and returns below hopper 22.

Subsequently, the functions of the molded product extraction device for the powder molding die set having the above configuration will be explained mainly with reference to FIGS. 5 to 7.

When the die hole 8 is filled with metal powder in the state shown in FIG. 4 in which the upper ram 1 is at the rising end and the lower ram 2 is at the rising end, only the upper ram 1 is lowered as shown in FIG. The upper punch 4 enters the die hole 8.

Then, under the pressure of the upper punch 4, the lower outer punch 9 and the lower inner punch 10 are pushed down against the spring force of the coil springs 13 and 17, respectively.

At this time, the lower end surface of the lower outer punch 9 hits the reinforcing plate 14 on the upper surface of the pressure plate 5, and the lower inner punch 10
The lower end surface of the flange 16 abuts on the stepped portion 18 of the mounting hole 15, and further downward movement is restricted.

Then, when the upper ram 1 reaches the lower end, the metal powder in the die hole 8 is molded into the molding technique P.

When the molding is completed in this manner, only the lower ram 2 descends from the rising end to the descending end.

That is, the base plate 3 and the die 6 descend, and eventually the upper surface of the die 6 and the upper end surface of the lower outer punch 9 become flush with each other, and the molding technique P is almost removed from the die hole 8 as shown in FIG. , the upper punch 4 is held between the lower outer punch 9 and the lower inner punch 10.

At this time, the bushing rod 11 and the coil spring 13
The coil spring 13 becomes free.

When the lower ram 2 descends to the lower end in this manner, the upper ram 1 is then raised from the lower end to the upper end.

That is, as the upper punch 4 rises, the upper punch 4 is moved against the lower outer punch 9 and the lower inner punch 10.
The restraints by the lower inner punch 10 are released one after another, and the lower inner punch 10 is
It follows the rise of the upper punch 4 and rises to the rising end by the spring force of the coil spring 17.

However, the lower outer punch 9 remains lowered because the bushing rod 11 and the coil spring 13 are still separated.

Therefore, the upper end surface of the lower outer punch 9 and the upper end surface of the lower inner punch 10 eventually become flush with each other, and at the same time, the plastic surgery P is completely extracted (see FIG. 7).

The molding material P is thus pushed out laterally at the tip of the powder supply shoe 21 and removed from the gusset, as shown in FIG.

When the upper ram 1 reaches the rising end, the lower ram 2 rises to the rising end, the die hole 8 is again formed by the die 6 and the lower punches 9 and 10, and the powder is discharged from the powder supply shoe 21 as shown in FIG. After filling, all the members return to the initial state shown in FIG.

In the embodiment shown in FIG. 8, the end face of the lower outer punch 9 is lower in level than the lower inner punch 10, which is an inverse relationship to that of the previous example.

Therefore, in this embodiment, the lower outer punch 9 is a coil spring 1 having the same setting as the coil spring 17 in the previous example.
7A, and the lower inner punch 10 is loaded with a coil spring 13A via a bushing rod 11A.

Since the other configurations are almost the same as those of the previous example, the same reference numerals as those of the previous example will be used in the drawings, and their explanations will be omitted along with the description of their functions.

As is clear from the above description of the embodiments, the present invention has a fixed structure between the base plate attached to the lower ram of the press and the die that is connected to the base plate and has a die hole passing through it. The bottom of the die hole of the die has a pressure plate, and the upper end surfaces of a plurality of inner and outer lower punches, which are configured to be slidable relative to each other, are arranged in a step-like manner, and the die is arranged relative to the lower punches. A with-troal type powder molding die set that descends and extracts the molding technique of the die hole, in which the lower punch is suspended from the support surface by the spring force of a spring, and the upper end surface of the die set is lower than the lower punch of the highest level. This is a molded product extraction device in which the spring that floats the molded product has a spring force capable of extruding the molded product, so the molded product extraction can be performed by the spring force of the spring regardless of the stroke of the die.

Therefore, the lower punch can be configured so that it always hits a supporting surface such as a pressure plate that has sufficient strength and receives the load from the upper punch. Furthermore, when the pressure is finished, the upper end surfaces of all the lower punches become flush with the upper end surface of the die.
Extrusion for molding and the supply of new molding powder are performed continuously, making it possible to automatically operate the processing cycle.

[Brief explanation of the drawing]

FIGS. 1 to 3 are cross-sectional views of a conventional type of gusset and plastic surgery extractor, respectively, showing the process order. 4 to 7 and FIGS. 9 and 10 are longitudinal sectional views of the road body showing the plastic surgery extraction device of the present invention through the process together with the Guiset, and It is a longitudinal sectional front view of the road body showing another embodiment of the device according to Fig. 4. 1... Upper ram, 2... Lower ram, 4...
...Upper punch, 5...Pressure plate, 6...
...Dice, death...Dice hole, 9...
...Lower outer punch, 10...Lower inner punch, 13.17...Coil spring, P
・・・・・・Molding technique.

Claims (1)

[Scope of utility model registration request] A pressure plate fixed to the press bed is provided between a base plate attached to the lower ram of the press and a die connected to the base plate so as to be interlocked and has a die hole passing through it, and the bottom of the die hole is ,
The upper end surfaces of a plurality of inner and outer lower punches are configured to be slidable relative to each other and whose lower ends are supported by contacting the support surface of the pressure plate. In the withtroal type powder molding die set that extracts the molded surface of the hole,
A compression spring having a spring force capable of extracting the molded surface is inserted between the lower end surface of each of the lower punches and the support surface of the pressure plate or base plate, and upon completion of pressurization, the lower punches float up from the support surface below. A forming surface extraction device characterized in that, when the die is lowered to the lowest position, the upper end surfaces of all the lower punches form the same plane as the upper end surface of the die.