CN110757095A - Method for forming double-lug supporting plate screw supporting plate - Google Patents
Method for forming double-lug supporting plate screw supporting plate Download PDFInfo
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- CN110757095A CN110757095A CN201810839529.0A CN201810839529A CN110757095A CN 110757095 A CN110757095 A CN 110757095A CN 201810839529 A CN201810839529 A CN 201810839529A CN 110757095 A CN110757095 A CN 110757095A
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- supporting plate
- annealing
- upsetting
- forming
- box
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention discloses a method for molding a double-lug supporting plate screw supporting plate, which comprises the following steps: upsetting a T-shaped blank by a multi-station cold header, softening, annealing and pretreating: blowing sand, phosphorizing and saponifying, upsetting and molding a 1.5mm thick supporting plate by a press, punching the appearance of the supporting plate, and performing heat treatment to the temperature of sigma b = 590-charge 735 MPa.
Description
Technical Field
The invention belongs to the technical field of aviation manufacturing, and particularly relates to a method for molding a double-lug supporting plate screw supporting plate.
Background
In aircraft assembly, a large number of double-lug supporting plate screws are used for connection. The shape of the part is shown in fig. 1 and fig. 2, and the structure of the part comprises a threaded rod 1 and a double-lug supporting plate 2. The part material is ML25 (material strength sigma b =590-735 MPa), the part strength sigma b =590-735MPa, the thread diameter is M3-M6, the rod part length is 10-40 mm, the thickness of the support plate is 1.5mm, the aspect ratio of the support plate is 2:1, and the length of the support plate is 18-26 mm. The molding of the double-lug supporting plate is a processing difficulty of the part.
The current method for forming the double-lug supporting plate screw supporting plate in the aerospace industry comprises the following steps: upsetting a 2.0mm thick supporting plate by a multi-station cold header, annealing and destressing, turning the thickness of the supporting plate to be 1.5mm, punching the appearance of the supporting plate, and annealing and destressing.
The prior art proposal has large deformation force and short service life of the die when the supporting plate is upset on a cold header; in the process of turning the thickness of the supporting plate, because the appearance of the supporting plate is not circular, most of chip breaking and cutting processes are carried out in turning, the turning efficiency is low, the surface roughness of the supporting plate is poor, and the production cost is high.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for molding a double-lug supporting plate screw supporting plate, which realizes the direct upsetting molding of the double-lug supporting plate, solves the problems of short service life of an upsetting mold, low thickness processing efficiency of a turning supporting plate and poor surface roughness and reduces the production cost.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for forming a double-lug supporting plate screw supporting plate is characterized in that: the method comprises the following process steps:
(1) upsetting a T-shaped blank: cutting the wire material into a T-shaped blank on a multi-station cold header;
(2) softening and annealing: putting the T-shaped blank into a leather case, burying parts with cast iron sand, sealing the leather case, sealing the case cover with quartz sand, and annealing at the following temperature: keeping the temperature at 680 +/-10 ℃ for 7 hours; then the sheet iron box is taken out of the furnace and naturally cooled;
(3) pretreatment before molding: removing annealing oxide skin by adopting a sand blowing process, and carrying out phosphating and saponification process treatment on the blank;
(4) upsetting a forming supporting plate by a press: forming a supporting plate on the pretreated T-shaped blank on a crank press; the pallet profile is then die cut.
And (3) the annealing equipment for softening and annealing in the step (2) is a box-type electric furnace.
And (2) in the step (2), the iron sheet box is not opened when the iron sheet box is discharged from the furnace and naturally cooled.
The invention has the following advantages:
compared with the prior art, the invention has the following positive effects and is applied to actual production:
1. the deformation degree of the multi-station cold header is reduced, the forming force acting on the cold header is reduced, and the service life of the cold header is prolonged by more than 150%;
the 2.1.5 mm thick supporting plate is directly formed by upsetting through a press, the forming time is 5 seconds per piece, and the efficiency is improved by 60 times compared with the efficiency of turning the supporting plate by a lathe for 5 minutes per piece;
3. the surface roughness of the upsetting-made supporting plate is Ra1.6, which is improved by two grades compared with the cutting roughness Ra6.3.
Drawings
FIG. 1 is a schematic structural view of a binaural supporting plate screw;
FIG. 2 is a schematic diagram of a bracket structure of a binaural bracket screw;
the labels in the figure are: 1. threaded rod, 2, ears layer board.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following examples, which are conventional unless otherwise specified, and the materials are commercially available from the public unless otherwise specified.
The invention provides a method for molding a double-lug supporting plate screw supporting plate, which comprises the following steps: upsetting a T-shaped blank by a multi-station cold header, softening and annealing, and pretreating: blowing sand, phosphorizing, saponifying, upsetting and molding a supporting plate with the thickness of 1.5mm by a press, punching the appearance of the supporting plate, and carrying out heat treatment to sigma b = 590-charge 735 MPa.
The specific implementation steps are as follows:
1. upsetting T-shaped blank
The requirement of final upsetting forming of the rod part and the supporting plate of the double-lug supporting plate screw is met by cutting wires, performing primary upsetting forming and performing final upsetting forming on a multi-station cold header
2. Softening and annealing
And a softening annealing process is adopted to replace a destressing annealing process, so that the work hardening caused by upsetting deformation is eliminated, and the plastic deformation capacity of the subsequent upsetting forming supporting plate is improved.
Annealing equipment: a box-type electric furnace; annealing temperature: 680 +/-10 ℃; the annealing method comprises the following steps: the parts are placed in a metal box, the parts are buried by cast iron sand (new and old halves), the metal box is closed, and the box cover is sealed by quartz sand, so that air is prevented from continuously entering, and the parts are prevented from being decarburized in annealing. And (3) heat preservation time: 7 hours; a cooling mode: the iron sheet box is taken out of the furnace for air cooling, but the iron sheet box is not opened.
3. Pretreatment before forming
The method has the advantages that the annealing oxide skin is removed by adopting a sand blowing process, the lubrication before upsetting and forming is realized by adopting a phosphorization and saponification process on the blank, the forming force is reduced, the service life of a die is prolonged, and the surface roughness of a formed part is improved.
4. Press upset flat forming 1.5mm supporting plate
A1.5 mm thick pallet is formed on a 160 ton crank press, and in order to ensure the enough size in the length direction, a strip-shaped groove with the depth of 0.5mm is formed on a die, and finally a 1.5mm thick pallet blank with steps meeting the appearance of a punched pallet is formed.
Claims (3)
1. A method for forming a double-lug supporting plate screw supporting plate is characterized in that: the method comprises the following process steps:
(1) upsetting a T-shaped blank: cutting the wire material into a T-shaped blank on a multi-station cold header;
(2) softening and annealing: putting the T-shaped blank into a leather case, burying parts with cast iron sand, sealing the leather case, sealing the case cover with quartz sand, and annealing at the following temperature: keeping the temperature at 680 +/-10 ℃ for 7 hours; then the sheet iron box is taken out of the furnace and naturally cooled;
(3) pretreatment before molding: removing annealing oxide skin by adopting a sand blowing process, and carrying out phosphating and saponification process treatment on the blank;
(4) upsetting a forming supporting plate by a press: forming a supporting plate on the pretreated T-shaped blank on a crank press; the pallet profile is then die cut.
2. The method of claim 1 wherein the method further comprises: and (3) the annealing equipment for softening and annealing in the step (2) is a box-type electric furnace.
3. The method of claim 1 wherein the method further comprises: and (2) in the step (2), the iron sheet box is not opened when the iron sheet box is discharged from the furnace and naturally cooled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810839529.0A CN110757095A (en) | 2018-07-27 | 2018-07-27 | Method for forming double-lug supporting plate screw supporting plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810839529.0A CN110757095A (en) | 2018-07-27 | 2018-07-27 | Method for forming double-lug supporting plate screw supporting plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110757095A true CN110757095A (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810839529.0A Pending CN110757095A (en) | 2018-07-27 | 2018-07-27 | Method for forming double-lug supporting plate screw supporting plate |
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| Country | Link |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06226788A (en) * | 1992-12-25 | 1994-08-16 | Fukuko Cho | Molding method for longitudinally long seamless stell mold tool |
| CN101429630A (en) * | 2007-06-12 | 2009-05-13 | 江阴康瑞不锈钢制品有限公司 | Novel austenite cold-heading stainless steel and its steel wire production method |
| CN102876872A (en) * | 2012-09-04 | 2013-01-16 | 河南航天精工制造有限公司 | Softening method for spherical tissue of 0Cr17Ni4Cu4Nb supporting plate self-locking nut |
| CN103586633A (en) * | 2013-10-31 | 2014-02-19 | 江西洪都航空工业集团有限责任公司 | Method for machining stainless steel singe dual-lug support plate nut |
| CN107030452A (en) * | 2017-05-09 | 2017-08-11 | 江苏创精锻有限公司 | A kind of automobile long handle sliding sleeve moulding process |
| CN107099644A (en) * | 2017-03-11 | 2017-08-29 | 江苏莲源机械制造有限公司 | Forge annelaing pot |
-
2018
- 2018-07-27 CN CN201810839529.0A patent/CN110757095A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06226788A (en) * | 1992-12-25 | 1994-08-16 | Fukuko Cho | Molding method for longitudinally long seamless stell mold tool |
| CN101429630A (en) * | 2007-06-12 | 2009-05-13 | 江阴康瑞不锈钢制品有限公司 | Novel austenite cold-heading stainless steel and its steel wire production method |
| CN102876872A (en) * | 2012-09-04 | 2013-01-16 | 河南航天精工制造有限公司 | Softening method for spherical tissue of 0Cr17Ni4Cu4Nb supporting plate self-locking nut |
| CN103586633A (en) * | 2013-10-31 | 2014-02-19 | 江西洪都航空工业集团有限责任公司 | Method for machining stainless steel singe dual-lug support plate nut |
| CN107099644A (en) * | 2017-03-11 | 2017-08-29 | 江苏莲源机械制造有限公司 | Forge annelaing pot |
| CN107030452A (en) * | 2017-05-09 | 2017-08-11 | 江苏创精锻有限公司 | A kind of automobile long handle sliding sleeve moulding process |
Non-Patent Citations (2)
| Title |
|---|
| 柏立庆，殷秀银: "14Cr17Ni2托板自锁螺母热处理工艺", 《金属加工（热处理）》 * |
| 王修保: "双耳托板自锁螺母冷镦工艺及模具设计", 《模具制造》 * |
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Application publication date: 20200207 |