JP5845135B2 - Forging die equipment - Google Patents

Description

  The present invention relates to a forging die apparatus used for high-temperature forging (hot die forging) of difficult-to-work metal materials such as titanium alloys and Ni-based alloys.

  In recent years, high-temperature forging of difficult-to-work metal materials such as titanium alloys and Ni-based alloys has been performed using a mold. As a forging die device used for high temperature forging, in order to heat a die, conventionally, for example, a plurality of heater insertion holes are formed in each of an upper die and a lower die, and each of these heaters is inserted. A forging die apparatus is known in which an upper die and a lower die are heated by a rod-shaped sheathed heater (also referred to as “cartridge heater”) inserted into a hole. For example, Patent Documents 1 and 2 disclose this type of forging die apparatus.

JP 2004-337935 A (paragraph [0032], FIG. 3) Japanese Patent Laid-Open No. 11-77214 (paragraph [0010], FIG. 2)

  However, the above-described conventional forging die apparatus includes a sheathed heater (heating element) incorporated in each die as a die heating means for heating the upper and lower dies, but the forging material Prior to setting the mold, there is a problem that it is difficult to make the temperature of the mold molding surface substantially uniform over the entire mold molding surface depending on the shape of the mold molding surface. In addition, when heating with a sheathed heater built into each mold, it takes a long time to raise the temperature of the mold molding surface to the required temperature, or when multiple products are continuously forged. In addition, the temperature distribution on the mold forming surface has hindered productivity.

  Then, the subject of this invention is provided with the upper and lower metal mold | die and the metal mold | die heating means which heats these, In the metal mold | die for forging used for the high temperature forging of the forging raw material, It is an object of the present invention to provide a forging die device that can heat each die forming surface of upper and lower dies by a die forming surface heating means prior to setting.

  In order to solve the above problems, the present invention takes the following technical means.

The invention according to claim 1 is a forging die apparatus for use in high-temperature forging of a forging material, comprising an upper die and a lower die, and a die heating means for heating the upper and lower dies. Insertion and retraction is possible between the upper and lower molds, and prior to setting the forging material on the molds, the mold molding surface heating means for heating each mold molding surface of the upper and lower molds , The mold molding surface heating means is an infrared heater, and this infrared heater is heated correspondingly to each mold molding surface in order to heat the entire mold molding surface so that the temperature is substantially uniform. The forging die device is characterized in that the infrared radiation amount per unit area of the infrared heater is different .

The invention of claim 2 comprises a die forging device used for high-temperature forging of a forging material, comprising an upper die and a lower die, and a die heating means for heating the upper and lower dies. Insertion and retraction is possible between the upper and lower molds, and prior to setting the forging material on the molds, the mold molding surface heating means for heating each mold molding surface of the upper and lower molds, The forging die characterized in that the die molding surface heating means is an infrared heater, and includes a masking member for suppressing a temperature rise at a required portion of each mold molding surface due to radiant heat from the infrared heater. Device .

The invention of claim 3 comprises a die forging device used for high-temperature forging of a forging material, comprising an upper die and a lower die, and a die heating means for heating the upper and lower dies. Insertion and retraction is possible between the upper and lower molds, and prior to setting the forging material on the molds, the mold molding surface heating means for heating each mold molding surface of the upper and lower molds, The mold molding surface heating means is an infrared heater, and this infrared heater has a surface shape corresponding to the shape of each mold molding surface having a concavo-convex portion, and is opposed to the surface of the infrared heater having this surface shape. The forging die apparatus is characterized in that the distance to each die molding surface is maintained within a predetermined range over the entire die molding surface .

According to the forging die apparatus of claim 1, in addition to the die heating means, the die forming for heating the die forming surface which can be inserted and retracted between the upper and lower dies and is easily lowered in temperature. Since the surface heating means is provided, the mold forming surface heating means is positioned between the upper and lower molds prior to setting the forging material into the mold, and is retracted after heating, so that the upper and lower molds are Each mold forming surface can be heated, for example, to a required temperature over the entire mold forming surface. As a result, a forged product that faithfully reflects the shapes of the mold forming surfaces of the upper and lower dies can be obtained, and the accuracy of the size and shape of the forged product can be improved.
In addition, since a radiant heating type infrared heater is provided as a mold molding surface heating means, the mold molding surface can be heated in a non-contact manner without causing rough skin damage or the like on the mold molding surface. .
In addition, when heating the mold forming surface, for example, the infrared radiation amount (heater unit area) of a portion having a large distance to the mold forming surface facing the infrared heater or a portion facing the periphery of the mold forming surface. The upper and lower molds are configured by configuring the infrared heater so that the hit is larger than the infrared radiation amount of the part where the distance to the mold molding surface is small or the part facing the center of the mold molding surface. Each mold forming surface can be heated so that the temperature is substantially uniform over the entire mold forming surface.

According to the forging die apparatus of claim 2, in addition to the die heating means, the die forming for heating the die forming surface which can be inserted and retracted between the upper and lower dies and is easily lowered in temperature. Since the surface heating means is provided, the mold forming surface heating means is positioned between the upper and lower molds prior to setting the forging material into the mold, and is retracted after heating, so that the upper and lower molds are Each mold forming surface can be heated, for example, to a required temperature over the entire mold forming surface. As a result, a forged product that faithfully reflects the shapes of the mold forming surfaces of the upper and lower dies can be obtained, and the accuracy of the size and shape of the forged product can be improved.
In addition, since a radiant heating type infrared heater is provided as a mold molding surface heating means, the mold molding surface can be heated in a non-contact manner without causing rough skin damage or the like on the mold molding surface. .
In addition, for example, by arranging a masking member so as to cover the central portion where temperature decrease due to heat radiation is less likely to occur compared to the peripheral portion on the mold forming surface, the central portion of the mold forming surface due to radiant heat from the infrared heater is provided. Suppressing the temperature rise, preventing the central part from being overheated, and heating the mold molding surfaces of the upper and lower molds so that the temperature is substantially uniform over the entire mold molding surface Can do.

According to the forging die apparatus of claim 3, apart from the die heating means, it is possible to insert and retreat between the upper and lower dies, and die molding for heating the die molding surface which is easy to decrease in temperature. Since the surface heating means is provided, the mold forming surface heating means is positioned between the upper and lower molds prior to setting the forging material into the mold, and is retracted after heating, so that the upper and lower molds are Each mold forming surface can be heated, for example, to a required temperature over the entire mold forming surface. As a result, a forged product that faithfully reflects the shapes of the mold forming surfaces of the upper and lower dies can be obtained, and the accuracy of the size and shape of the forged product can be improved.
In addition, since a radiant heating type infrared heater is provided as a mold molding surface heating means, the mold molding surface can be heated in a non-contact manner without causing rough skin damage or the like on the mold molding surface. .
In addition, when heating the mold forming surface having the concavo-convex portion, the infrared heater has a heater surface shape corresponding to the shape of the mold forming surface, and the distance from the heater surface to the opposing mold forming surface is a metal distance. Since it is configured to have a predetermined range, for example, substantially constant over the entire mold forming surface, the mold forming surface can be heated so that the temperature is substantially uniform over the entire mold forming surface. Here, the predetermined range includes a case where the interval distance from the heater surface to the opposing mold forming surface varies as long as the desired heating uniformity can be achieved.

It is sectional drawing which shows schematically the structure of the die apparatus for forging by one Embodiment of this invention. It is sectional drawing which shows schematically the structure of the die apparatus for forging by another embodiment of this invention. It is sectional drawing which shows roughly the structure of the die apparatus for forging by another embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing a configuration of a forging die device according to an embodiment of the present invention.

  In FIG. 1, 10 is a disk-shaped upper mold, and 20 is a disk-shaped lower mold. In the present embodiment, the upper and lower molds 10 and 20 are for die forging a disk-shaped forged product having uneven portions. In the present embodiment, the product molding surface 10a of the upper mold 10 and the product molding surface 20a of the lower mold 20 both have the same shape, and have an uneven portion in a circular shape in plan view. The product molding surfaces 10a and 20a have a convex portion at the center in the radial direction and a concave portion at the periphery thereof.

  First, the upper mold 10 side will be described. As shown in FIG. 1, the upper die side of the forging die device 1 includes an upper die 10, a disk-shaped die plate 14 that supports the upper die 10, and an outer peripheral portion of the upper die 10. An annular die holder 12 that surrounds and holds the upper mold 10 is arranged so that the surface opposite to the product molding surface 10a of the upper mold 10 is in contact with the upper mold 10 held by the die holder 12. A disk-shaped heater plate 11 for heating the mold 10 and a disk-shaped heat insulating plate 13 disposed between the heater plate 11 and the die plate 14 are provided. At the time of forging, the upper die 10 preheated in a heating furnace is accommodated inside the die holder 12 and is fixed to the die holder 12 using, for example, a pin (not shown).

In the heater plate 11, a plurality of, in the illustrated example, two annular grooves are concentrically spaced from each other on the surface of the upper mold 10 that is in contact with the bottom surface (the surface opposite to the product molding surface 10a). It is provided in the shape. In these annular grooves of the heater plate 11, sheathed heaters 11a ₁ and 11a ₂ which are resistance heaters that generate heat by resistance heating are arranged in close contact with the groove walls. The lead wires of the sheathed heaters 11a ₁ and 11a ₂ are drawn out of the heater plate 11 through the lead wire grooves (not shown) of the heater plate 11.

  Reference numeral 60 denotes a base plate fixed to an elevating side member (called a ram or a slider) of a press machine (not shown). A die plate 12, a heat insulating plate 13, a heater plate 11, and a die holder 12 are integrally attached to the base plate 60 using a fastener 15 made of a tie rod, a nut, or the like.

  Next, the lower mold 20 side will be described. As shown in FIG. 1, the lower die side of the forging die device 1 includes a lower die 20, a disk-shaped die plate 24 that supports the lower die 20, and an outer peripheral portion of the lower die 20. An annular die holder 22 that surrounds and holds the lower mold 20 is disposed so that the surface opposite to the product molding surface 20 a of the lower mold 20 is in contact with the lower mold held by the die holder 22. A disk-shaped heater plate 21 for heating the mold 20 and a disk-shaped heat insulating plate 23 arranged between the heater plate 21 and the die plate 24 are provided. During forging, the lower mold 20 preheated in a heating furnace is housed inside the die holder 22 and is fixed to the die holder 22 using, for example, a pin (not shown).

The heater plate 21 has the same configuration as the heater plate 11 for the upper mold, and the sheathed heaters 21a ₁ and 21a ₂ are concentrically arranged and incorporated. The heater plates 11 and 21 constitute mold heating means for heating the upper and lower molds 10 and 20.

  Reference numeral 70 denotes a base plate fixed to a fixed side member (bolster) of the press machine. A die plate 22, a heat insulating plate 23, a heater plate 21, and a die holder 22 are integrally attached to the base plate 70 using a fastener 25 made of a tie rod, a nut, or the like. In addition, in FIG. 1, the knockout mechanism for taking out a forging product etc. is abbreviate | omitting illustration.

  The upper and lower molds 10 and 20 are made of, for example, a Ni-base heat resistant alloy. The heater plates 11 and 21 are made of, for example, a Ni-base heat resistant alloy. The die holders 12 and 22 are made of, for example, hot tool steel. The said heat insulation plates 13 and 23 consist of fireproof bricks, for example. The die plates 14 and 24 are made of, for example, carbon steel.

  As shown in FIG. 1, the forging die device 1 of the present embodiment can be inserted and retracted between upper and lower dies 10, 20, and prior to setting the forging material into the dies 10, 20. As a mold molding surface heating means for heating the mold molding surfaces 10a and 20a of the upper and lower molds 10 and 20, a radiation heating method capable of heating the mold molding surfaces 10a and 20a in a non-contact manner. And an infrared heater 31 as an example. In this embodiment, the infrared heater 31 is a far infrared heater that radiates far infrared rays.

  The infrared heater 31 is coupled to a driving device (not shown) through a long and thin bar-shaped support member 40. This driving device inserts the infrared heater 31 into a predetermined position above the mold forming surface 20a of the lower mold 20 before the upper mold 20 is lowered by the press machine and brought close to the lower mold 20. FIG. After the mold forming surfaces 10a and 20a are heated by the infrared heater 31 in the state shown in FIG. 2, the upper mold 20 is raised by a press to set the forging material on the mold forming surface 20a of the lower mold 20. After that, the infrared heater 31 is retracted to the outside of the molds 10 and 20. This drive device has a function of moving the infrared heater 31 forward / backward and moving up / down, and is mounted on, for example, a bolster of a press machine.

  The infrared heater 31 has a circular thin plate shape as a whole, and includes a circular heater central portion 31a and an annular thin plate-shaped heater peripheral portion 31b connected to the heater central portion 31a. The central portion 31a and the heater peripheral portion 31b are configured so as to have different infrared radiation amounts (radiant divergence amounts) per heater unit area. In the present embodiment, the heating elements (ceramics and metals) having different infrared radiation amounts. It consists of an oxidized surface). The heater peripheral portion 31b positioned opposite to the concave portion located in the peripheral portion of the mold forming surfaces 10a and 20a is the heater central portion positioned opposite to the convex portion located in the central portion of the mold forming surfaces 10a and 20a. It is composed of a heating element having a larger amount of infrared radiation per heater unit area than 31a.

  In the forging die apparatus 1 configured as described above, the upper and lower dies 10 and 20 are preheated to a required temperature in a heating furnace and then guided to a press machine in a die opening state, and the die back surface is a heater. It fits in the die holders 12 and 22 in contact with the plates 11 and 21, and is fixed to the die holders 12 and 22 using pins or the like (not shown), for example. Prior to mounting the molds 10 and 20, the heater plates 11 and 21 are heated to a required temperature. In addition, it is desirable that the infrared heater 31 in the retracted position is previously turned on by supplying power so that a normal output can be output in a short time from the start of irradiation.

  Next, the infrared heater 31 is inserted into a predetermined position above the mold forming surface 20a of the lower mold 20 by the drive device, and the upper mold 20 is lowered to approach the lower mold 20 as shown in FIG. In this state, the mold molding surfaces 10a and 20a are heated by the infrared heater 31.

  In the upper and lower molds 10 and 20, the temperature at the periphery of the mold is likely to decrease due to heat radiation as compared to the center of the mold. For this reason, in this forging die apparatus 1, the infrared radiation amount is large with respect to the recessed part located in the peripheral part by the said infrared heater 31 compared with the convex part located in the center part in the metal mold | die molding surfaces 10a and 20a. The mold molding surfaces 10a and 20a are heated so as to be. Thereby, combined with the heating of the molds 10 and 20 by the heater plates 11 and 21 from the mold back side, the mold forming surfaces 10a and 20a are heated to a required temperature (for example, a forging material heated in a heating furnace). The temperature can be heated so that the temperature is substantially uniform over the entire molding surface.

  After heating the mold forming surfaces 10 a and 20 a by the infrared heater 31, the upper mold 20 is raised to set the forging material heated to the required temperature in the heating furnace on the mold forming surface 20 a of the lower mold 20. After that, the infrared heater 31 is retracted out of the molds 10 and 20 by the driving device. Next, the forging material is set on the mold forming surface 20a of the lower mold 20, and the upper mold 20 is lowered to perform high-temperature forging of the forging material with the molds 10, 20.

  Thus, in addition to the heater plates 11 and 21 (mold heating means as the main heating means) for heating the upper and lower molds 10 and 20, an infrared heater 31 (auxiliary heater for heating the mold forming surfaces 10a and 20a). In this embodiment, the mold molding surfaces 10a and 20a are heated at a required temperature so that the temperature is substantially uniform over the entire mold molding surface. Accordingly, a forged product that faithfully reflects the shape of the mold forming surfaces 10a and 20a can be obtained, and the accuracy of the size and shape of the forged product can be improved.

  FIG. 2 is a cross-sectional view schematically showing the configuration of a forging die device according to another embodiment of the present invention. Here, in the forging die device 2 according to this embodiment, portions common to the forging die device 1 of FIG. 1 are denoted by the same reference numerals as those in FIG. To do.

  In FIG. 2, 32 is a circular thin plate-shaped infrared heater. Unlike the infrared heater 31, the infrared heater 32 is composed of the same heating element throughout. In this embodiment, the infrared heater 32 is a far infrared heater that radiates far infrared rays. Reference numeral 50 denotes a masking member having a diameter smaller than that of the infrared heater 32 and a circular thin plate shape. The masking member 50 is located between the infrared heater 32 and the mold forming surfaces 10a and 20a, covers the required portions of the mold forming surfaces 10a and 20a, and increases the temperature of the required portions due to radiant heat from the infrared heater 32. It is for suppressing. Examples of the material of the masking member 50 include refractory bricks. In this forging die device 2, in order to suppress the temperature rise of the convex portion located in the center portion of the die molding surfaces 10a and 20a, two masking members 50 for the upper die and the lower die are provided. The infrared heaters 32 are respectively attached to the center portions of both surfaces.

  The infrared heater 32 to which the masking member 50 is attached is positioned between the mold forming surfaces 10a and 20a as shown in FIG. The molding surfaces 10a and 20a are heated. In the forging die device 2, the masking member is provided so as to cover the center portion where the temperature drop due to heat radiation is less likely to occur on the mold forming surfaces 10a and 20a than the peripheral portion and the distance from the infrared heater 32 is small. Therefore, the temperature rise at the center of the mold forming surfaces 10a and 20a due to the radiant heat from the infrared heater 32 is suppressed to prevent the center from being overheated, and heating by the heater plates 11 and 21 is performed. In combination, the mold molding surfaces 10a and 20a can be heated at a required temperature so that the temperature is substantially uniform over the entire mold molding surface.

  FIG. 3 is a sectional view schematically showing a configuration of a forging die device according to another embodiment of the present invention. Here, in the forging die device 3 according to this embodiment, portions common to the forging die device 1 of FIG. 1 are denoted by the same reference numerals as those in FIG. To do.

  In FIG. 3, 33 is a disk-shaped infrared heater. The infrared heater 33 is covered with a shape holding member 33b having a shape imitating a forged product to be forged, and is flexible so as to be in close contact with the entire shape holding member 33b. In this embodiment, far infrared rays are applied. The heater main body 33a radiates, and a circular frame 33c that connects the upper half and the lower half of the heater main body 33a. The frame 33c is fixed to the support member 40. Examples of the material of the shape holding member 33b include refractory bricks. As described above, the infrared heater 33 has a heater surface shape corresponding to the shapes of the mold molding surfaces 10a and 20a so as not to cause a temperature difference in the entire mold molding surface, and faces the heater surface. The distance between the molding surfaces 10a and 20a is configured to be substantially constant over the entire molding surface.

  Then, the infrared heater 33 is positioned between the mold forming surfaces 10a and 20a as shown in FIG. 3 in the same procedure as that of the forging die device 1, and is formed between the mold forming surfaces 10a and 20a. Heat. In this forging die device 3, the infrared heater 33 is configured so that the distance from the heater surface to the opposing die forming surfaces 10a, 20a is substantially constant over the entire die forming surface. Combined with the heating of the molds 10 and 20 by 11 and 21, the mold molding surfaces 10a and 20a can be heated at a required temperature so that the temperature is substantially uniform over the entire mold molding surface. In the forging die apparatus 3, a masking member is provided between the center portions (convex portions) of the mold forming surfaces 10a and 20a and the center portion of the infrared heater 33 opposed to the center portion as necessary. May be provided.

  In addition, in the forging die apparatuses 1 to 3 according to the above-described embodiment, a description will be given of the case where the infrared heaters 31 to 33 heat the mold forming surfaces 10a and 20a so that the temperature is substantially uniform over the entire mold forming surface. However, this invention is not limited to this, It can apply also when providing a required temperature difference between each site | part to a metal mold | die molding surface.

10 ... upper die 10a ... die molding surface 11 ... heater plate 11a _1, 11a 2 _... sheathed heaters 12 ... die holder 13 ... heat insulating plate 14 ... die plate 15 ... fasteners 20 ... lower die 20a ... die molding surface 21 ... heater plate 21a _1, 21a 2 _... sheathed heaters 22 ... die holder 23 ... heat insulating plate 24 ... die plate 25 ... fasteners 31,32,33 ... infrared heaters 40 ... support member 50 ... masking members 60 and 70 ... base plate

Claims (3)

In addition to the upper mold and the lower mold, the mold heating means for heating the upper and lower molds,
In the forging die device used for high-temperature forging of the forging material, insertion and retraction can be performed between the upper and lower dies, and each of the upper and lower dies is set prior to setting the forging material to the die. A mold molding surface heating means for heating the mold molding surface is provided , the mold molding surface heating means is an infrared heater, and the temperature of the infrared heater is substantially uniform over the entire mold molding surface. A forging die apparatus characterized in that, for heating, the infrared radiation amount per unit area of the infrared heater is different corresponding to a portion of each mold forming surface . In addition to the upper mold and the lower mold, the mold heating means for heating the upper and lower molds,
In the forging die device used for high-temperature forging of the forging material, insertion and retraction can be performed between the upper and lower dies, and each of the upper and lower dies is set prior to setting the forging material to the die. A mold molding surface heating means for heating the mold molding surface is provided, and the mold molding surface heating means is an infrared heater, and a temperature rise at a required portion of each mold molding surface due to radiant heat from the infrared heater is suppressed. A forging die apparatus comprising a masking member for carrying out the process . In addition to the upper mold and the lower mold, the mold heating means for heating the upper and lower molds,
In the forging die device used for high-temperature forging of the forging material, insertion and retraction can be performed between the upper and lower dies, and each of the upper and lower dies is set prior to setting the forging material to the die. A mold molding surface heating means for heating the mold molding surface is provided, the mold molding surface heating means is an infrared heater, and the infrared heater has a surface corresponding to the shape of each mold molding surface having an uneven portion. And a distance from the surface of the infrared heater having the surface shape to each of the opposing mold forming surfaces is maintained within a predetermined range over the entire mold forming surface. A forging die apparatus characterized by the above .

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