JPS6354465B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Purpose of the Invention [Field of Industrial Application] This invention relates to a die forging device, particularly a high temperature die forging or constant temperature die forging device that heats a die during forging. .

Constant-temperature die forging, which heats the die itself along with the workpiece to be forged to the same temperature as the workpiece, or high-temperature die forging, which heats the die to a slightly lower temperature, is used for aerospace equipment parts, etc. For the purpose of forming, it is being used for forming nickel-based alloys or titanium-based alloys.

[Prior art] Conventional high temperature die forging or constant temperature die forging apparatus 10
1, as shown in FIG. 3, an upper mold 102 and a lower mold 10.
3, the upper mold 102 is fixed to a press frame 105 via a drive device 104, and the press frame 1
05 is guided by a guide post 106 and driven up and down, and as the press frame 105 moves up and down, the upper die 102 moves up and down. The drive devices 104 each have a pressure plate 1 integrally fixed to a press frame 105.
07, a heat insulating plate 108, and a water cooling plate 109.

On the other hand, the lower mold 103 is fixedly supported by a press frame 112 at a fixed position via a fixing device 111. The fixing device 111 includes a pressure plate 113 and a heat insulating plate 11
4 and a water cooling plate 115. Upper mold 10
2 and the lower mold 103 are heated by heaters 116 and 117.

[Problems to be Solved by the Invention] In the conventional forging apparatus for high temperature or constant temperature die forging having such a configuration, during forging, the upper die 1
02 and the lower mold 103 are equipped with heaters 116 and 1, respectively.
The upper mold 10
2. Since the lower mold 103 is fixed to the pressure plates 107, 113, the heat applied to the upper and lower molds 102, 103 flows through the pressure plates 107, 113 to the water-cooled plates 109, 115, and the heat insulating material such as ceramic Even if the plates 108, 114 are sandwiched between the pressure plates 107, 113 and the water-cooled plates 109, 115, a large amount of energy is required to heat the upper and lower molds 102, 103. There is a problem in that the molds 102 and 103 tend to have a temperature difference, and temperature distribution also tends to occur within each mold, resulting in the inability to obtain the desired processing conditions, and it is desirable to develop a technology to deal with this problem. It is rare.

This invention was made in view of the above circumstances, and is a die forging that can reduce the energy required for heating a die in high-temperature die forging or constant temperature die forging, and can heat the die uniformly. The purpose is to provide a device.

(B) Structure of the Invention [Means for Solving the Problem] Corresponding to this object, the die forging device of the present invention includes a die, a drive device capable of pressing the die, and a drive device located around the die and configured to press the die. The device is equipped with a heater attached to the device, and the mold is connected to the drive device so as to be able to come into contact with and separate from the drive device via an extensible spring. The invention is characterized in that the separated state is maintained by.

Hereinafter, details of the present invention will be explained with reference to the drawings showing one embodiment.

In FIG. 1, 1 is a die forging device. The die forging device 1 includes an upper die 2 and a lower die 3. Upper mold 2
is connected to the drive device 4 so as to be relatively displaceable,
The drive device 4 is fixed to the press frame 5. The press frame 5 can be guided by a guide post 6 and driven up and down. The drive device 4 includes a pressure plate 7, a heat insulating plate 8 made of ceramic heat insulating material, etc., and a water cooling plate 9.
The pressure plate 7 is fixed to the heat insulating plate 8 by bolts 21, and the heat insulating plate 8 is fixed to the heat insulating plate 8 by bolts 22.
It is fixed to the water cooling plate 9 by. The drive device 4 is integrally fixed to the press frame 5.

On the other hand, the lower mold 3 is connected to and elastically supported by a drive device 11 so as to be relatively displaceable, and the drive device 11 is fixed to a press frame 12. The press frame 12 is in a fixed position, and the guide post 6 is erected from the press frame 12. The drive device 11 consists of a pressure plate 13, a heat insulating plate 14 made of ceramic heat insulating material, etc., and a water cooling plate 15. The pressure plate 13 is connected to the heat insulating plate 14 by bolts 23.
Further, the heat insulating plate 14 is fixed to the water cooling plate 15 by bolts 24. The drive device 11 is integrally fixed to the press frame 12.

Further, a heater 16 is disposed at a fixed position on the side of the upper mold 2, and a heater 17 is disposed at a fixed position on the side of the lower mold 3.

As described above, the upper die 2 and the pressure plate 7 are configured to be relatively movable. That is, the upper mold 2 loosely fits into a connecting rod 25 fixed vertically downward from the pressure plate 7, and the upper mold 2 is movable up and down along the connecting rod 25. A spring 26 is installed between the upper die 2 and the pressure plate 7.
is provided, and the upper mold 2 is normally in a lowered position separated from the pressure plate 7 by a gap 27 due to its own weight and the pressing force of the spring 26. The lowest position of the upper die 2 is defined by a stopper 28 screwed onto the tip of the connecting rod 25.

Further, as described above, the lower mold 3 and the pressure plate 13 are configured to be relatively movable. That is, pressure plate 1
The lower mold 3 is attached to the connecting rod 31 fixed vertically upward from the lower mold 3.
is loosely fitted, and the lower mold 3 is movable up and down along the connecting rod 31. A spring 32 is disposed between the lower mold 3 and the pressure plate 13, and normally the lower mold 3 is moved against the pressure plate 13 by the pressing force of the spring 32 against its own weight.
It is in a raised position separated from and with a gap 33 maintained therebetween.
The highest position of the lower die 3 is defined by a stopper 34 screwed onto the tip of the connecting rod 31.

[Function] When performing high-temperature die forging or constant temperature die forging on a workpiece in the die forging apparatus 1 configured as described above, the workpiece 100 is placed on the lower die 3 (this (Also, the gap 33 is maintained between the lower mold 3 and the pressure plate 13), and in this state, the heater 16,
17, the upper die 2, the lower die 3 and the workpiece 10
0, or the workpiece 100 is heated with a separate heating device, and the heaters 16, 1
7 to heat the upper mold 2 and lower mold 3, and when they reach a predetermined temperature, the workpiece 100 is conveyed and the lower mold 3 is heated.
Place it on top.

When heating is completed, the upper press frame 5 is lowered. Due to this lowering, the upper mold 2 also lowers, and the upper mold 2
comes into contact with the workpiece 100. When the upper mold 2 comes into contact with the workpiece 100, the lowering of the upper mold 2 is stopped, but the drive device 3 continues to lower against the pressing force of the springs 26 and 32. During this time, gaps 27, 33
gradually decreases. Next, when the gaps 27 and 33 are completely eliminated, the upper mold 2 and the pressure plate 7 come into direct contact,
In addition, the lower die 3 and the pressure plate 13 are in direct contact with each other, and the pressing force of the press frames 5 and 12 is directly applied to the upper die 2 and the lower die 3.
Then, die forging of the workpiece 100 is performed. When the die forging of the workpiece 100 is completed, the press frame 5 rises and returns to the initial position where the gaps 27 and 33 are maintained.

(c) Effects of the invention In the die forging device configured as described above,
Heaters 16, 1 for upper and lower molds prior to die forging
7, the upper mold and lower mold are heated by the pressure plate 7,
Since the molds are floating in space with gaps 27 and 33 kept between them, there is almost no heat transfer from the upper and lower molds through the pressure plate, so heating is required to raise the temperature of the upper and lower molds to the required temperature. The temperature can be low, the heating time can be shortened, and the temperature difference between the upper mold and the lower mold can be reduced.

Figure 2 shows the changes in temperature measured at point A of the upper mold 2, point B of the lower mold 3, and point C of the heaters 16 and 17, and shows the changes even when the temperature at point C is low. , it can be seen that the temperature rises satisfactorily without causing a large temperature difference between points A and B. In contrast, FIG. 4 shows point A of the upper die 102, point B of the lower die 103, and the heater 11 in a conventional die forging device.
The temperature was measured at point C of 6,117 and the change was shown, but even if the temperature was raised at point C, the temperature at points A and B did not rise well.
It can be seen that there is a large temperature difference between point and point B.

As is clear from this comparison, the die forging apparatus of the present invention realizes a reduction in the energy required for heating the die and uniform heating of the die.

[Brief explanation of the drawing]

FIG. 1 is an explanatory longitudinal cross-sectional view of a die forging apparatus according to an embodiment of the present invention, FIG. 2 is a graph showing temperature changes within the die forging apparatus, and FIG. 3 is an explanatory longitudinal cross-sectional view of a conventional die forging apparatus. , and FIG. 4 are graphs showing temperature changes within a conventional die forging device. DESCRIPTION OF SYMBOLS 1... Die forging device, 2... Upper die, 3... Lower die, 4... Drive device, 5... Press frame, 11... Drive device, 12...
Press frame, 16... heater, 17... heater, 25...
Connecting rod, 26... Spring, 27... Gap, 31...
Connecting rod, 32...Spring, 33...Gap, 100
...Workpiece.

Claims (1)

[Claims] 1 comprising a mold, a driving device capable of pressing the mold, and a heater located around the mold and attached to the driving device, and capable of bringing the mold into contact with and separating from the driving device via an extensible spring A die forging apparatus, characterized in that the die and the driving device are connected to each other, and are configured such that the die and the driving device are normally maintained in the separated state by the pressing force of the spring.