CN112642987A - GH4169 alloy bolt forming method and alloy bolt - Google Patents
GH4169 alloy bolt forming method and alloy bolt Download PDFInfo
- Publication number
- CN112642987A CN112642987A CN202011518960.9A CN202011518960A CN112642987A CN 112642987 A CN112642987 A CN 112642987A CN 202011518960 A CN202011518960 A CN 202011518960A CN 112642987 A CN112642987 A CN 112642987A
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- China
- Prior art keywords
- bolt
- hot heading
- forming
- blank
- forming die
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- 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.)
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 21
- 239000000956 alloy Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 6
- 230000006698 induction Effects 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229910000601 superalloy Inorganic materials 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/44—Making machine elements bolts, studs, or the like
- B21K1/46—Making machine elements bolts, studs, or the like with heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/44—Making machine elements bolts, studs, or the like
- B21K1/46—Making machine elements bolts, studs, or the like with heads
- B21K1/50—Trimming or shearing formed heads, e.g. working with dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/06—Specially-shaped heads
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Forging (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a GH4169 alloy bolt forming method and an alloy bolt, and the method comprises the following steps: selecting materials: placing a blank into a hot heading forming die, wrapping a bolt rod part by the lower section of the hot heading forming die, penetrating the bolt rod part into a middle section through hole of the hot heading forming die, and positioning the head part of the blank to be formed in an upper section forming hole of the hot heading forming die; heating: the heating power is 500-800W, the constant heating time is 5-8 seconds, and the heating length from the top to the bottom is 20 mm. Hot heading forming: and (5) using a hot heading machine to perform hot heading forming on the blank in the hot heading forming die. After the bolt head is subjected to thermal deformation forming, the hardness of the radius of 1/2 of the diameter phi of an inscribed circle on the top end face of the bolt head is 42HRC, the grain flow line of the bolt head is complete, the grain size is 8 grade, the difference between the hardness index and the hardness index of a raw material for manufacturing the bolt is not lower than 4HRC, the tensile index at room temperature is 1687MPa, the fracture form is that the thread ending part of the bolt rod part fractures, and the bolt head is ensured not to fracture under the tensile stress of 1515 MPa-1725 MPa.
Description
Technical Field
The invention relates to a GH4169 alloy bolt forming method and an alloy bolt, and belongs to the technical field of bolt processing.
Background
The bolt made of GH4169 precipitation-strengthened nickel-based superalloy for aviation is generally a stress type bolt with the strength of 1275MPa and a fatigue type bolt, and with the continuous upgrading and updating of the performance of aerospace flight equipment, based on a weight reduction design, a thin-head nickel-based superalloy bolt with high fatigue resistance, high bearing capacity and high corrosion resistance needs to be met, and the strength needs to reach 1515 MPa-1725 MPa; however, the existing thin-head type nickel-based superalloy bolts do not reach the strength of 1515MPa to 1725MPa, and the bolts with the strength of 1275MPa in the thin-head type nickel-based superalloy grade have the problem of head fracture under the tensile stress of 1515MPa to 1725 MPa.
Disclosure of Invention
In order to solve the technical problems, the invention provides a GH4169 alloy bolt forming method.
The invention provides a GH4169 alloy bolt.
The invention is realized by the following technical scheme.
The invention provides a GH4169 alloy bolt forming method, which comprises the following steps:
selecting materials: placing a blank into a hot heading forming die, wrapping a bolt rod part by the lower section of the hot heading forming die, penetrating the bolt rod part into a middle section through hole of the hot heading forming die, and positioning the head part of the blank to be formed in an upper section forming hole of the hot heading forming die;
heating: the heating power is 500-800W, and the heating is constant for 5-8 seconds.
Hot heading forming: and (5) using a hot heading machine to perform hot heading forming on the blank in the hot heading forming die.
In the heating step, the length of heating was 20mm from the top downward.
In the material selecting step, the diameter phi of the blank is 12.2mm, and the length L of the blank is 60 mm.
In the heating step, the heater is a VH-VIII-50 type high-frequency induction heater, an induction coil is wound by a copper pipe with the diameter phi of 6mm, the effective number of winding turns is 8, and the inner diameter phi of the coil is 20mm, so that the blank is heated.
The invention has the beneficial effects that: after the bolt head is subjected to thermal deformation forming, the hardness of the radius of 1/2 of the diameter phi of an inscribed circle on the top end face of the bolt head is 42HRC, the grain flow line of the bolt head is complete, the grain size is 8 grade, the difference between the hardness index and the hardness index of a raw material for manufacturing the bolt is not lower than 4HRC, the tensile index at room temperature is 1687MPa, the fracture form is that the thread ending part of the bolt rod part fractures, and the bolt head is ensured not to fracture under the tensile stress of 1515 MPa-1725 MPa.
Drawings
FIG. 1 is a schematic sectional front view of a hot heading forming die according to the present invention;
FIG. 2 is a schematic sectional view of the upper section of the hot heading forming die of the present invention;
FIG. 3 is a schematic top view of an upper section of the hot heading forming die of the present invention;
FIG. 4 is a schematic cross-sectional front view of a middle section of the hot heading forming die of the invention;
FIG. 5 is a schematic cross-sectional view of a lower section of the hot heading forming die of the present invention;
fig. 6 is a schematic view of a bolt structure.
Fig. 7 is a schematic view of a bolt head.
In the figure: 51-lower section; 52-middle section; 53-upper section; 61-bolt head; 62-bolt shank.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
See fig. 1-6.
The GH4169 alloy bolt forming method comprises the following steps of forming a thin hexagonal head GH4169 alloy bolt with the specification of 12 x 40 (a thread MJ12 x 1.25) and the thickness of 5mm and the strength grade of 1515 MPa-1725 MPa:
selecting materials: the diameter phi of the blank is 12.2mm, the length L of the blank is 60mm, the blank is placed into a hot heading forming die, the lower section 51 of the hot heading forming die wraps the bolt rod part 62, the bolt rod part penetrates into a through hole of the middle section 52 of the hot heading forming die, and the part of the bolt head part 61 to be formed of the blank is positioned in a forming hole of the upper section 53 of the hot heading forming die;
heating: the VH-VIII-50 type high-frequency induction heater is adopted, an induction coil is wound by a copper pipe with the diameter phi of 6mm, the effective winding number is 8, the inner diameter phi of the coil is 20mm, the heating power is 500-800W, constant heating is carried out for 5-8 seconds, and the heating length from the top to the bottom is 20 mm.
Hot heading forming: and (5) using a hot heading machine to perform hot heading forming on the blank in the hot heading forming die.
After the bolt head 61 is subjected to thermal deformation forming, the hardness of the radius of 1/2 of the diameter phi of an inscribed circle on the top end face of the bolt head is 42HRC, the grain flow line of the bolt head is complete, the grain size is 8 grade, the difference between the hardness index and the hardness index of a raw material for manufacturing the bolt is not lower than 4HRC, the tensile index at room temperature is 1687MPa, the fracture form is that the thread ending part of the bolt rod part 62 is fractured, and the bolt head is ensured not to fracture under the tensile stress of 1515 MPa-1725 MPa.
A GH4169 alloy bolt comprising: the bolt comprises a bolt head 61 and a bolt rod part 62 integrally connected with the bolt head 61, wherein the top end face of the bolt head 61 is inscribed with a radius 1/2 of a circle diameter phi and is subjected to thermal deformation forming by the GH4169 alloy bolt forming method, the hardness is 42HRC, the streamline of a bolt head crystal grain is complete, the grain size is 8 grade, and the difference between the hardness 42HRC and the hardness 38HRC of a raw material for manufacturing the bolt is not lower than 4 HRC.
Claims (5)
1. A forming method of a GH4169 alloy bolt is characterized by comprising the following steps:
selecting materials: the method comprises the following steps that a blank is placed into a hot heading forming die, a bolt rod part (62) is wrapped by the lower section (51) of the hot heading forming die, the bolt rod part penetrates into a through hole of the middle section (52) of the hot heading forming die, and the part, to be formed, of the bolt head (61) of the blank is located in a forming hole of the upper section (53) of the hot heading forming die;
heating: the method comprises the steps of heating for 5-8 seconds at a constant heating power of 500-800W;
hot heading forming: and (5) using a hot heading machine to perform hot heading forming on the blank in the hot heading forming die.
2. The method for forming GH4169 alloy bolt as claimed in claim 1, wherein: in the heating step, the length of heating was 20mm from the top downward.
3. The method for forming GH4169 alloy bolt as claimed in claim 1, wherein: in the material selecting step, the diameter phi of the blank is 12.2mm, and the length L of the blank is 60 mm.
4. The method for forming GH4169 alloy bolt as claimed in claim 1, wherein: in the heating step, the heater is a VH-VIII-50 type high-frequency induction heater, an induction coil is wound by a copper pipe with the diameter phi of 6mm, the effective number of winding turns is 8, and the inner diameter phi of the coil is 20mm, so that the blank is heated.
5. A GH4169 alloy bolt comprising: the bolt head part (61) and the bolt rod part (61) connected with the bolt head part (61) in an integral mode, wherein the top end face of the bolt head part (61) is inscribed at the radius of 1/2 with the diameter phi, and the hardness of the bolt is 42HRC after the GH4169 alloy bolt forming method according to any one of claims 1 to 4 is subjected to hot deformation forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011518960.9A CN112642987A (en) | 2020-12-21 | 2020-12-21 | GH4169 alloy bolt forming method and alloy bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011518960.9A CN112642987A (en) | 2020-12-21 | 2020-12-21 | GH4169 alloy bolt forming method and alloy bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112642987A true CN112642987A (en) | 2021-04-13 |
Family
ID=75358552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011518960.9A Pending CN112642987A (en) | 2020-12-21 | 2020-12-21 | GH4169 alloy bolt forming method and alloy bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112642987A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU5467498A (en) * | 1996-01-11 | 1998-04-23 | Fci Holdings Delaware, Inc. | Cable bolt head |
| CN102764843A (en) * | 2012-08-15 | 2012-11-07 | 浙江中航来宝精工科技有限公司 | Method and die for processing bolt |
| CN103111808A (en) * | 2013-02-01 | 2013-05-22 | 贵州精立航太科技有限公司 | Nickel-based superalloy GH4169 hexagon socket bolt machining technology |
| CN104475635A (en) * | 2014-11-18 | 2015-04-01 | 河南航天精工制造有限公司 | Super-long rod bolt head hot-forging molding device and molding method |
| CN106956110A (en) * | 2017-04-21 | 2017-07-18 | 绵竹市凯瑞机械加工有限公司 | A kind of processing method of hexagon socket head cap screw |
| CN107287404A (en) * | 2017-07-01 | 2017-10-24 | 贵州航天精工制造有限公司 | A kind of GH159 bolt heads processing method |
| CN108504833A (en) * | 2018-03-28 | 2018-09-07 | 贵州航天精工制造有限公司 | A kind of GH4169 superhigh intensitys antifatigue bolt processing method |
| CN109622868A (en) * | 2018-12-11 | 2019-04-16 | 陕西宏远航空锻造有限责任公司 | A kind of forging method of T-type high-temperature alloy bolt forging |
-
2020
- 2020-12-21 CN CN202011518960.9A patent/CN112642987A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU5467498A (en) * | 1996-01-11 | 1998-04-23 | Fci Holdings Delaware, Inc. | Cable bolt head |
| CN102764843A (en) * | 2012-08-15 | 2012-11-07 | 浙江中航来宝精工科技有限公司 | Method and die for processing bolt |
| CN103111808A (en) * | 2013-02-01 | 2013-05-22 | 贵州精立航太科技有限公司 | Nickel-based superalloy GH4169 hexagon socket bolt machining technology |
| CN104475635A (en) * | 2014-11-18 | 2015-04-01 | 河南航天精工制造有限公司 | Super-long rod bolt head hot-forging molding device and molding method |
| CN106956110A (en) * | 2017-04-21 | 2017-07-18 | 绵竹市凯瑞机械加工有限公司 | A kind of processing method of hexagon socket head cap screw |
| CN107287404A (en) * | 2017-07-01 | 2017-10-24 | 贵州航天精工制造有限公司 | A kind of GH159 bolt heads processing method |
| CN108504833A (en) * | 2018-03-28 | 2018-09-07 | 贵州航天精工制造有限公司 | A kind of GH4169 superhigh intensitys antifatigue bolt processing method |
| CN109622868A (en) * | 2018-12-11 | 2019-04-16 | 陕西宏远航空锻造有限责任公司 | A kind of forging method of T-type high-temperature alloy bolt forging |
Non-Patent Citations (5)
| Title |
|---|
| 李钊等: "镦制温度对GH4169合金紧固件组织的影响", 《材料热处理学报》 * |
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| 郭晓凡等: "熔体过热处理工艺对GH4169合金组织和力学性能的影响", 《金属功能材料》 * |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210413 |
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