JP6521369B2 - Hot forging die - Google PatentsHot forging die Download PDF
- Publication number
- JP6521369B2 JP6521369B2 JP2015096235A JP2015096235A JP6521369B2 JP 6521369 B2 JP6521369 B2 JP 6521369B2 JP 2015096235 A JP2015096235 A JP 2015096235A JP 2015096235 A JP2015096235 A JP 2015096235A JP 6521369 B2 JP6521369 B2 JP 6521369B2
- Prior art keywords
- hot forging
- mold piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- 238000005242 forging Methods 0.000 title claims description 71
- 229910045601 alloys Inorganic materials 0.000 claims description 29
- 239000000956 alloys Substances 0.000 claims description 29
- 239000010953 base metals Substances 0.000 claims description 6
- 239000010410 layers Substances 0.000 claims 1
- 239000010950 nickel Substances 0.000 claims 1
- 230000035882 stress Effects 0.000 description 19
- 239000000463 material Substances 0.000 description 15
- 239000002184 metal Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000011800 void material Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000000875 corresponding Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 229910001315 Tool steel Inorganic materials 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000001965 increased Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000009497 press forging Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000002093 peripheral Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910001247 waspaloy Inorganic materials 0.000 description 1
On the other hand, there is a proposal of Japanese Patent Application Laid-Open No. 2014-208379 (patent document 2) proposed by the applicant of the present application as a hot forging die suitable for a large size turbine blade.
As described above, in Patent Document 2, when a defect such as a crack occurs, it is easy to replace the mold piece in that part, but if it is possible to more reliably prevent the occurrence of the crack itself, a large turbine It can be made more suitable as a hot forging die for blades.
An object of the present invention is to provide a hot forging die capable of more reliably preventing cracking of a hot forging die used for manufacturing a large-sized forged blade for a turbine blade. It is to be.
That is, according to the present invention, there is provided a mold for hot forging for a turbine blade, in which an assembly of mold pieces integrally formed by joining a plurality of mold pieces is mounted as a core mold in a base mold. The hot forging die is provided with a die-cut surface in the form of the turbine blade, the die-cut surface is constituted by the plurality of die pieces, and the die-cut surface is in the longitudinal direction in the die-cutting face It is a mold for hot forging in which the plurality of mold pieces are joined so as to be divided obliquely with respect to each other.
Preferably, at least one of the mold piece and the base mold is a hot forging mold in which a working surface side is coated with a Ni-based super heat-resistant alloy layer.
1 to 6 are schematic views showing an example of an assembly of a mold piece used for the hot forging mold according to the present invention, and FIG. 7 is an assembly of the mold piece in the base mold 3. It is a schematic diagram which shows an example of the metal mold | die for hot forgings provided with the body. The working surface of the hot forging die 1 is provided with a die-cut surface 4 in the form of a turbine blade.
The hot forging die 1 for a turbine blade of the present invention is mounted as an insert die in the base die 3 as an assembly of die pieces integrally formed by joining a plurality of die pieces 2. Be done. The hot forging die 1 is provided with a engraved surface 4 in the form of a turbine blade. The hot forging die 1 shown in FIG. 1 is used for the lower die. In order to obtain a desired turbine blade material shape by hot forging, the upper die having a die-cut surface is pressed by the lower mold and the upper die to form a turbine blade material shape.
By the way, the material for a turbine blade formed by hot forging has a shape which is gradually twisted from the root direction toward the wing direction. Therefore, a thrust load is applied to the hot forging die formed into the material for a turbine blade along the twisted shape during hot forging. Therefore, the stress applied to each mold piece can be reduced by providing the mold pieces so as to divide in the direction of the large thrust load in the direction in which the thrust load is applied.
In the assembly of the mold piece 2 shown in FIG. 1, the die-cut surface 4 is divided at an angle of approximately 20 to 60 degrees. According to this shape, it is possible to relieve the stress due to the thrust load and to prevent the breakage of the hot forging die. The assembly of the mold piece 2 shown in FIG. 2 is further divided obliquely with respect to the height direction of the mold piece 2. With this structure, the contact pressure at the time of hot forging can be reduced by increasing the contact area between the mold pieces 2. Therefore, it is advantageous as a hot forging die with a large forging load. The assembly of the mold piece 2 shown in FIG. 3 is obtained by dividing the mold piece 2 into three or more pieces in accordance with the direction and the position to which the thrust load is applied. If large thrust and load are applied at a plurality of positions, the mold piece 2 can be divided into three or more pieces. Moreover, since division | segmentation to three or more will reduce the magnitude | size of one mold piece, it becomes possible to perform overlay welding easily with respect to the striking surface of the metal mold | die for hot forgings. As shown in FIG. 4, a stepped portion 15 may be provided in the middle of the divided surface in the height direction of the mold piece 2. When the step portion is provided, the stress concentration on the corner portion 14 can be prevented by providing the void portion 12 on both sides. In the present invention, as shown in FIG. 5 and FIG. 6, the mold piece 2 does not necessarily have to be divided from the striking surface side to the bottom side, and when the corner 13 and the corner 14 are formed It is desirable to provide 12 simultaneously to relieve stress concentration in the corners 14.
By mounting the assembly of the mold pieces shown in FIGS. 1 to 6 described above in the base mold 3 shown in FIG. 7 as an insert mold, the mold 1 for hot forging can be obtained. .
When a specific representative example is shown, as shown in FIG. 9, a first mold piece (mold piece A) having a corner 13 and a second metal having a corner 14 corresponding to the corner 13 In the joint portion with the mold piece (mold piece B), the gap portion 12 constituted by the chamfered portion 11 is provided. In addition, the "corner part" said by this invention is a convex corner part, and it chamfers and a chamfer is formed. Also, as shown in FIG. 9, “corner” refers to a concave portion (corner 14) to which the corner 13 having the chamfered portion 11 is fitted.
According to the study of the present inventor, if the radius of the curved surface of the corner 14 is 10 mm or more, the fracture of the second mold piece (mold piece B) is performed even when hot forging of several tens of thousands of tons is performed. The effect of suppressing Further, in this case, it is preferable that the shape of the chamfered portion 11 also be a curved surface and be larger than the radius of the curved surface of the corner portion 14.
In addition, the space | gap part 12 of this invention exceeds the dimensional difference at the time of fitting mold piece 2 comrades. For example, L and M shown in FIG. 9 are the height direction L of the gap and the length in the width direction M, and the height L of the gap is approximately 10 to 60 mm and the width M is approximately 10 to 60 mm It is good to assume. The height and width of the gap 12 formed by the chamfered portion 11 and the corner portion 14 are the effect of reducing the stress applied to the periphery of the corner portion 14 during hot forging, and the first mold piece (mold piece A) It may be determined in consideration of the clamping force with the second mold piece (mold piece B). In the case of forming a radius at a corner, the height and the width of the void are defined as the contact points of the straight portion and the radius.
Moreover, it is preferable that the radius of the radius of the corner part 14 is 15 mm or more. This is because the effect of reducing the tensile stress applied around the corner is large. Preferably it is 16 mm-26 mm. At this time, chamfering of the corner corresponding to the corner is chamfered not less than the radius of curvature of the corner.
In the structure in which the void portion was not formed, the maximum tensile stress generated at the corner exceeded 1500 MPa, whereas in the shape having the void portion, it was 1500 MPa or less. Moreover, the maximum tensile stress showed 1100 MPa or less by making the radius of a corner 15 mm or more.
From this result, it can be seen that the stress applied to the mold piece largely differs depending on the presence or absence of the void portion formed by the chamfered portion. In addition, it is also understood that the stress can be significantly reduced at a radius of 15 mm or more for the radius formed at the corner. Thereby, it is understood that the formation of the void portion can more reliably prevent the occurrence of the crack of the hot forging die.
As an example of such a combination, it is also possible to make the entire surface of the working surface (mold engraving surface) a Ni-based super heat-resistant alloy, or a place to which a larger stress is applied at the time of hot forging It is also possible to use Ni-based super heat-resistant alloy mold pieces in places exposed to high temperatures sometimes, and at least one of the other mold pieces to be steel for hot molds. According to the former structure (the entire surface of the work surface is made of a Ni-based super heat resistant alloy), there is an advantage that the entire surface of the work surface can be strengthened. Moreover, it is economical compared to the case of manufacturing a one-piece hot forging die made of a Ni-based super heat-resistant alloy. In the latter case, if a mold piece having a Ni-based super heat-resistant alloy is disposed at a place where the wear resistance and heat resistance of the hot forging die at the time of hot forging are particularly required, It is economical and particularly preferable because it improves the life and uses less expensive hot mold steel.
Further, in the present invention, since the mold pieces are prepared individually, it is possible to reduce the mold manufacturing cost particularly when hot forging a large product. For example, the application to the hot forging of a large-sized turbine blade material is effective.
The Ni-based super heat resistant alloy referred to in the present invention is, for example, an alloy corresponding to UDIMET 520 (UDIMET is a registered trademark of Special Metals), an alloy corresponding to Udimet 720, an alloy equivalent to Waspaloy, an alloy corresponding to Alloy 718, etc., Al, Ti, Nb, etc. An alloy mainly composed of Ni capable of precipitation strengthening of intermetallic compounds.
The use of hot forging die of the present invention described above, it becomes possible to high mold manufacturing yield, obtained hot forged material having a desired surface form can also be stabilized quality. Also, if a mold piece of high strength material is provided and placed in a place including the stress concentration portion of the forging pressure, it is possible to prevent problems such as cracking of the mold during hot forging.
Further, when the Ni-based super heat-resistant alloy layer is formed on the working surface side of the mold piece to be used, the life of the mold can be further improved. In addition, since it is possible to form a Ni-based super heat resistant alloy layer for each mold piece, there is no need to particularly increase the size of a build-up welder that forms a Ni-based super heat resistant alloy layer. is there.
Hot forging die of the present invention, even when manufacturing a forged material for large turbine blades, it is possible to more reliably prevent the cracking of the hot forging die used therefor.
- A hot forging die for a turbine blade, wherein an assembly of a plurality of die pieces joined together to form an integral body is mounted as a core in a base die,
The hot forging die comprises a die-cut surface in the form of the turbine blade,
The engraving surface is composed of the plurality of mold pieces,
Wherein when viewed engraved surface of the turbine blade shape from above, in so that such a diagonal to the longitudinal direction of the dividing line of the plurality of mold pieces in engraved surface of the turbine blade shape, the plurality A mold for hot forging characterized in that the mold pieces of (1) are joined.
- The mold for hot forging according to claim 1, wherein at least one of the mold piece and the base metal mold is coated with a Ni-based super heat-resistant alloy layer on the working surface side.
Priority Applications (1)
|Application Number||Priority Date||Filing Date||Title|
|JP2015096235A JP6521369B2 (en)||2015-05-11||2015-05-11||Hot forging die|
Applications Claiming Priority (1)
|Application Number||Priority Date||Filing Date||Title|
|JP2015096235A JP6521369B2 (en)||2015-05-11||2015-05-11||Hot forging die|
|Publication Number||Publication Date|
|JP2016209908A JP2016209908A (en)||2016-12-15|
|JP6521369B2 true JP6521369B2 (en)||2019-05-29|
Family Applications (1)
|Application Number||Title||Priority Date||Filing Date|
|JP2015096235A Active JP6521369B2 (en)||2015-05-11||2015-05-11||Hot forging die|
Country Status (1)
|JP (1)||JP6521369B2 (en)|
Family Cites Families (11)
|Publication number||Priority date||Publication date||Assignee||Title|
|JPS586744A (en) *||1981-07-01||1983-01-14||Toyota Motor Corp||Die with elliptic internal die hole|
|JPH0133263B2 (en) *||1983-05-23||1989-07-12||Mitsutoyo Kiko Kk|
|JPS623845A (en) *||1985-06-28||1987-01-09||Masahiro Yokoi||Cold pressing tool|
|DE69422424T2 (en) *||1993-12-17||2000-08-03||Wyman Gordon Co||Tiered, segmented forge with closed die|
|JP3857897B2 (en) *||2001-09-21||2006-12-13||新キャタピラー三菱株式会社||Mold reassignment device and mold reassignment method|
|RU2220020C1 (en) *||2002-04-04||2003-12-27||Открытое акционерное общество "Чепецкий механический завод"||Method of manufacture of forgings, predominantly out of metals and alloys of titanium subgroup and forging complex for performing the same|
|DE102007032804B3 (en) *||2007-07-10||2008-09-04||V&M Deutschland Gmbh||Forging mandrel for hot-forging of tubular work-pieces made of metal has a mandrel body made from heat-resistant material and a mandrel rod|
|GB0915949D0 (en) *||2009-09-11||2009-10-28||Rolls Royce Plc||A die former|
|KR20110038774A (en) *||2009-10-09||2011-04-15||정연수||Split die for forming bolt head or nut|
|JP6311969B2 (en) *||2013-03-28||2018-04-18||日立金属株式会社||Die for hot forging and hot forging method|
|JP6028678B2 (en) *||2013-05-29||2016-11-16||トヨタ紡織株式会社||Molding equipment|
- 2015-05-11 JP JP2015096235A patent/JP6521369B2/en active Active
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