CN115213640A - Processing method of single-side extrusion reinforced slotted core rod - Google Patents
Processing method of single-side extrusion reinforced slotted core rod Download PDFInfo
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- 238000001125 extrusion Methods 0.000 title claims abstract description 183
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- 238000003754 machining Methods 0.000 claims description 10
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- 238000005242 forging Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
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Abstract
The invention provides a method for processing a single-side extrusion reinforced slotted core rod, which comprises the following steps: (1) Selecting a slotted extrusion core rod material as W6Mo5Cr4V2 high-speed steel; (2) Blanking a W6Mo5Cr4V2 high-speed steel bar material based on the primary hole diameter of the extruded hole structural member; (3) Roughly processing the W6Mo5Cr4V2 high-speed steel bar stock after blanking by using a slotted extrusion core rod design drawing to form a solid extrusion core rod; (4) integrally quenching the solid extrusion core rod; (5) local annealing of the extrusion strengthening part of the solid core rod; (6) forming a central hole on the solid extrusion core rod; (7) The extrusion strengthening part of the solid core rod is provided with a slot so as to form a slotted extrusion core rod; (8) Finely processing the slotted extrusion core rod to meet the requirements of design size and roughness; (9) And polishing the extrusion strengthening part of the slotted core rod to enable the part to meet the design requirement. The single-side extrusion strengthening device is simple in structure and convenient to operate, single-side extrusion strengthening of the hole structural member can be realized, and the fatigue performance of the hole structural member is improved.
Description
The application aims at the patent number ZL202011447830 and provides a process for strengthening an assembly hole by cold extrusion through a slotted core rod.
Technical Field
The invention discloses a method for processing a single-side extrusion reinforced slotted core rod, belongs to the technical field of hole extrusion reinforced precision machining, and particularly relates to a method for processing a slotted core rod hole extrusion reinforcing tool capable of realizing single-side extrusion reinforcement.
Background
Most structural members on the airplane are connected by installing fasteners in the assembly holes, and due to the existence of the assembly holes, the structural members are discontinuous in material, stress concentration is generated, fatigue cracks are easy to generate, and the fatigue crack propagation rate is increased. The hole extrusion strengthening is a simple and efficient hole structural member extrusion strengthening technology, and can enable the hole wall to form a beneficial residual compressive stress field to offset tensile stress generated by an external alternating load, so that the fatigue performance of the hole structural member is improved.
The core rod hole extrusion belongs to direct extrusion strengthening, the extrusion core rod is in direct contact with the hole wall of a structural member in the hole extrusion strengthening process, the extrusion amount is totally acted on the hole wall, and the structure is simple and convenient to operate. The extrusion core rod used in the core rod extrusion strengthening is divided into a solid core rod and a slotted core rod. Among them, the solid core rod cannot be subjected to single-side extrusion reinforcement, extrusion reinforcement with a large extrusion amount, and the like, and extrusion reinforcement conditions are limited.
Chinese patent document No. CN112680677A proposes a process for reinforcing an assembly hole by using slotted core rod cold extrusion, which comprises the following steps: before cold extrusion strengthening of the extruded workpiece assembly hole, the front surface of the slotting core rod sequentially penetrates through the auxiliary plate and the extruded workpiece assembly hole; the slit core rod is symmetrically provided with a plurality of slits, so that the slit core rod working ring can be contracted, and the extrusion strengthening of the assembly hole of the extruded workpiece is not carried out. Inserting a support rod into the slotted core rod, so that the position of the working ring of the slotted core rod cannot be contracted, the diameter of the working ring of the slotted core rod is larger than the diameter of the assembling hole of the extruded workpiece, and in the process of pulling out the slotted core rod at a constant speed, the working ring of the slotted core rod extrudes the wall of the assembling hole to enable the assembling hole to generate plastic deformation, thereby realizing the strengthening effect. The invention does not need to use a lining in the hole extrusion strengthening process, eliminates the consumption of the lining in the extrusion process, and improves the extrusion strengthening effect.
The application situations and the research situations of domestic and foreign slotted bushes are reviewed in weapon material science and engineering, 2013, and 36 (6) 'slotted bush preparation technology review' which introduces the main characteristics and the preparation principle of the slotted bushes, analyzes the existing problems of the slotted bush preparation technology by comparing the advantages and the disadvantages of the domestic and foreign slotted bushes, and has important guiding significance for improving the slotted bush preparation technology. This article mainly reviews the split bushing preparation technique, the differences between split bushing and split mandrel: (1) different preparation processes. In summary, roll bending is used for the slotted bushing, and the slotted core rod is mainly processed by the procedures of material selection, blanking, rough machining, integral quenching, local annealing, slotting, fine machining and the like to form the slotted core rod. And (2) different hole extrusion strengthening principles. In the process of extruding and strengthening the slotted bushing hole, the extrusion core rod is in indirect contact with the hole wall of the structural member, the extrusion amount part acts on the hole wall, the extrusion core rod extrudes the slotted bushing, the slotted bushing generates elastic deformation to extrude and strengthen the hole wall of the structural member, and the hole wall of the structural member generates elastic-plastic deformation to realize the extrusion strengthening of the hole structural member; in the process of extruding and strengthening the slotted core rod hole, the slotted core rod is directly contacted with the hole wall of the structural member, all extrusion amount acts on the hole wall, the slotted core rod extrudes and strengthens the hole wall of the structural member, and the hole wall material is subjected to extrusion force to generate elastic-plastic deformation, so that the extrusion strengthening of the hole structural member is realized. Therefore, the patent document of the application shows that there is a significant difference between the single-side extrusion reinforced slotted core rod processing method and the slotted liner preparation technology.
The authorization notice number is: CN108103288B, which is a patent document, proposes a method for preparing a mandrel bar for a seamless steel tube and a mandrel bar for a seamless steel tube. The preparation methodThe method mainly comprises the steps of steel ingot casting, primary homogenization treatment, radial forging blank manufacturing, secondary homogenization treatment, core rod blank preparation, grain refinement treatment and the like. By adopting the preparation method of the mandrel for the seamless steel pipe, the homogenization by high-temperature diffusion twice, the manufacture of the radial forging blank and the forging of the mandrel blank are organically combined, the dynamic condition which is favorable for the diffusion of carbon and alloy elements is created, and the matrix structure of the mandrel material with the carbon and the alloy elements distributed in the steel matrix which are very homogenized is obtained in the same or shorter homogenization time, so that the prepared mandrel has the characteristics of high toughness, high red hardness, long service life and better performance. The main differences between this patent document and the patent document of this application are: and (1) different processing technologies. The preparation process of the mandrel for the seamless steel tube mainly comprises the steps of steel ingot casting, primary homogenization treatment, radial forging blank manufacturing, secondary homogenization treatment, mandrel blank preparation, grain refinement treatment and the like, the processing process of the slotted mandrel mainly comprises the working procedures of material selection, blanking, rough machining, integral quenching, local annealing, slotting, fine machining and the like, and the processing technologies of the two mandrels are obviously different. (2) the raw materials constituting the core rod are different. The mandrel for the seamless steel pipe is cast from a steel ingot, raw material components forming the mandrel are cast to form the steel ingot, and the raw material components forming the mandrel comprise the following components in percentage by weight: 0.33 to 0.39 percent of C, 4.7 to 5.20 percent of Cr, 0.15 to 0.35 percent of Si, 1.70 to 2.50 percent of Mo, 0.40 to 0.70 percent of V, less than or equal to 0.02 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.20 percent of Cu and 0 tot Less than or equal to 0.0015, and the balance of Fe and impurities. The material of the slotted core rod is W6Mo5Cr4V2 high-speed steel, and the slotted core rod comprises the following raw material components in percentage by weight: 0.15 to 0.40 percent of Mn, less than or equal to 0.030 percent of S, less than or equal to 0.030 percent of P, 3.80 to 4.40 percent of Cr, less than or equal to 0.30 percent of Ni, 1.75 to 2.20 percent of V, 4.50 to 5.50 percent of Mo, and 5.50 to 6.75 percent of W. The materials and raw material components of the mandrel for the seamless steel pipe and the slotted mandrel are obviously different. (3) a heat treatment form. The seamless steel tube is subjected to four times of heat treatment in the core rod processing process, while the slotted core rod is subjected to two times of heat treatment in the processing process, wherein the positions of the two times of heat treatment are different, the blanked bar is processed into a solid core rod, the solid extrusion core rod is integrally quenched at the quenching temperature of 1100 ℃, and the HRC of the extrusion core rod is 35-45; then local annealing is carried out on the extrusion strengthening part of the extrusion core rodThe microhardness HRC of the extrusion strengthening part is 62-66, local annealing is carried out by using a high-frequency machine, and the annealing temperature is 800 ℃. There are significant differences in the heat treatment patterns. And (4) different technical fields. The technical field of hot-work grinding tool steel manufacturing, and the technical field of a single-side extrusion reinforced slotted core rod processing method belongs to the technical field of hole extrusion reinforced precision processing. And (5) different processing precision. The surface roughness of the core rod is not limited in the preparation process of the core rod for the seamless steel tube, and in the preparation process of the slotted core rod, the front conical section, the working ring and the rear conical section of the slotted core rod are polished by using a metal brightener to ensure that the surface roughness is 0.1 mu m. It is understood from the above that the method for producing a mandrel bar for a seamless steel pipe and the patent document for a mandrel bar for a seamless steel pipe are significantly different from the patent document for a method for processing a slotted mandrel bar by reinforcing with single-sided extrusion.
In summary, the existing extrusion strengthening process for slotted core rod holes does not describe the processing method of the slotted core rod, so that the extrusion strengthening process for slotted core rod holes is not popularized yet. Therefore, the invention provides a method for processing the slotted core rod by single-side extrusion strengthening, which realizes the single-side extrusion strengthening of the hole structural member, the repeated use of the hole extrusion strengthening tool and the improvement of the fatigue life of the hole structural member and aims to popularize and apply the slotted core rod hole extrusion strengthening process.
Disclosure of Invention
In the process of extruding and strengthening the slotted liner hole, the wall of the liner is thin, so that severe plastic deformation is easy to occur, the liner cannot be reused, and the cost of the hole extrusion strengthening process is seriously influenced; in the extrusion strengthening process of the solid core rod hole, unilateral operation and large extrusion amount extrusion strengthening cannot be carried out, the extrusion environment is limited, and the extrusion strengthening efficiency of the hole structural part is influenced. Therefore, the invention provides a processing method of the single-side extrusion reinforced slotted core rod by combining the slotted bushing and the solid extrusion core rod. The invention can realize single-side extrusion strengthening of the slotted core rod; the obtained slotted core rod has large thickness and large hardness of an extrusion strengthening part, and the slotted core rod is not easy to generate plastic deformation in the hole extrusion strengthening process, so that the slotted core rod hole extrusion strengthening tool can be repeatedly used; the surface roughness of the extrusion strengthening part of the slotted core rod is low, and the surface quality of the hole wall after extrusion strengthening is improved.
The technical scheme is as follows: in order to realize the purpose of the invention, the invention adopts the following technical scheme:
a single-side extrusion reinforced slotted core rod processing method comprises the following steps:
(1) Selecting a bar for processing a slotted extrusion core rod
The material selected for processing the slotted extrusion core rod is W6Mo5Cr4V2 high-speed steel. The W6Mo5Cr4V2 high-speed steel has the characteristics of fine and uniform carbide, high toughness, good thermoplasticity, high wear resistance and the like, and can be used for manufacturing wear-resistant parts under high load.
(2) Blanking bar stock for processing slotted extrusion core rod based on hole structural member structural parameters
And selecting W6Mo5Cr4V2 high-speed steel bars with corresponding diameters according to the initial hole diameter or the nominal hole diameter of the hole structural member, and blanking the W6Mo5Cr4V2 high-speed steel bars based on the working stroke of the slotted core rod in the hole extrusion strengthening process.
(3) Roughly processing the blanked bar stock by referring to the design drawing of the slotted extrusion core rod to form a solid extrusion core rod
And (3) roughly processing the W6Mo5Cr4V2 high-speed steel after blanking by 1mm to form a solid extrusion core rod, wherein the solid extrusion core rod mainly comprises a connecting section, a guide section, a front conical section, a working ring, a rear conical section and the like.
(4) Solid extrusion core rod integral quenching
And integrally quenching the solid extrusion core rod at the quenching temperature of 1100 ℃ to ensure that the microhardness HRC of the solid extrusion core rod is 35-45.
(5) Local annealing of extrusion strengthening part of solid core rod
And (3) locally annealing the front conical section, the working ring, the rear conical section and other parts of the solid extrusion core rod after the integral quenching by using a high-frequency machine, wherein the annealing temperature is 800 ℃, so that the micro-hardness HRC of the front conical section, the working ring, the rear conical section and other parts of the extrusion core rod is 62-66.
(6) The solid extrusion core rod is provided with a central hole for placing the supporting rod
The solid extrusion core rod is provided with a central hole which is a through hole and used for placing the support rod. The center hole is a through hole, and the supporting rod can be arranged at the same side of the hole structural member, so that the hole structural member and the supporting rod are arranged at the same side.
(7) The extrusion strengthening part of the solid extrusion core rod is provided with a straight seam to form the slotted extrusion core rod
The extrusion strengthening part of the solid extrusion core rod is provided with a straight seam, before the hole extrusion strengthening, the extrusion strengthening part is contracted to ensure that the diameter of the working ring is smaller than the initial hole diameter of the hole structural member, the hole structural member is arranged on the front side and is placed on the guide section of the slotted core rod, and the slotted core rod does not extrude and strengthen the hole wall of the structural member in the installation process of the hole structural member.
(8) Finish machining is carried out on the slotted extrusion core rod to ensure that the slotted extrusion core rod meets the requirements of design size and roughness
(9) Polishing the extrusion strengthening part of the slotted core rod to ensure that the part meets the design requirement
The front taper section, the working ring and the rear taper of the slotted core rod are extrusion strengthening parts, the slotted core rod is in contact with the hole wall of the structural member in the hole extrusion strengthening process, and the surface roughness of the extrusion strengthening parts is closely related to the surface quality of the hole wall after the extrusion strengthening. Therefore, after the slit mandrel is finished, the extrusion-strengthened portion is polished with a metallic brightener so that the surface roughness of the extrusion-strengthened portion is 0.1 μm.
Advantageous effects
The invention relates to a processing method of a single-side extrusion reinforced slotted core rod, which has the following advantages:
1. the slotted core rod obtained by processing can realize unilateral extrusion strengthening of the hole structural part. The slotted core rod is provided with a central hole, the working ring part is provided with a slot, the working ring part of the slotted core rod is contracted to ensure that the diameter of the working ring is smaller than the diameter of the primary hole of the hole structural member, the hole structural member can be arranged on the front side and placed on the guide section of the slotted core rod, the supporting rod is inserted from the same side, the working ring part is not contracted, the slotted core rod inserted into the supporting rod is pulled out reversely, and the extrusion strengthening of the hole structural member is realized.
2. The slotted core rod can be reused. In the process of extruding and strengthening the slotted core rod hole, the front conical section of the slotted core rod is firstly contacted with the hole structural member, the thickness of the slotted core rod is thin, and the front conical section of the slotted core rod is easy to break. The thickness of the single side of the slotted core rod is 1/2 of the diameter of the support rod, the slotted core rod is large in thickness, the hardness of the extrusion reinforced part is large, the extrusion reinforced part is not easy to generate plastic deformation in the slotted core rod hole extrusion reinforcing process, the slotted core rod can be repeatedly used, and the cost of the slotted core rod hole extrusion reinforcing process is reduced.
3. The surface quality of the hole wall is improved. In the extrusion strengthening process of the slotted core rod hole, the slotted core rod is directly contacted with the hole structural member, and the surface roughness of the extrusion strengthening part of the slotted core rod determines the surface roughness of the hole wall after extrusion strengthening. After the slotted core rod hole extrusion strengthening tool is subjected to finish machining, the front conical section, the working ring and the rear conical section of the slotted core rod are subjected to polishing treatment by using a metal brightener, so that the surface roughness of the front conical section, the working ring and the rear conical section is 0.1 mu m. After the slotted core rod hole is extruded and reinforced, the surface roughness of the hole wall of the structural member can be reduced, so that the surface quality of the hole wall of the structural member is improved.
Drawings
FIG. 1 is a single side extrusion reinforced slotted core rod;
fig. 2 is a split mandrel assembly process. Wherein, (a) the hole structural member is installed on the front side; (b) placing the hole structural member on the slotted core rod guide section; (c) inserting a support rod; and (d) reversely pulling out the slotted core rod inserted into the support rod.
FIG. 3 is a solid core rod assembly process. Wherein, (a) the hole structural member is installed on the front side; (b) placing the hole structural member on the solid core rod guide section; and (c) reversely drawing out the solid core rod.
Wherein, the connecting segment-1; a guide section-2; slotting-3; a front cone section-4; rear cone section-5; the thickness of the slotted core rod is-6; slotting core rod center hole-7; a working ring-8; a hole structure-9; a support rod-10; solid core rod-11.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
Example 1
A single-side extrusion reinforced slotted core rod processing method comprises the following steps:
(1) Selecting a bar for processing a slotted extrusion core rod
The material selected for processing the slotted extrusion core rod is W6Mo5Cr4V2 high-speed steel. The W6Mo5Cr4V2 high-speed steel has the characteristics of fine and uniform carbide, high toughness, good thermoplasticity, high wear resistance and the like, and can be used for manufacturing wear-resistant parts under high load.
(2) Blanking bar stock for processing slotted extrusion core rod based on hole structural member structural parameters
According to the initial hole diameter or the nominal hole diameter of the hole structural member, selecting W6Mo5Cr4V2 high-speed steel bars with corresponding diameters, and blanking the W6Mo5Cr4V2 high-speed steel bars based on the working stroke of the slotted core rod in the hole extrusion strengthening process.
(3) And roughly processing the blanked bar stock by referring to a design drawing of the slotted extrusion core rod to form the solid extrusion core rod.
And (3) roughly processing the W6Mo5Cr4V2 high-speed steel after blanking by 1mm to form a solid extrusion core rod, wherein the solid extrusion core rod mainly comprises a connecting section, a guide section, a front conical section, a working ring, a rear conical section and the like.
(4) Solid extrusion core rod integral quenching
And integrally quenching the solid extrusion core rod at the quenching temperature of 1100 ℃ to ensure that the microhardness HRC of the solid extrusion core rod is 35-45.
(5) Local annealing of extrusion strengthening part of solid core rod
And (3) locally annealing the positions of the front conical section 4, the working ring 8, the rear conical section 5 and the like by using a high-frequency machine at 800 ℃ to ensure that the microhardness HRC of the positions of the front conical section 4, the working ring 8, the rear conical section 5 and the like of the extrusion core rod is 62-66.
(6) The solid extrusion core rod is provided with a central hole for placing the supporting rod
The solid extrusion core rod is provided with a central hole 7 which is a through hole and is used for placing a support rod. The central hole is a through hole, and the supporting rod can be arranged at the same side of the hole structural member, so that the hole structural member and the supporting rod are arranged at the same side.
(7) The extrusion strengthening part of the solid extrusion core rod is provided with a straight seam to form the slotted extrusion core rod
The extrusion strengthening part of the solid extrusion core rod is provided with a straight seam, before the hole extrusion strengthening, the extrusion strengthening part is contracted to ensure that the diameter of the working ring is smaller than the initial hole diameter of the hole structural member, the hole structural member is arranged on the front side and is placed on the guide section of the slotted core rod, and the slotted core rod does not extrude and strengthen the hole wall of the structural member in the installation process of the hole structural member.
(8) Fine machining of slotted extrusion core rod to meet the requirement of design size and roughness
(9) Polishing the extrusion strengthening part of the slotted core rod to ensure that the part meets the design requirement
The front taper section, the working ring and the rear taper of the slotted core rod are extrusion strengthening parts, the slotted core rod is in contact with the hole wall of the structural member in the hole extrusion strengthening process, and the surface roughness of the extrusion strengthening parts is closely related to the surface quality of the hole wall after the extrusion strengthening. Therefore, after the finish machining of the slotted core rod, the extrusion-strengthened part is polished with a metal brightener so that the surface roughness of the extrusion-strengthened part is 0.1 μm.
FIG. 1 is a schematic structural view of the resulting single-sided extrusion-strengthened slotted core rod, which mainly comprises a connecting section 1; a guide section 2; slotting 3; a front cone section 4; a rear cone section 5; the thickness of the slotted core rod is 6; a central bore 7; an operating ring 8. The connecting section 1 is positioned at the tail end of the core rod and used for connection and plays a role in fixing; the guide section 2 is used for placing a hole structural member, and the hole structural member is placed at the slotted core rod guide section 2 when not extruded and reinforced; because the slotting 3 is arranged on the slotting core rod, the extrusion strengthening part of the slotting core rod can contract, the same side installation of the hole structural part and the supporting rod can be realized, and the single side extrusion strengthening of the hole structural part can be realized; the central hole 7 is positioned at the other end of the core rod and is used for placing a support rod; the front conical section 4 and the working ring 8 are used for extrusion strengthening of the structural member hole. The extrusion strengthening part of the slotted core rod is provided with a slot, when a support rod is not inserted, the extrusion strengthening part of the slotted core rod can be contracted, the slotted core rod and the support rod can be installed from the same side, the slotted core rod can realize unilateral extrusion strengthening, the extrusion strengthening part of the solid extrusion core rod cannot be contracted, the diameter of the extrusion strengthening part is larger than the diameter of a structural member hole, and the solid extrusion core rod cannot carry out unilateral extrusion strengthening.
Comparative example 2 solid core rod and slotted core rod hole extrusion strengthening process
And (3) extruding and strengthening process of the slotted core rod hole: because the slotting 3 is arranged on the slotting core rod, the working ring part of the slotting core rod is extruded before the hole extrusion strengthening, so that the diameter of the working ring part of the slotting core rod is smaller than the diameter of the initial hole of the hole structural part 9, the hole structural part 9 can be installed on the front side and is placed on the guiding section 2 of the slotting core rod, and the working ring 8 does not extrude and strengthen the hole wall of the structural part in the installation process of the hole structural part 9. The supporting rod 10 is inserted into the slotted core rod from the same side, the supporting action of the supporting rod 10 prevents the working ring part of the slotted core rod from contracting, and the diameter of the working ring is larger than the diameter of the initial hole of the hole structural part 9. And reversely pulling out the slotted core rod inserted into the support rod to realize single-side extrusion strengthening of the slotted core rod, as shown in fig. 2.
And (3) extruding and strengthening the solid core rod hole: the diameter of the connecting section of the solid core rod-11 is smaller than the diameter of the initial hole of the hole structural member, and the diameter of the working ring is larger than the diameter of the initial hole of the hole structural member, so that the hole structural member needs to be placed on the guide section from the connecting section of the solid core rod. And (4) reversely pulling out the solid core rod to realize extrusion strengthening of the hole structural member, as shown in figure 3.
Claims (7)
1. The method for processing the single-side extrusion reinforced slotted core rod is characterized by comprising the following steps of:
(1) Selecting a bar stock for processing the slotted extrusion core rod;
(2) Based on the structural parameters of the hole structural member, blanking a bar stock for processing the slotted extrusion core rod;
(3) Roughly processing the blanked bar stock by referring to a slotted extrusion core rod design drawing to form a solid extrusion core rod;
(4) Integrally quenching the solid extrusion core rod;
(5) Locally annealing the front conical section, the working ring and the rear conical section of the solid extrusion core rod;
(6) The solid extrusion core rod is provided with a central hole for placing a support rod;
(7) The extrusion strengthening part of the solid core rod is provided with a straight seam to form a slotted extrusion core rod;
(8) Finely processing the slotted extrusion core rod to meet the requirements of design size and roughness;
(9) And polishing the extrusion strengthening part of the slotted core rod to enable the part to meet the design requirement.
2. The single-side extrusion reinforced slotted core rod processing method according to claim 1, characterized in that: in the step (1), the material of the slotted extrusion core rod is W6Mo5Cr4V2 high-speed steel.
3. The single-side extrusion reinforced slotted core rod processing method according to claim 1, characterized in that: the quenching temperature of the integral quenching in the step (4) is 1100 ℃, so that the microhardness HRC of the extruded core rod is 35-45;
and (5) local annealing, namely, the micro-hardness HRC of the extrusion strengthening part is 62-66, and local annealing is carried out by using a high-frequency machine, wherein the annealing temperature is 800 ℃.
4. The single-side extrusion reinforced slotted core rod processing method according to claim 1, characterized in that: step (6), the central hole is a through hole, a support rod is placed in the central hole, and the support rod is matched with the slotted core rod hole in the extrusion strengthening process, so that the extrusion strengthening of the hole structural part is realized;
the supporting rod is inserted into the slotted core rod from the same side of the installation of the hole structural member, so that the unilateral operation of the installation of the hole structural member and the installation of the supporting rod is realized;
the slotting core rod extrusion strengthening part is provided with a slot, so that the diameter of a working ring of the slotting core rod is smaller than the diameter of an initial hole of the hole structural member, the hole structural member can be installed on the front side, and the slotting core rod does not extrude and strengthen the hole wall in the installation process of the hole structural member.
5. The single-side extrusion reinforced slotted core rod processing method according to claim 1, characterized in that: and (7) arranging the straight seam on the guide section, the front conical section, the working ring and the rear conical section, wherein the length of the seam is 1/2 of the total length of the slotted core rod.
6. The method for machining the single-sided extrusion reinforced slotted core rod as claimed in claim 1, wherein the method comprises the following steps: the thickness of the single side of the slotted core rod is 1/2 of the diameter of the support rod, so that the problem that the slotted core rod is large in thickness and difficult to shrink is solved.
7. The single-side extrusion reinforced slotted core rod processing method according to claim 1, characterized in that: and (3) polishing the front conical section, the working ring and the rear conical section of the split core rod by using a metal brightener to ensure that the surface roughness is 0.1 mu m.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE833378C (en) * | 1950-10-18 | 1952-03-06 | Ruhstrat Werke Fuer Feinmechan | Plug provided with a handle for experiment panels, test fields, etc. like |
| CN101078091A (en) * | 2007-06-26 | 2007-11-28 | 郑州航空工业管理学院 | Casting high speed steel cutter and preparation method thereof |
| CN105081111A (en) * | 2015-07-21 | 2015-11-25 | 贵州航太精密制造有限公司 | High performance extrusion device for mechanical connection |
| CN112961967A (en) * | 2021-02-03 | 2021-06-15 | 四川大学 | Single-side cold extrusion fatigue strengthening device and method for orifice of open pore structure |
| CN113601111A (en) * | 2021-07-21 | 2021-11-05 | 南京航空航天大学 | Method for processing multi-slot bushing |
| CN113977190A (en) * | 2021-11-23 | 2022-01-28 | 南京航空航天大学 | Ultrasonic vibration auxiliary hole extrusion strengthening device, design method and operation process thereof |
-
2022
- 2022-07-26 CN CN202210883217.6A patent/CN115213640B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE833378C (en) * | 1950-10-18 | 1952-03-06 | Ruhstrat Werke Fuer Feinmechan | Plug provided with a handle for experiment panels, test fields, etc. like |
| CN101078091A (en) * | 2007-06-26 | 2007-11-28 | 郑州航空工业管理学院 | Casting high speed steel cutter and preparation method thereof |
| CN105081111A (en) * | 2015-07-21 | 2015-11-25 | 贵州航太精密制造有限公司 | High performance extrusion device for mechanical connection |
| CN112961967A (en) * | 2021-02-03 | 2021-06-15 | 四川大学 | Single-side cold extrusion fatigue strengthening device and method for orifice of open pore structure |
| CN113601111A (en) * | 2021-07-21 | 2021-11-05 | 南京航空航天大学 | Method for processing multi-slot bushing |
| CN113977190A (en) * | 2021-11-23 | 2022-01-28 | 南京航空航天大学 | Ultrasonic vibration auxiliary hole extrusion strengthening device, design method and operation process thereof |
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