JPH09300039A - Forging press apparatus and forging method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily take out a forged product from a die on the apparatus side and to reduce a working cost by arranging a side pressure giving means for pressing the side surface of the die on the apparatus side in the direction orthogonal to the press direction while synchronizing with a forging process. SOLUTION: At the time of pushing a piston rod 29a by operating a hydraulic cylinder 29, a toggle mechanism 21 with its shaft part 17 pushed up to widen bending angles of arms 24, 25 and the side surface of the die 9 on the apparatus side is pushed in the direction orthogonal to the press direction by a heat insulating material 22. After passing for a prescribed time from release of the forging load, the side pressure load of the toggle mechanism 26 is released. A close contact of the forged product with the die 9 on the apparatus side is avoided by returning back a ring die 10 to the original shape, and small gap between both is caused. By this method, the take-out of the forged product from the die 9 on the apparatus side can easily be executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forging press device and a forging method for producing a forged product by pressing with a device-side die and a movable die, and particularly, for forging the forged product easily from the device-side die. Regarding things that can be taken out.

[0002]

2. Description of the Related Art Generally, when manufacturing various forged products, a forging press device is used. And a movable mold that moves toward the end. Then, a forged product corresponding to the device-side mold and the movable mold is manufactured by a forging process in which a predetermined metal block for forging is set between the device-side mold and the movable mold and pressed. Is what you can do.

Here, between the apparatus side mold and the movable mold,
When a forging load for the press is applied, a force acts on the apparatus-side mold in the direction in which it is spread by the forged product, that is, in the direction orthogonal to the pressing direction. Especially,
When forming a rib on a forged product, a large force acts on the side on which the rib is formed. Therefore, when a device side mold having a small thickness in the side surface direction is used, there is a problem such as damage of the mold due to the above-mentioned force. I try to use thick ones.

[0004]

However, the above-mentioned conventional forging press device has the following problems. That is, even when a device-side mold having a large wall thickness in the lateral direction is used, a forging load of several hundred tons works due to pressing, so that the device-side mold swells in the lateral direction. Then, after removing the forging load, the side surface of the apparatus-side mold returns to its original state, so that the forging product comes into close contact with the side surface. This has a problem that it is not easy to take out the forged product from the apparatus side mold.

Particularly, in the case of hot forging (for example, titanium alloy), forging is performed in a state where the die on the apparatus side is heated to several hundreds of degrees or more, and the forged product produced is also at high temperature (for example, 7).
Since the temperature is 50 ° C.), it is difficult to take out the forged product if it is in close contact with the apparatus-side mold. Moreover, when the forged product is taken out by this hot forging, the ejector pin is pushed up from the lower part of the die on the device side. It will cause omissions and deformations.

Further, when a die having a large thickness in the lateral direction is used as the die on the apparatus side, a large amount of expensive die material is used, and die machining costs such as machining, electric discharge machining and polishing are reduced. Make it higher Further, there is a problem that the period required for the die processing becomes long and the delivery time of the forged product to be manufactured becomes long. On the other hand, when a device side mold with a thin side wall thickness is used, such a problem does not occur, but if the side wall thickness is thin, the die strength decreases, so forging There is a problem that it cannot bear the load.

The present invention has been made in view of the above problems, and it is possible to easily take out a forged product from the apparatus-side mold, while maintaining the strength of the apparatus-side mold. An object of the present invention is to provide a forging press device and a forging method capable of reducing the processing cost of a device-side die.

[0008]

In order to solve the above problems and to achieve the above object, a forging press device according to claim 1 is a device-side mold installed in a device body, and a device-side mold. A forging press device comprising a movable mold that moves toward a mold and manufacturing a forged product by a forging process of pressing with a predetermined forging load, in the device body, the device side metal in synchronization with the forging process. It is characterized in that a side pressure applying means for pressing the side surface of the mold in a direction orthogonal to the pressing direction is provided.

In the forging press device according to a second aspect, the device-side mold comprises a ring die, an insert installed along the inner wall of the ring die, and a mold body installed in the insert. It is characterized by being done. The forging press device according to claim 3, wherein the lateral pressure applying means is
It is composed of a fixing portion that receives one side surface of the apparatus-side mold and a toggle mechanism that presses the other side surface of the apparatus-side mold, and the toggle mechanism is provided with a hydraulic cylinder that drives this toggle mechanism. It is characterized by being.

Further, the forging method according to claim 4 uses a device-side mold installed in the device body and a movable mold that moves toward the device-side mold, and presses with a predetermined forging load. In the forging method of producing a forged product by the forging process,
In synchronization with the forging process, the side surface of the apparatus-side mold is pressed in a direction orthogonal to the pressing direction, the forged product is deformed in the lateral pressure direction, and then the pressing is released, and then the forged product is taken out. It is characterized by doing so. The forging method according to claim 5 is characterized in that the side surface of the apparatus-side mold is pressed in the lateral pressure direction in advance during the pressing.

A forging method according to a sixth aspect is the forging method according to the fifth aspect, wherein the pressing force in the lateral pressure direction against the side surface of the apparatus-side mold is increased in a predetermined time before the unloading of the forging load. It is characterized in that the forged product is deformed in the lateral pressure direction. The forging method according to claim 7 is the forging method according to claim 5, wherein the pressing force from before the unloading is continued for a predetermined time after the unloading of the forging load to deform the forged product in the lateral pressure direction. It is characterized by doing so. The forging method according to claim 8 is
The forging method according to claim 7 is characterized in that the pressing force to be continued is lower than that before the unloading of the forging load.

As described above, in the forging press apparatus according to the first aspect, the apparatus main body is provided with the lateral pressure applying means, and the side surface of the apparatus side die is pressed in a direction orthogonal to the pressing direction in synchronization with the forging process. Therefore, after the forging load is removed, the forged product in the apparatus-side mold is slightly deformed by the pressure applied by the lateral pressure applying means. Therefore, since the device-side mold and the forged product do not come into close contact with each other, such a forged product can be easily taken out by reducing the binding force of the device-side mold. Moreover, since the side pressure applying means supports the side surface of the apparatus-side mold, it is possible to withstand the forging load even if the thickness of the apparatus-side mold in the side surface direction is reduced.

Further, the forging press device according to claim 2 is
Since the device side mold is composed of a ring die, an insert, and a mold body, it is sufficient to change the insert and the mold body when making different forged products, and the large ring die is used continuously. It is possible to do. Therefore, a large amount of expensive die material is not used, and die processing costs such as machining, electric discharge machining, and polishing are reduced. Further, since the period required for the die processing is short, the delivery time of the forged product to be produced also becomes short.

In the forging press device according to the third aspect of the present invention, the die on the device side is sandwiched between the fixing portion and the toggle mechanism as the side pressure applying means, and the toggle mechanism is driven by the hydraulic cylinder, so that the forging load is applied. It is designed to be able to apply lateral pressure that is not lost easily and surely. Therefore, even if the forging load is several hundred tons, by driving this toggle mechanism, it is possible to easily apply lateral pressure to the device side mold, and because this side pressure applying mechanism is small, the entire device is It is possible to reduce the size.

In the forging method according to the fourth aspect, since the side surface of the apparatus-side mold is pressed in the direction orthogonal to the pressing direction in synchronization with the forging process, the forged product in the apparatus-side mold is deformed in this lateral pressure direction. It is in the state of doing. Therefore, as a result of not closely contacting the device-side mold and the forged product, such a forged product reduces the binding force by the device-side mold after the pressure in the lateral pressure direction is released. It can be taken out easily.

In the forging method according to the fifth aspect, during pressing, the side surface of the apparatus-side mold is pressed in the lateral pressure direction in advance so that the forging load is applied to cancel the expansion of the apparatus-side mold. Therefore, after the unloading of the forging load, the dimension of the forged product to be manufactured is set to a desired set value.

In the forging method according to the sixth aspect, the side surface of the apparatus-side mold is continuously pressed in the lateral pressure direction in advance, and the pressing force applied during the predetermined time period before unloading the forging load is increased. It is possible to more easily secure the deformation of the forged product in the lateral pressure direction. Therefore, the forged product further reduces the binding force by the device-side mold after the pressing in the lateral pressure direction is released, and thus the forged product can be easily taken out from the device-side mold.

In the forging method according to the seventh aspect, the side surface of the apparatus-side mold is continuously pressed in the lateral pressure direction in advance, and the pressing force before the forging load is unloaded at a predetermined time after the forging load is unloaded. Therefore, the forged product is easily deformed in the lateral pressure direction after the forging load is removed. Therefore,
The forged product further reduces the binding force by the device-side mold after the pressing in the lateral pressure direction is released, and thus can be easily taken out from the device-side mold.

In the forging method according to the eighth aspect, since the pressing force to be continued after the unloading of the forging load is lower than that before the unloading of the forging load, the lateral pressure against the die on the apparatus side is larger than necessary. Is not given. Therefore, the forged product in the die on the apparatus side is prevented from being deformed more than necessary, so that the size of the forged product is not changed by the pressing of the lateral pressure applying means.

[0020]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS. As shown in FIGS. 1 and 2, a flat surface portion 2 is provided on the left and right of the upper surface of the base 1a of the apparatus main body 1.
a, 3a and subsequent supporting blocks 2, 3 each having a standing surface 2b, 3b are installed, the supporting block 2 being positioned by the key 4 and being fixed to the base 1a by bolts, and also the supporting block 3 is positioned by the key 5 and is fixed to the base 1a with bolts. And the base 1a between the support blocks 2 and 3
A heater plate 7 is fixed on the upper side of the heat insulating material 6. A heat insulating material 8 is installed between the heat insulating material 6 and the heater plate 7 and the support blocks 2 and 3.

This heat insulating material 6 is used to shield the heat of the heater plate 7 from the base 1a, and
Since it is subjected to a forging load, which will be described later, it is made of a material having strength, such as zirconite.
On the other hand, the heat insulating material 8 is used to shield the heat of the heater plate 7 from each of the support blocks 2 and 3. However, unlike the heat insulating material 6, the heat insulating material 8 does not receive a forging load, which will be described later. Therefore, it is not necessary to use a material having strength, and for example, a cotton material is used.

The heater plate 7 has a flat surface 2 on the upper surface thereof.
It is set so as to be flush with a and 3a, and the apparatus-side mold 9 is placed on this upper surface. Since the heater plate 7 receives a forging load, a heater plate having a certain strength is used. As shown in FIG. 3, the apparatus-side mold 9 is composed of a metal ring die 10, an insert 11, and a punch (mold body) 12. In addition, the device side mold 9
Is heated to a high temperature by the heater plate 7,
It is made of a heat resistant material.

The ring die 10 is formed in a rectangular frame shape, and a step portion 13 is provided on the inner wall thereof. However,
The ring die 10 is not limited to be integrally formed as shown in the figure, and may be integrated by, for example, combining and fixing a plurality of members. The insert 11 is used to determine the side surface outer peripheral dimension of the forged product to be manufactured, and is formed in a rectangular frame shape that can be fitted along the upper portion of the step portion 13 of the inner wall of the ring die 10. It should be noted that whether or not the insert 11 is divided is optional.

The punch 12 is used to form the unevenness of the forged product, and is formed in a rectangular shape that can be fitted along the lower portion of the step 13 of the inner wall of the ring die 10. Whether or not these inserts 11 and punches 12 are fixed to the ring die 10 is optional, but for the convenience of replacement with other inserts 11 or punches 12, it is possible to easily remove them from the ring die 10. It is preferable.

The apparatus-side mold 9 is provided with a plurality of inserts 11 having different thicknesses and a plurality of punches 12 having different shapes, so that the dimensions of the forged product to be manufactured can be improved. These can be appropriately replaced according to the shape. Therefore, even if a forged product having a different shape is manufactured, the ring die 10 can be continuously used as it is. Therefore, when forming a plurality of molds of various shapes, a large amount of expensive mold material is used. There is no need, and machining, electrical discharge machining,
The die processing cost such as polishing is reduced.
Further, since the period required for the die processing is short, the delivery time of the forged product to be produced also becomes short.

However, as shown in the drawing, the apparatus-side mold 9 is not limited to being divided into the ring die 10, the insert 11 and the punch 12, and for example, the apparatus-side mold in which these are integrally formed, An apparatus-side mold in which only the punch 12 can be replaced may be used. Further, it is optional whether or not the apparatus-side mold 9 is installed on the heater plate 7 in a positioned state.

Next, on the flat surface portion 2a of the support block 2,
A fixing portion 14 for receiving one side surface of the apparatus-side mold 9 is provided as a part of the lateral pressure applying means. The fixing portion 14 includes a heat insulating material 15, a holding member 16, and shims 17, 17.
a, a receiving block 18, and a load supporting member 19. The heat insulating material 15 is the device side mold 9 (ring die 1
A plurality of them are arranged so as to come into contact with the side surface of (0) and require the same strength as the heat insulating material 6, so that one formed of zirconite or the like is used.

The holding member 16 is provided with a recess 16a for holding the heat insulating material 15, and the heat insulating material 15 is held individually. The shims 17, 17a are
It is installed on the back surface of each of the holding members 16, and has a thickness of about 10 mm. The shims 17 and 17a have different thicknesses, and the shim 1
7a is formed thicker. This is a ring die 1
This is because the inner heat insulating material 15 is pressed against the side surface of the ring die 10 more strongly so that 0 does not swell. However,
The thickness difference between the shims 17 and 17a is set to 1 mm or less.

The receiving block 18 is installed on the flat surface portion 2a so as to contact the shims 17 and 17a. The load supporting member 19 is installed so as to be sandwiched between the receiving block 18 and the upright surface 2b. Therefore, the load received by the heat insulating material 15 from the side surface of the apparatus-side mold 9 is equal to
6, the shims 17 and 17a, the receiving block 18, and the load supporting member 19 are received by the upright surface 2b of the supporting block 2.

The fixing portion 14 is not limited to the above-mentioned structure, and may have any structure as long as it supports the side surface of the apparatus-side mold 9. However, since the apparatus-side mold 9 is heated to a high temperature, it is preferable to use a heat insulating material in the contact portion with the apparatus-side mold 9. A heater tube 20 extending from the heater plate 7 is installed on the flat surface portion 2 a, and lead wires are housed in the heater tube 20. The heater tube 20 is drawn out from the gap of the load supporting member 19 or the like.

Next, on the flat surface portion 3a of the support block 3,
A toggle mechanism 21 for pressing the other side surface of the apparatus-side mold 9 is provided as a part of the lateral pressure applying means. The toggle mechanism 21 includes a heat insulating material 22, a holding member 23, arms 24 and 25, and a hydraulic cylinder 29. The heat insulating material 22 is similar to the heat insulating material 15 in the apparatus-side mold 9
A plurality of (ring dies 10) are arranged so as to come into contact with the side surface of the (ring die 10) and strength is required, so that one formed of zirconite or the like is used.

The holding member 23, like the holding member 16,
A recess 23a for holding the heat insulating material 22 is provided, and the heat insulating material 22 is individually held. Further, on the back surface of the holding member 23, protrusions 23b are provided, respectively. The arm 24 is rotatably attached to the protruding portion 23b by the shaft portion 26, and
The arm 25 is rotatably attached to the protrusion 30 provided on the upright surface 3b by the shaft 28. Further, a space between the arms 24 and 25 is rotatably attached by a shaft portion 27.

The hydraulic cylinder 29 has a piston rod 29.
It is provided on the support block 3 in a state where a is connected to the shaft portion 27. The toggle mechanism 21 configured in this way is
It is suitable for obtaining a large pressing force with a small driving force. Then, by operating the hydraulic cylinder 29 and moving the piston rod 29a upward, the heat insulating material 22 presses the side surface of the apparatus-side mold 9 in a direction orthogonal to the pressing direction described later. Specifically, for example, each of the four heat insulating materials 22 has a thickness of 200 to 30.
A load of 0 tons, about 1000 tons in total, is applied to the apparatus-side mold 9.

A hydraulic cylinder 29 is provided for each shaft 27.
The pressure of the heat insulating material 22 with respect to the apparatus-side mold 9 can be set individually. Therefore, by setting the pressing force of the inner heat insulating material 22 to be larger than that of the outer insulating material 22, it is possible to cope with the expansion of the apparatus-side mold 9 (ring die 10). The hydraulic cylinder 29 is provided for each shaft 27, but one hydraulic cylinder 29 is used so that the piston rod 29a is connected to all the shafts 27. Good.

Instead of the hydraulic cylinder 29, another mechanism may be used to drive the toggle mechanism 21. Further, as shown in FIG.
It is not limited to using the toggle mechanism 21 and the toggle mechanism 21. For example, instead of the toggle mechanism 21, a hydraulic cylinder may directly press the side surface of the apparatus-side mold 9. However, since the load of about 1000 tons is required as described above, a large-sized hydraulic cylinder is required, while the toggle mechanism 21 shown in the figure can be downsized as a whole, so that the apparatus body 1 can be downsized. Becomes

Further, in the forging press device shown in FIGS. 1 and 2, the lateral pressure applying means sandwiches one side surface of the die 9 on the apparatus side, but the invention is not limited to this.
That is, in addition to the structure shown in FIG. 2, side pressure applying means may be provided in the direction in which the other side surface is sandwiched. By providing the lateral pressure applying means in this way,
The apparatus-side mold 9 can maintain the strength of the mold even when a thin ring die 10 is used.

Further, the apparatus body 1 is provided with a movable die 31 which is movable toward the apparatus-side die 9. Then, a metal block is set on the punch 12 of the apparatus-side mold 9 and pressed by the apparatus-side mold 9 and the movable mold 31 to manufacture a forged product. Various known types are used to drive the movable mold 31. The forging load for this press is about 3,000.
Tons have been added.

By the way, when a lateral force acts on the mold, a spigot is usually provided on the upper and lower molds, but this requires a thick mold material, which increases the mold cost. . On the other hand, in the illustrated forging press device, since the upper and lower molds can be engaged with each other on the low temperature outer wall portion (for example, the support blocks 2 and 3), the mold cost does not change. The forging press device described above is used for hot forging, but the present invention is not limited to this and can be used for cold forging.

Next, the forging method using this forging press device will be explained. First, the insert 11 and the punch 12 are set in the ring die 10 so as to correspond to the forged product to be produced, and the die 9 on the device side is set. Finalize. Then, in the case of hot forging of titanium alloy, the device side mold 9 is heated to about 750 ° C. to 900 ° C. by the heater plate 7, and the titanium alloy block is installed in the device side mold 9. The heating temperature of the apparatus-side mold 9 can be arbitrarily set by the heater plate 7.

Next, the movable mold 31 is moved toward the device-side mold 9, and the hydraulic cylinder 29 is operated to push up the piston rod 29a. As a result, before the titanium alloy is pressed by the apparatus-side mold 9 and the movable mold 31, the toggle mechanism 21 lifts the shaft portion 27 to widen the bending angle of the arms 24 and 25, and the heat insulating material 22 causes the device to move. The side surface of the side mold 9 is pressed in a direction orthogonal to the pressing direction. That is, the apparatus-side mold 9 is in a state of being subjected to a lateral pressure load (pressing force) by being driven by the toggle mechanism 21 before receiving a forging load for pressing.

Therefore, the apparatus-side mold 9 is sandwiched between the fixed portion 14 and the toggle mechanism 21,
The ring die 10 is bent inward. After that, a forging load is applied between the apparatus-side mold 9 and the movable mold 31. The ring die 10 swells to the outside by the forging product being spread in the apparatus-side mold 9 by this forging load, but this ring die 10 has the toggle mechanism 21.
As a result, the forged product is preliminarily bent inward, so that the forged product is manufactured to have a predetermined size.

After the forging load is removed, the lateral pressure load by the toggle mechanism 21 is released after a predetermined time has elapsed. In this way, after unloading the forging load, the toggle mechanism 21 is operated for a predetermined time.
By applying the lateral pressure load at, the forged product is deformed in the lateral pressure direction (direction orthogonal to the pressing direction) in the apparatus side mold 9. Therefore, when this lateral pressure load is released, the ring die 10 returns to its original shape, and the forged product and the apparatus-side mold 9 (insert 1
The close contact with 1) is avoided, and a slight gap is created between the two.

As a result, the binding force of the forged product from the apparatus-side mold 9 is reduced, so that the forged product can be easily taken out from the apparatus-side mold 9. That is, even when the ejector pin is used to take out the forged product, the forged product does not come off or deform. In addition, in the state in which the lateral pressure load is applied by the toggle mechanism 21, the device side mold 9
The side surface on the side opposite to is supported by the fixing portion 14. At this time, the fixing portion 14 is attached to the apparatus-side mold 9.
Although the swelling force also acts on the side, the swelling of the ring die 10 is restricted by making the shim 17a thicker than the shim 17.

In the forging method, the lateral pressure load is applied by the toggle mechanism 21 in advance before the forging load is applied, but the invention is not limited to this.
For example, while the forging load is being applied, the toggle mechanism 21 may be driven to apply the lateral pressure load.

Further, in the above forging method, the lateral pressure load is continuously applied for a predetermined time after unloading the forging load, but the present invention is not limited to this, and for example, for a predetermined time before unloading the forging load. In order to increase the lateral pressure load applied in advance by the toggle mechanism 21 to deform the forged product in the apparatus side mold 9 in the lateral pressure direction, the forging load and the lateral pressure load may be unloaded almost simultaneously. Good.

When the lateral pressure load is applied by the toggle mechanism 21 for a predetermined time after the forging load is removed, the lateral pressure load previously applied by the toggle mechanism 21 is not limited to be continued as it is. After unloading, the lateral pressure load may be reduced and continued for a predetermined time. As a result, the forged product in the apparatus side mold 9 can be prevented from being deformed more than necessary, and the size of the forged product is prevented from fluctuating due to the pressing of the toggle mechanism 21.

By the toggle mechanism 21 as described above,
The timing of applying the pressure load is as shown in Fig. 4.
I have. It should be noted that in FIG.
The forging method that applied the lateral pressure load was shown.
Things. In this graph, the forging load is the time
Rises from 0 with the lapse of₀ Unloaded to
You. On the other hand, the lateral pressure load A is t when the forging load is unloaded.₀ And almost
At the same time, it is set to a small value and the predetermined time t₁ Continue to add
After being loaded, the cargo is unloaded. Lateral load B is the removal of forging load
Time t₀ From the specified time t₁ Continue with the same size until
Are added and then unloaded. Lateral pressure load C is a predetermined time
t_Two At the time of unloading t ₀ Up to that size
Is continuously added and then unloaded.

That is, the timing and the size of the lateral pressure load applied by the toggle mechanism 21 are synchronized with the forging process of the apparatus side mold 9 and the movable mold 31, and as a result, the apparatus side mold 9 and the forged product are Any setting can be made as long as the contact can be released. However, whichever setting is set, the device-side mold 9 is pressed in the lateral pressure direction to deform the forged product in the lateral pressure direction, and thus the close contact between the two is still prevented.

[0049]

As described above, in the forging press apparatus according to the first aspect, the apparatus main body is provided with the lateral pressure applying means,
Since the side surface of the device side mold is pressed in the direction orthogonal to the pressing direction in synchronization with the forging process, after the forging load is removed, the forged product in the device side mold is pressed by the side pressure applying means. It is in a slightly deformed state. Therefore,
Since the device-side mold and the forged product do not come into close contact with each other, such a forged product can be easily taken out from the device-side mold by reducing the binding force of the device-side mold. Moreover,
Since the side surface of the apparatus-side mold is supported by this side pressure applying means, it is possible to withstand the forging load even if the side wall thickness of the apparatus-side mold is thin, and reduce the mold cost. You can

The forging press device according to claim 2 is
Since the device side mold is composed of a ring die, an insert, and a mold body installed in this insert, it is sufficient to change the insert and the mold body when manufacturing different forged products, and a large ring. The die can be used continuously as it is. Therefore, a large amount of expensive die material is not used, and die processing costs such as machining, electric discharge machining, and polishing can be reduced. Furthermore, since the period required for the die processing is short, the delivery time of the forged product to be manufactured can be shortened.

In the forging press device according to the third aspect, as the side pressure applying means, the device side mold is sandwiched between the fixing part and the toggle mechanism, and the toggle mechanism is driven by the hydraulic cylinder. An unbeatable lateral pressure can be applied easily and reliably. And even if the forging load is several hundred tons, by driving this toggle mechanism, it is possible to easily apply lateral pressure to the device side mold, and because this side pressure applying mechanism is small, the entire device Can be miniaturized.

In the forging method according to the fourth aspect, since the side surface of the apparatus-side mold is pressed in the direction orthogonal to the pressing direction in synchronization with the forging process, the forged product in the apparatus-side mold is deformed in this lateral pressure direction. It is in the state of doing. Therefore, as a result of not closely contacting the device-side mold and the forged product, such a forged product can reduce the binding force by the device-side mold after the pressure in the lateral pressure direction is released, and thus the device-side mold can be reduced. Can be easily removed from.

In the forging method according to the fifth aspect, the side surface of the apparatus-side mold is pressed in the lateral pressure direction in advance at the time of pressing so that the forging load is applied to cancel the expansion of the apparatus-side mold. Therefore, after the forging load is removed, the dimensions of the forged product to be manufactured can be set to a desired set value.

In the forging method according to the sixth aspect, the side surface of the apparatus-side mold is continuously pressed in the lateral pressure direction in advance, and the pressing force applied during the predetermined time period before unloading the forging load is increased. The deformation of the forged product in the lateral pressure direction can be more easily ensured. Then, the forged product can further reduce the binding force by the device-side mold after the pressing in the lateral pressure direction is released, and thus can be easily taken out from the device-side mold.

In the forging method according to the seventh aspect, the side surface of the apparatus-side mold is continuously pressed in the lateral pressure direction in advance, and the pressing force from before the forging load is unloaded at a predetermined time after the forging load is unloaded. Therefore, the forged product can be easily deformed in the lateral pressure direction after unloading the forging load.
And the forged product, after the pressure in the lateral pressure direction is released,
The binding force of the device-side mold can be further reduced, and thus the device-side mold can be easily taken out.

In the forging method according to the eighth aspect, since the pressing force to be continued after the unloading of the forging load is lower than that before the unloading of the forging load, the lateral pressure against the die on the apparatus side is larger than necessary. Can be prevented from being given. As a result of preventing the forged product in the apparatus-side mold from being deformed more than necessary, it is possible to prevent the size of the forged product from changing due to the pressing of the lateral pressure applying means.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a forging press device according to the present invention.

2 is a plan view of the forging press device shown in FIG. 1. FIG.

FIG. 3 is an exploded perspective view of an apparatus-side mold.

FIG. 4 is a graph showing the relationship between load and time.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device main body 9 Device side mold 10 Ring die 11 Insert 12 Punch (mold main body) 14 Fixed part (side pressure applying means) 21 Toggle mechanism (side pressure applying means) 29 Hydraulic cylinder 30 Movable mold

Claims (8)

[Claims] 1. A forged product is prepared by a forging process in which a device-side mold installed in a device body and a movable mold that moves toward the device-side mold are provided, and a forging process is performed by pressing with a predetermined forging load. In the forging press device, the device main body is provided with side pressure applying means for pressing the side surface of the device side mold in a direction orthogonal to the pressing direction in synchronization with the forging process. . 2. The apparatus-side mold comprises a ring die, an insert installed along the inner wall of the ring die, and a mold body installed in the insert. Item 1. The forging press device according to Item 1. 3. The side pressure applying means includes a fixing portion that receives one side surface of the apparatus-side mold and a toggle mechanism that presses the other side surface of the apparatus-side mold. The forging press device according to claim 1 or 2, further comprising a hydraulic cylinder that drives the toggle mechanism. 4. A forging for manufacturing a forged product by a forging process of pressing with a predetermined forging load, using a device-side mold installed in the device main body and a movable mold moving toward the device-side mold. In the method, the side surface of the apparatus-side mold is pressed in a direction orthogonal to the pressing direction in synchronization with the forging process, the forging is deformed in the lateral pressure direction, and then the pressing is released before the forging is pressed. A forging method characterized by taking out. 5. The forging method according to claim 4, wherein the side surface of the apparatus side mold is pressed in the lateral pressure direction in advance during the pressing. 6. The pressing force in the lateral pressure direction against the side surface of the apparatus-side mold is increased during a predetermined time before unloading the forging load so that the forged product is deformed in the lateral pressure direction. The forging method according to claim 5, wherein. 7. The pressing force from before the unloading is continued for a predetermined time after the unloading of the forging load, and the forged product is deformed in the lateral pressure direction. Forging method. 8. The forging method according to claim 7, wherein the pressing force to be continued is lower than that before the unloading of the forging load.