JPS5852743B2 - Molten metal forging mold equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a molten metal forging die device.

In molten metal forging, a molten metal forging mold is usually attached to a vertical hydraulic press machine equipped with an upper ram and a knockout ram, the upper ram clamps the mold, and the knockout ram pressurizes the molten metal.

This type of hydraulic press machine generally has an upper ram output of 15
00), the output of the knockout ram is about 150 tons, and the output of the knockout ram is approximately 171 tons of the upper ram output.
It is ranked 0, so when the press machine to be used is decided,
When designing a molten metal mold, the ratio between the mold clamping force and the molten metal pressing force is determined, which is undesirable because it imposes restrictions on mold design.

Moreover, the knockout ram is usually attached to the press table of the press machine, and the mold structure is therefore also constrained by this.

Therefore, in conventional molten metal forging dies, a molten metal storage cavity is generally provided in a lower die mounted on a press table, and a pressurizing plunger that also serves as the bottom surface of the molten metal storage cavity is placed in the molten metal storage cavity. By raising the inside of the molten metal storage cavity by a knockout ram, the molten metal in the cavity is filled into a mold cavity defined by a lower mold and an upper mold attached to an upper ram.

However, to prevent such molten metal forging from occurring, it is necessary to raise the upper mold from the lower mold and release it before pouring the molten metal into the molten metal storage cavity. Therefore, it takes a long time from pouring the molten metal to pressurizing the molten metal. If the process is long, the temperature of the molten metal will drop significantly and oxides will easily appear on the surface of the molten metal, and the oxides on the surface of the molten metal will first fill the mold cavity, reducing the quality of the molten metal forged product.

On the other hand, the applicant who is the same as the applicant in question
In No. 11009, a molten metal forging apparatus was proposed in which a molten metal storage cavity was formed in the upper die, a pressurizing plunger was built into the upper die, and the molten metal was poured after the mold was clamped.

In detail, such a molten metal forging apparatus has a forging die that includes at least an upper die and a lower die and defines a die cavity by the two dies, and the upper die passes through the forging die up and down, and the die is formed on the lower side of the forging die. A molten metal storage cavity communicating with the mold cavity is provided, the lower mold is provided with a guide hole opening on the upper surface of the lower mold at a position corresponding to the molten metal storage cavity, and an upper part of the molten metal storage cavity is provided with a guide hole for storing the molten metal. A Calo pressure plunger that can be inserted into the storage cavity is disposed so as to be vertically movable, and in the guide hole, the plunger selectively contacts the lower surface of the upper mold to cut off communication between the molten metal storage cavity and the mold cavity. The counter core is arranged to be movable up and down.

Such a molten metal forging device eliminates the above-mentioned problems and drawbacks of conventional molten metal forging dies, but the upper die is attached to the upper ram of the press machine, the lower die is attached to the press table, and the processing Since the pressure plunger is connected to the knockout ram, the upper ram must be provided with another hydraulic cylinder piston device to drive the molten metal pressurization plunger, making it a so-called double-acting press machine.

As a result, the press machine becomes complicated and expensive, and its sequence control system becomes complicated.

Furthermore, if an attempt is made to forge molten metal using existing hydraulic press machines, there will be a lot of waste due to specifications because these hydraulic press machines are not designed for molten metal forging.

SUMMARY OF THE INVENTION An object of the present invention is to provide a new molten metal forging die device in which the drive mechanism of the pressure plunger is improved so that an existing press machine can be effectively used for molten metal forging without modifying the press machine for molten metal forging. It is said that

According to the present invention, the present invention has a forging die that includes at least an upper die and a lower die and defines a die cavity by both of the forging die, and the upper die passes through the forging die in the upper and lower directions. A molten metal storage cavity communicating with the mold cavity is provided, the lower mold is provided with a guide hole opening on the upper surface of the lower mold at a position corresponding to the molten metal storage cavity, and an upper part of the molten metal storage cavity is provided with a guide hole for storing the molten metal. A pressurizing plunger that can be inserted into the storage cavity is disposed so as to be vertically movable, and is provided in the guide hole to selectively contact the lower surface of the upper mold to cut off communication between the molten metal storage cavity and the mold cavity. In a molten metal forging mold device in which a counter core is arranged to be movable up and down, the upper die is moved up and down with respect to the upper die base by a clamping cylinder piston device supported on the upper die base attached to the press ram. The pressurizing plunger is supported by a pressurizing cylinder piston device supported on the upper mold table, and the cylinder chambers of each of the mold clamping cylinder piston device and the pressurizing cylinder piston device are This is achieved by means of a molten metal forging die apparatus which is connected to each other at its cylinder end.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

1 to 5 are somewhat exploded cross-sectional views of the molten metal forging die apparatus according to the present invention at various operating steps.

In these figures, 1 is an upper mold, and 2 is a lower mold assembly consisting of a core mold 3 and a horizontal mold 4 arranged in such a manner that it can slide horizontally on the lower mold 3. A mold cavity 5 is defined by the upper mold 1, the core mold 3, and the horizontal mold 4.

The upper mold 1 can be moved up and down in a horizontal position with respect to the upper mold table 7 by a mold clamping hydraulic cylinder-piston device supported on the upper mold table 7 attached to the upper ram 6 of the press machine. It is carried.

In this case, the lowest position of the upper die 1 is set by a stopper portion 71 formed in a part of the upper die base 7.

Each of the mold clamping extraction cylinder piston devices 8 includes a cylinder case 9 defining a sealed cylinder chamber, and a cylinder case 9 which is slidably disposed within the cylinder case and has an upper chamber 9a and a lower chamber 9b inside the cylinder chamber. Piston 1 divided into
0 and a piston rod 12 that is integrally constructed with the piston 10 and protrudes downward from the cylinder case 9. The upper die table 1 is supported by the upper mold table 1.

The upper mold table 1 has a molten metal storage cavity 13 which is a cylindrical space that vertically passes through its center and communicates with the mold cavity 5 at a lower end opening, and the molten metal storage cavity 13 has an upper end opening. Molten metal is poured into the molten metal by an automatic pouring device or the like from a pouring port 14 opened nearby, and inside the molten metal storage cavity 13 there is a pressurizing hydraulic cylinder-piston attached to the upper mold table 7. A pressurizing plunger core 16 carried by the device 15 is fitted so as to be vertically movable.

The pressurizing hydraulic cylinder-piston device 15 includes a cylinder case 17 defining a sealed cylinder chamber, and is slidably disposed within the cylinder case 17 and divides the cylinder chamber into an upper chamber 18a and a lower chamber 18b. The cylinder case 17 is fixed to the upper mold base 7, and the piston rod 20 is configured integrally with the piston 19 and protrudes downward from the cylinder case 17. The pressurizing plunger core 16 is supported at the lower end.

Each of the mold clamping hydraulic cylinder-piston devices 8 has an upper end port 21 at the upper cylinder end of its upper chamber 10a.
and a lower end port 22 at the lower cylinder end of the lower chamber 10b, of which the upper end port 21 is connected to the upper cylinder end of the upper chamber 18a of the pressurizing hydraulic cylinder-piston device 15. The upper end port 23 communicates with the opened upper end port 23 via oil passages 24 and 25, and the lower end port 22 communicates with the lower end port 26 opened at the lower cylinder end portion of the lower chamber 18b of the pressurizing hydraulic cylinder-piston device 15. They are communicated via a passage 27, and constitute a closed oil circulation system between the two cylinder-piston devices.

This oil circulation system, that is, the cylinder chambers of the mold clamping hydraulic cylinder and piston device 8, the cylinder chambers of the pressurizing hydraulic cylinder and piston device 15, and the oil passages 24, 25, and 27 are fully filled with hydraulic oil. has been done.

In the case of this embodiment, coolers 28, 29 are provided in the oil passages 24, 25 in the middle to cool the hydraulic oil flowing through the oil passages 24, 25.

In the case of this embodiment, the pressurizing hydraulic cylinder-piston device 15 is disposed at the center of the lower surface of the lower mold table 7, and each of the mold clamping hydraulic cylinder-piston devices 8 is connected to the pressurizing hydraulic cylinder-piston device. They are spaced around the outer periphery of 15.

Further, the ratio of the total pressure receiving area of the piston 11 of the mold clamping hydraulic cylinder/piston device 8 to the pressure receiving area of the piston 19 of the pressurizing hydraulic cylinder/piston device 15 is the mold matching surface (lower surface) of the upper mold 1. Projected area and pressure plunger 1
It may be made equal to the ratio of the pressure receiving (pressurizing) area of 6.

On the other hand, the core mold 3 of the lower mold assembly 2 is moved to the press table 3 of the press machine in correspondence with the upper mold 1 by means of a lower mold table 30.
It is fixedly placed on 1.

A guide hole 32 is formed in the skeleton mold 3 and extends vertically through the center of the molten metal storage cavity 13 so as to open toward the lower end opening of the molten metal storage cavity 13. It is arranged so that it can be moved freely.

This counter core 33 is larger than the inner diameter of the molten metal storage cavity 13, and its upper surface contacts the lower surface (bar tension surface) of the upper mold 1 to constitute a substantial bottom surface of the molten metal storage cavity 13, and at the same time moves up and down. Communication between the molten metal storage cavity 13 and the mold cavity 5 is cut off.

Further, the counter core 33 has a lower end portion that is connected to the core mold 3.
It is configured to move up and down together with a substantially horizontal plate 34 disposed within a hollow portion formed on the lower side of the holder.

The plate 34 is urged downward by a compression coil spring 35 provided between the plate 34 and the lower mold stand 30 to bring the counter core 33 to a lowered position where the molten metal storage cavity 13 and the mold cavity 5 communicate with each other. On the other hand, the plate 34
When the plate 34 is held in the upper position against the action of the compression coil spring 35 by a movable spacer element 36 selectively inserted between the upper surface of the lower die table 30 and the upper surface of the lower die table 30, the communication is closed. The counter core 33 is brought to a raised position for blocking.

The movable spacer element 36 is biased by a compression coil spring 37 in a direction to be inserted between the plate 4 and the upper surface of the lower mold table 30, and has a hole 37 with one surface inclined. After the mold clamping is completed, a roller 40 carried by the tip of a pole 39 hanging down from the upper die table 7 is inserted into the hole 38 while hitting the inclined surface, so that the movable spacer element 36 is connected to the compression coil. It is adapted to be moved in a direction away from the plate 34 against the action of the springs 37.

Further, the lower die table 30 includes a knockout plate 41, and the knockout plate 41 is connected to the plate 34.
It supports a knockout pin 42 which passes through the coronal mold 3 vertically and can freely protrude into the mold cavity 5, and is connected to a knockout drum 43 built into the press table 31. It can be moved up and down.

The upper surface of the knockout plate 41 can come into contact with the lower surface of the plate 34, and is configured to rise together when the plate 34 is in the lower position.

Next, the order of molten metal forging using the molten metal forging die device having the structure as described above will be explained.

First, as shown in FIG. 1, the upper mold 1 is raised together with the upper mold table 7 by the upper ram 6, and in the released state, the mold is heated, cleaned, and a release agent is applied.After this, as shown in FIG. The upper mold 1 is lowered together with the upper mold table 7 by the upper ram 6, and its lower surface is joined to the upper surface of the lower mold assembly 2, thereby performing so-called mold clamping.

In this mold clamping state, the movable spacer element 36 is inserted between the plate 34 and the lower mold stand 30, and the counter core 33 is lifted together with the plate 34, and this is the upper mold 1.
The lower end opening of the molten metal storage cavity 13 is closed by contacting the lower surface, and each piston 11 of the mold clamping hydraulic cylinder-piston device 8 is caused by the weight of the upper mold 1 to cause the upper mold 1 to close the stopper part 7. ', on the other hand, the piston 19 of the pressurizing hydraulic cylinder-piston device 15 is located in the upper position, lifting the pressurizing plunger core 16 to the raised position.

In this mold clamping state, a predetermined amount of molten metal is poured into the molten metal storage cavity 13 from the pouring port 14, and when the molten metal pouring is completed, the upper ram 6 is lowered again.

Then, the upper mold 1 hits the lower mold assembly 2 and is prevented from descending any further, so that the upper mold table 7 descends while decreasing the volume of the upper chamber 10a of the hydraulic cylinder-piston device 8 for clamping. become.

As the volume of the upper chamber 10a decreases, the upper chamber 10a
The hydraulic oil inside is sent under pressure from the upper end port 21 to the upper chamber 18a of the pressurizing hydraulic cylinder-piston device 15 through the oil passages 24, 25 and the upper end port 23, and acts on the piston 19 and the pressurizing plunger core 16 together with the piston rod 20. is lowered into the pouring storage cavity 13.

At this time, as the upper mold table 7 further descends, the pole 3
A roller 40 carried by 9 pulls the movable spacer element 36 away from the plate 34.

Then, the plate 34 descends with the counter core 33 onto the upper surface of the lower mold table 30 by the action of the compression coil spring 35, opening the lower end opening of the molten metal storage cavity 13 and communicating it with the mold cavity 5. Become.

Therefore, the molten metal that has been injected into the molten metal storage cavity 13 is filled into the mold cavity 5 from the lower side.

While the press ram 6 continues to descend, hydraulic oil is sequentially sent from the upper chamber 10a of the mold line hydraulic cylinder piston device 8 to the upper chamber 18'a of the pressurizing hydraulic cylinder-piston device 15, and the pressurizing hydraulic cylinder piston The hydraulic oil filled in the lower chamber 10b of the device 15 is sent through the oil passage 27 into the lower chamber 10b of the mold clamping hydraulic cylinder-piston device 8, and the pressurizing plunger core 16 is lowered.

Hydraulic cylinder for pressurization - piston 19 of piston device 15
Since the pressure-receiving area of is set smaller than the total pressure-receiving area of the pistons 11 of the plurality of mold clamping hydraulic cylinder-piston devices 8, the pressurizing plunger core 16 naturally moves upward by the above-mentioned pressure area ratio. It descends faster than ram 6, and the same can be said about its stroke.

As shown in FIG. 3, the molten metal in the molten metal storage cavity 13 is filled into the mold cavity 5, and the pressurized plunger core 16 is filled with the molten metal in the molten metal storage cavity 13.
comes into contact with the upper surface of the molten metal remaining in the cavity 13, pressurizes it, and prevents the pressurizing plunger core 16 from descending, the pressurizing force becomes high and the mold cavity 5 is filled with the molten metal. The next step is to pressurize and solidify the molten metal.

After a certain period of time has elapsed and the solidification of the molten metal is completed, the upper mold 1 is raised by the upper ram 6.

Then, during the rising process, the weight of the upper mold 1 acts on the piston 11, causing it to descend within the cylinder case 8, and as a result, the hydraulic fluid in the lower chamber 10b is transferred to the pressurizing hydraulic cylinder-piston device. 15 is filled in the lower chamber 18b, and at the same time, the hydraulic oil in the upper chamber 18a is sent to the upper chamber 10a of the mold clamping hydraulic cylinder-piston device 8,
The pressurizing plunger core 16 is raised and returned to its original position.

The upper mold 1 continues to operate as described above until its descent is prevented by the stopper portion 7' of the upper mold table 7.

Then, as shown in FIG. 4, when the upper mold 1 is separated from the lower mold assembly 2 and the horizontal mold 4 is released to the outside to complete mold release, the knockout plate 41 and the plate 34 are raised together by the knockout ram 43. The molten metal forged product remaining on the lower mold assembly 2 is lifted up by the knockout pin 42 and the counter core 33 and knocked out.

At this time, the roller 40 is separated from the movable spacer element 36 as the ram 6 rises, and the movable spacer element 36 is in a state where it can move to the left in the figure by the compression coil spring 37, so that the plate 34 becomes the knockout plate as described above. 4
1, as shown in FIG. You will have to wait for work.

The knockout pin 42 and the knockout plate 41 are connected to the movable spacer element 36 by the knockout ram 43.
be lowered to its original position without being disturbed.

According to the molten metal forging mold device of the present invention as described above, there is no need to specially supply hydraulic pressure to the cylinder piston device for driving the pressurizing plunger, and the cylinder piston device is driven by energy for mold clamping. As a result, molten metal forging can be performed using the simplest and cheapest hydraulic press machine equipped with a main ram (upper ram) for mold clamping, increasing flexibility in the presses used and reducing equipment investment and running costs. Furthermore, by attaching a plurality of mold devices to a press machine, multi-cavity molten metal forging can be performed relatively easily, and productivity can be improved.

In addition, since the mold clamping force and the pressurizing force are linked to each other by the mold clamping cylinder piston device and the pressurizing cylinder piston device, there is always no excess energy loss, and the mold clamping force increases in accordance with the generation of Calo pressure. Further, since the pressure plunger speed is added to the press ram speed multiplied by the pressure receiving area ratio of each piston of the mold clamping cylinder piston device and the pressurizing cylinder piston device, rapid filling and pressurization can be performed.

The pressurized plunger speed obtained in this way is not realistic when piping is done using an external hydraulic power source as in the past, even considering the discharge amount and piping resistance.

In addition, since the molten metal forging mold device according to the present invention completes the sequence of mold clamping and pressurization in the mold device itself, it is possible to perform the sequence for each operation using a conventional double-acting press machine. In comparison, the cycle time can be shortened and the number of failed parts to be inspected is reduced.

Further, as in the above-described embodiment, the counter core is urged downward by a spring or the like, and the movable spacer element controlled by the lowering or raising of the upper die table moves the counter core to a predetermined position against the spring. If it is configured to be lifted into position, the sequence of mold clamping, pouring, pressurizing, and mold opening can be completed by the mold device itself, making it possible to further simplify the control system on the press machine side.

[Brief explanation of drawings]

FIGS. 1 to 5 are cross-sectional views showing, in a somewhat simplified manner, each operation process when performing molten metal forging using the molten metal forging die apparatus according to the present invention. 1. Upper mold, 2. Lower mold assembly, 3.
...Lower phase type, 4...Horizontal type, 5...
・Mold cavity, 6... Upper ram, 7...
...Upper mold stand, 8...Hydraulic cylinder-piston device for mold clamping, 9...Cylinder case, 10a...
...Upper chamber, 10b...Lower chamber, 11...
... Piston, 12 ... Piston rod,
13... Molten metal storage cavity, 14...
・Pouring port, 15... Pressurizing hydraulic cylinder-piston device, 16... Pressurizing plunger core, 17
...... Cylinder case, 18a... Upper chamber, 18b... Lower chamber, 19... Piston, 20... Piston rod, 21. ...
...Top end port, 22...Bottom end port, 23.
...Top end port, 24゜25...Oil passage,
26... lower end port, 27... oil path,
2B, 29...Cooler, 30...Lower mold stand, 31...Press table, 32...
・Guide hole, 33... Counter core, 34...
... Plate, 35 ... Compression coil spring, 3
6... Movable spacer element, 37... Compression coil spring, 38... Hole, 39...
Port, 40...Roller, 41...Knockout plate, 42...Knockout pin, 43...Knockout ram.

Claims (1)

[Scope of Claims] 1. A forging die including at least an upper die and a lower die and defining a die cavity by the two dies, the upper die passing through the forging die vertically and forming the die cavity on the lower side thereof. a molten metal storage cavity communicating with the molten metal storage cavity, a guide hole opening in the upper surface of the lower mold at a position corresponding to the molten metal storage cavity of the lower mold; A pressurizing plunger that can be inserted into the mold cavity is disposed so as to be vertically movable, and a counter core that selectively contacts the lower surface of the upper mold to cut off communication between the molten metal storage cavity and the mold cavity is disposed in the guide hole. In a molten metal forging mold device that is arranged to be vertically movable, the upper die is movable up and down with respect to the upper die table by a mold clamping cylinder piston device supported on the upper die table attached to the press ram. The pressurizing plunger is supported by a pressurizing cylinder piston device supported on the upper die table, and the cylinder chambers of each of the mold clamping cylinder piston device and the pressurizing cylinder piston device have respective cylinder ends. A molten metal forging die device characterized in that the parts are in communication with each other. 2. In the molten metal forging mold device according to claim 1, the ratio of the pressure receiving area of the piston of the mold clamping cylinder piston device to the pressure receiving area of the piston of the pressurizing cylinder piston device is equal to A molten metal forging mold device characterized in that the projected area of the mold mating surface is equal to the ratio of the pressure receiving area of the pressurizing plunger.