JPH02274396A - Method and device for rapping of hot press molding machine - Google Patents

Abstract

PURPOSE:To execute a sure rapping by parting a die, etc., upward from a 2nd punch after a compression molding, and then mounting the die to a 2nd punch via a spacer to press a molding downward with a 1st punch. CONSTITUTION:The pressurization operation by a press ram 6 is stopped after the press molding of a sample. The die 2, the punch 3 and the molding are then integrally moved by a transfer means 11 and are parted from the punch 4. After a buffer member 13 and the spacer 12 are mounted to the base body 4b of the punch 4, the die 2 is imposed on the spacer 12 and the punch 3 is pushed down. Since the fitting surface of a tapered sleeve 8 and the die 2 are gradually increased in diameter toward the lower side, the above-mentioned sleeve 8 is disconnected from the die 2 and comes into contact with the buffer member 13. The pressing operation of the punch 3 is continued at this point of time, by which the molding is moved downward together with upper and lower plates 9, 10 relative to the sleeve 8. The press-contact force of the sleeve 8 and the molding is thus removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a die cutting method in a hot press molding machine and an apparatus therefor.

[Prior Art] Generally, a hot press molding machine is used as a device for sintering and molding ceramics and powder metals.

This hot press molding machine consists of a mold consisting of a cylindrical die and a pair of punches inserted into each end of the die, and compresses the sample by pressing the punches toward each other. and a heater that heats the mold.

Then, the sample is filled into the mold, and this mold is loaded between a pair of press rams, and then the mold is heated to raise the temperature of the sample inside to a predetermined temperature, and in this state, The sample in the mold is compressed by the press ram and sintered into a predetermined shape.

By the way, in such a hot press molding machine,
Since a large pressure is applied to the sample during molding, the molded product and the die are fixed by a large pressure force.

Conventionally, after the molding is completed and the mold temperature has fallen to a predetermined temperature, the mold is removed from between the press rams and transported to another work site, and a special die-cutting device is used to remove the molded product from the mold. The molded product is removed by separating it.

[Problems to be Solved by the Invention] However, when a molded product is die-cut using such a conventional method, it is necessary to provide a separate die-cutting device for the die-cutting operation, resulting in an increase in equipment. Moreover, since the mold cutting process must be performed separately, the production process becomes complicated.

Therefore, there is a risk that productivity will decrease and production costs will rise.

In addition, as mentioned above, since the pressure force between the molded product and the die is large, a large amount of power is also required for the die cutting device.
This forces the device to be larger and requires a larger space to install the equipment.

Therefore, in the past, it has been desired to deal with these problems, and the present invention aims to solve the problems remaining in the conventional technology.

[Means for Solving the Problems] The present invention aims to provide a die-cutting method and device for a hot plate molding machine that can effectively solve the above-mentioned problems, and the die-cutting method according to the first aspect is A sample is filled into a mold equipped with a cylindrical die and a pair of punches inserted from both ends of the die, and the sample is heated and pressurized by a pair of press rams to form it into a predetermined shape. A die-cutting method for a hot-press molding machine, which is applied when extracting the molded product from a mold, and is characterized by having the following steps 1 to 2: After the sample is pressure-molded, the pressurization operation by the press ram is stopped, and the die, first punch, and internal molded product are integrally moved to separate them from the second punch. Step ■9 After the step I, a step m of holding the die at a predetermined distance from the second punch and holding the molded product at a distance from the second punch, and after the step II. , a step of moving the molded product and the die relative to each other by pressing the first punch toward the second punch with a first press ram to remove the pressing force between the two; The related die-cutting device fills a sample into a mold equipped with a cylindrical die and first and second punches inserted from both ends of the die, heats the sample, and punches the first and second punches. Equipped with a hot press molding machine that pressurizes and molds into the specified shape using a press ram! A die cutting device that removes the pressure force between the molded product and the die, the die being removed from the second die.
A spacer is provided between the die and the second punch, which are separated by the transfer means, to maintain them at a predetermined distance. It is characterized by

[Operation] According to the die cutting method according to the first aspect of the present invention, after compression molding, the first punch, the molded product, and the die are separated from the second punch, and then the die is separated from the second punch. By bringing it into contact with the second punch via
A gap is formed between the second punch and the molded product, and in this state, the first punch presses the molded product toward the second punch, thereby increasing the pressure force between the molded product and the die. Remove.

Therefore, the mold is loaded into the molding machine and the mold is cut using the constituent members of the molding machine.

Further, according to the second aspect, the die is separated from the second punch by the transfer means, and in this state, a spacer is interposed between the second punch and the die. , a gap is formed between them, and the molded product and the second punch are held apart from each other. Therefore, the die cutting method according to the first aspect can be effectively implemented.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

First, before explaining the die cutting method according to the first aspect of the present invention, an example of the die cutting apparatus according to the second aspect, which is suitably used in this die cutting method, will be explained in FIGS. 1 and 3. This will be explained based on the diagram.

Reference numeral 1 in FIG. 1 indicates a hot press molding machine 1 to which this embodiment is applied, and this hot press molding machine consists of a cylindrical die 2 and first and second punches 3 inserted from both ends thereof.・A sample A is filled into a mold 5 equipped with
It is designed to be pressurized and molded into a predetermined shape.

Further, the die 2, both bunches 3 and 4, and both press rams 6 and 7 are arranged so that their respective axes run along the vertical direction, and inside the die 2, as shown in FIG. A tapered through hole 2a whose diameter gradually increases downward is formed as shown in FIG.
A tapered sleeve 8, which has an internal shape and an external shape between the channels and a uniform inner diameter, is attached coaxially and removably.

The tapered sleeve 8 is crimped into the through hole 2a of the die 2, and its deformation is restrained by the die 2, thereby regulating the outer peripheral shape of the molded product.

The first punch 3 is formed into a cylindrical shape having an outer diameter approximately equal to the inner diameter of the tapered sleeve 8 so as to be inserted into the tapered sleeve 8 in the die 2 from above, and the second The punch 4 has a tapered sleeve 8
A pressing protrusion 4a inserted from the lower part of the press ram 7 and a base body 4b fitted to the upper part of the second press ram 7 are provided, and between these punches 3 and 4 and the sample A,
An upper plate 9 and a lower plate 10 each having a disc shape and having an outer diameter substantially the same as the inner diameter of the tapered sleeve 8 are interposed.

Furthermore, the first press ram 6 is movable up and down in its axial direction, and is connected to a drive mechanism using hydraulic pressure or other power to move the first punch 3 to the second press ram 6.
The second press ram 7 is integrally protruded from the floor F, and the second punch 4 is placed on the upper end of the second press ram 7.

On the other hand, the die cutting device Z according to this embodiment is constructed by adding the following components to the components of the hot press molding machine 1.

That is, there is a hawk lift-like transfer means 11 which is engaged with the lower end of the die 2 and moves the die 2 in the vertical direction, and the die 2 is moved upward by the transfer means 11 to move the die 2 upward and downward. The annular spacer 12 is placed on the upper surface of the peripheral edge of the base body 4b of the second punch 4 while being separated from the punch 4, and the pressing force of the second punch 4 is applied inside the spacer 12. Protrusion 4
It is composed of two members: a ring-shaped buffer member 13 that surrounds the base body 4b and is placed on the upper surface of the base body 4b.

The spacer 12 is divided into two parts in the circumferential direction, and when assembled into an annular shape, its inner diameter is larger than the outer diameter of the lower end of the tapered sleeve 8 (and the outer diameter is larger than the outer diameter of the die 2). It is formed smaller than the diameter.

Further, the thickness of the buffer member 13 is equal to that of the spacer 1.
It is formed thinner than the thickness of 2.

Next, the die cutting device Z of this embodiment configured in this way
An embodiment of the die-cutting method related to the first deaf condition will be described along with the operation thereof.

First, the mold 5 filled with the sample A is placed between the press rams 6 and 7, and the second punch 4 is fitted onto the top of the second press ram 7.

Next, the first press ram 6 is lowered to come into contact with the upper part of the first punch 3 (this state is shown in FIG. 2).

From this point, while heating the sample to a predetermined temperature using a heater or the like, the first press ram 6 is heated as shown by the arrow in FIG.
The first punch 3 is pressed to compress the sample A.

Sample A is molded by this operation.

When the molding into the sample is completed, the heating operation is stopped and the heat is removed so that the mold 5 and the molded product S reach a predetermined temperature.

After waiting for such a temperature drop, the compression operation by the first press ram 6 is stopped, and the first press ram 6 is raised as shown in FIG. Separate.

Next, the transfer means 11 is brought into contact with the lower end of the die 2, and the transfer means 11 moves the die 2
is raised and separated from the second punch 4, and the upper part of the second punch 4 is opened.

In this state, the molded product S is pressed against the inner surface of the tapered sleeve 8 by the pressure applied during molding, and the tapered sleeve 8 is pressed against the inner surface of the die 2, as shown in FIG. , it is raised with die 2.

Next, after attaching the buffer member 13 and the spacer 12 to the base body 4b of the second punch 4, the die 2 is lowered and placed on the spacer I2 as shown in FIG. .

In this state, the press protrusion 4a of the second punch 4 is slightly fitted into the lower end of the tapered sleeve 8, thereby positioning the die 2 and the second punch 4. is held separated from the pressing protrusion 4a of the second punch 4 by the thickness of the spacer 12.

From this, the first press ram 6 is lowered and brought into contact with the first punch 3 as shown by the arrow in FIG. 4, and then the first punch 3 is moved as shown in FIG. Press down.

As a result of this operation, the diameter of the fitting surface between the tapered sleeve 8 and the die 2 is gradually increased downward, so that the tapered sleeve 8 is first separated from the die 2 as shown in FIG. and is brought into contact with the buffer member 13.

At the time when the tapered sleeve 8 and the buffer member [3 come into contact with each other, the lower plate lO and the pressing protrusion 4
Since a gap equal to the thickness of the cushioning member 13 is formed between the first press ram 6 and the first punch 3, the molded product S can be pressed against the upper and lower plates 9. - Together with 10, it is moved relative to the tapered sleeve 8 downward, and as a result of this relative movement, the pressure force between the tapered sleeve 8 and the molded product S is removed.

During such relative movement of the molded product S with respect to the tapered sleeve 8, in this embodiment, since the plates 9 and 10 are brought into contact with the upper and lower surfaces of the molded product S, respectively, the upper surface of the molded product S is In this case, the pressing force applied by the first press ram 6 is applied to the upper plate 9.
In addition, the lower surface is covered with the lower plate 10 to prevent unnecessary deformation.

As a result, when the pressure bonding force between the molded product S and the tapered sleeve 8 is removed, the molded product S is prevented from being cracked.

After this, the first press ram 6 is raised and separated from the first bunch 3, and then the transfer means 11 is moved to the second press ram 6.
The mold 5 is brought into contact with the lower end of the bunch 4, and as shown in FIG. 6, the mold 5 is lifted and transported to the post-processing process. pull out.

When removing the mold 5, the mold 5 can be easily removed since the pressure bonding force with the tapered sleeve 8 has already been removed, and the tapered sleeve 8 and the molded product S
Since the pressure bonding force between the molded product S and Being molded.

On the other hand, the mold 5 from which the molded product S has been extracted as described above is assembled onto the lower plate 10 after the die 2, the tapered sleeve 8, the second bunch 4, and the lower plate IO are assembled. After the sample is filled and the upper plate 9 and the first bunch 3 are assembled, the sample is transported again to the molding process by the transport means 11.

However, according to the die cutting method of this embodiment,
Since the mold cutting operation is performed as part of the flow of the molding process for sample A, and the mold cutting is performed using the components of the hot press molding machine 1, the enlargement of the device and the expansion of the installation space are suppressed. In addition, it becomes possible to simplify the molding line, significantly improving productivity and reducing production costs.

On the other hand, since the molded product S is punched out by the press rams 6 and 7 used for compressing the sample A, a large pressing force can be easily obtained during punching.

Further, according to the die cutting device Z of the above embodiment, the spacer 12 and the buffer member 13 can be added to the existing hot press molding machine 1.
The die cutting method can be carried out simply and reliably by simply adding a member.

Note that the shapes and dimensions of each component shown in the above examples are merely examples, and may vary depending on the molding machine to be applied, the type of sample, etc.
Alternatively, various changes can be made based on design requirements and the like.

For example, in the embodiment described above, an example is shown in which the present invention is applied to a hot press molding machine disposed along the vertical direction, but the hot press molding machine to which the present invention is applied can be installed in any direction.

Further, although the second press ram 7 is illustrated as a fixed type,
The first press ram 6 may be of a fixed type, or
Both may be of a type in which pressing force is applied by a driving source.

[Effects of the Invention] As explained above, according to the die cutting method in the hot press molding machine according to the first aspect of the present invention, the following excellent effects are achieved.

As part of the flow of the sample molding process, die-cutting operations are performed continuously, and die-cutting is performed using components of a hot press molding machine, so it is necessary to provide a separate die-cutting device. This makes it possible to suppress the increase in equipment size and equipment installation space.

Therefore, the molding line can be simplified, productivity can be greatly improved, and production costs b can be reduced.

Moreover, since the molded product is punched out by both press rams used to compress the sample, sufficient pressing force can be easily obtained during punching, and reliable punching can be performed.

Further, according to the second aspect of the present invention, since the die cutting device is configured by simply adding a spacer to an existing hot press molding machine, the hot press molding machine can be used as a die cutting device without any structural change. It can be used for both purposes, and the die cutting method according to the first aspect can be carried out easily and reliably.

[Brief explanation of drawings]

In the drawings, FIG. 1 is a side view of a hot press molding machine to which an embodiment of the die cutting device according to the second aspect of the present invention is applied, and FIGS. 2 to 6 are views of the mold according to the first aspect. This shows an example of the punching method. Fig. 2 is a vertical cross-sectional view of a hot press molding machine showing a state in which a sample is compression-molded, and Fig. 3 is a vertical cross-sectional view showing a state in which the die is lifted by a transfer means after molding. 4 is a vertical cross-sectional view showing a state in which the die is placed on the second press ram via a spacer, and FIG. 5 is a vertical cross-sectional view showing a state in which the molded product in the die is pressed down.
FIG. 6 is a longitudinal sectional view showing the state in which the mold is transported by the transport means. 2...Mold cutting device.

Claims (2)

[Claims] (1) Fill a sample into a mold equipped with a cylindrical die and a pair of punches inserted from both ends of the mold, heat the sample, and pressurize it with a pair of press rams to shape it into a predetermined shape. A die cutting method for a hot press molding machine that is applied when the molded product is extracted from a mold in a hot press molding machine that performs molding, and is characterized by having the following steps I to III. Method I: After the sample is pressure-molded, the pressurization operation by the press ram is stopped, and the die, first punch,
and Step II of moving the internal molded product integrally to separate them from the second punch, after the step I above, holding the die at a position at a predetermined distance from the second punch. , the molded product is placed in a second
step III of holding the molded product at a distance from the punch; after step II, the molded product and the die are pressed by a first press ram toward the second punch; The process of removing the pressure force between the two by moving them relative to each other. (2) A sample is filled into a mold equipped with a cylindrical die and first and second punches inserted from both ends of the mold, and the sample is heated, and the sample is heated by the first and second press rams. A die cutting device that is attached to a hot press molding machine that pressurizes and molds into a predetermined shape and removes the pressure force between the molded product and the die, the die being attached to the second punch. and a spacer interposed between the die and the second punch separated by the transfer means to maintain them at a predetermined distance. Die cutting device for hot press molding machine