CN115213640B - Machining method of unilateral extrusion reinforced slotting core rod - Google Patents
Machining method of unilateral extrusion reinforced slotting core rod Download PDFInfo
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- CN115213640B CN115213640B CN202210883217.6A CN202210883217A CN115213640B CN 115213640 B CN115213640 B CN 115213640B CN 202210883217 A CN202210883217 A CN 202210883217A CN 115213640 B CN115213640 B CN 115213640B
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- 238000001125 extrusion Methods 0.000 title claims abstract description 196
- 238000000034 method Methods 0.000 title claims description 42
- 238000003754 machining Methods 0.000 title claims description 15
- 238000005728 strengthening Methods 0.000 claims abstract description 74
- 239000007787 solid Substances 0.000 claims abstract description 56
- 238000012545 processing Methods 0.000 claims abstract description 18
- 229910000997 High-speed steel Inorganic materials 0.000 claims abstract description 17
- 238000000137 annealing Methods 0.000 claims abstract description 15
- 238000010791 quenching Methods 0.000 claims abstract description 13
- 230000000171 quenching effect Effects 0.000 claims abstract description 13
- 238000013461 design Methods 0.000 claims abstract description 11
- 238000003672 processing method Methods 0.000 claims abstract description 9
- 230000003746 surface roughness Effects 0.000 claims description 12
- 238000011282 treatment Methods 0.000 claims description 7
- 238000005282 brightening Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 238000011900 installation process Methods 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 abstract description 21
- 239000000463 material Substances 0.000 abstract description 14
- 239000011148 porous material Substances 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 16
- 239000010959 steel Substances 0.000 description 16
- 238000002360 preparation method Methods 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 238000000265 homogenisation Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005242 forging Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000000641 cold extrusion Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012552 review Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 208000035480 Ring chromosome 8 syndrome Diseases 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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- 238000013000 roll bending Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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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
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Abstract
The invention provides a unilateral extrusion reinforced slotting core rod processing method, which comprises the following steps: (1) Selecting a slotting extrusion mandrel material as W6Mo5Cr4V2 high-speed steel; (2) Blanking the W6Mo5Cr4V2 high-speed steel bar material based on the primary hole diameter of the extruded hole structural member; (3) Roughly processing the blanked W6Mo5Cr4V2 high-speed steel bar material by using a slotted extrusion core rod design drawing to form a solid extrusion core rod; (4) integral quenching of the solid extrusion core rod; (5) locally annealing the extrusion reinforced part of the solid core rod; (6) the solid extrusion core rod is provided with a central hole; (7) The solid core rod extrusion strengthening part is provided with a slit, so that the solid core rod extrusion strengthening part becomes a slit extrusion core rod; (8) Finishing the slotted extrusion core rod to enable the slotted extrusion core rod to meet the requirements of design size and roughness; (9) The extrusion strengthening part of the slotted core rod is polished, so that the part meets the design requirement. The invention has simple structure and convenient operation, can realize unilateral extrusion reinforcement of the pore structure member, and improves the fatigue performance of the pore structure member.
Description
The application is directed to a technology for cold extrusion reinforcement of an assembly hole by using a slotted core rod, which is continuously researched and improved aiming at the patent number ZL202011447830 and the invention name.
Technical Field
The invention discloses a method for machining a slotting core rod for unilateral extrusion reinforcement, belongs to the technical field of precision machining for hole extrusion reinforcement, and particularly relates to a method for machining a slotting core rod hole extrusion reinforcement tool capable of achieving unilateral extrusion reinforcement.
Background
Most structural components on the aircraft are connected through installing the fastener in the mounting hole, and owing to the existence of mounting hole, make structural component material discontinuous on the structural component, produce stress concentration, easily initiate fatigue crack, increase fatigue crack extension rate. 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 compression stress field to counteract tensile stress generated by externally applied alternating load, so that the fatigue performance of the hole structural member is improved.
The extrusion of the core rod hole belongs to direct extrusion reinforcement, the extrusion core rod is in direct contact with the hole wall of the structural member in the hole extrusion reinforcement process, the extrusion quantity is totally acted on the hole wall, the structure is simple, and the operation is convenient. The extrusion core rod used in the core rod extrusion reinforcement is classified into a solid core rod and a slit core rod. Wherein, the solid core rod can not carry out unilateral extrusion strengthening, large extrusion quantity extrusion strengthening and the like, and the extrusion strengthening conditions are limited.
The Chinese patent document with publication number of CN112680677A proposes a process for reinforcing an assembly hole by cold extrusion of a slotted core rod, which comprises the following steps: before cold extrusion strengthening is performed on the extruded workpiece assembly holes, the front surface of the slotted core rod sequentially passes through the auxiliary plate and the extruded workpiece assembly holes; the slotted core rod is symmetrically provided with a plurality of slits, so that the slotted core rod working ring can be contracted, and extrusion strengthening is not carried out on the extruded workpiece assembly holes. And inserting a supporting rod into the slotted core rod, wherein the position of the slotted core rod working ring is not contractible, the diameter of the slotted core rod working ring is larger than the aperture of an assembly hole of an extruded workpiece, and the slotted core rod working ring extrudes the wall of the assembly hole to enable the wall of the assembly hole to be plastically deformed in the process of uniformly pulling out the slotted core rod, so that the strengthening effect is realized. The invention does not need a lining in the hole extrusion strengthening process, eliminates the consumption of the lining in the extrusion process, thereby improving the extrusion strengthening effect.
In the general description of the preparation technology of the slotted bushing of weapon materials science and engineering, 2013,36 (6)' in the general description of the application condition and the current research situation of the slotted bushing at home and abroad, the main characteristics and the preparation principle of the slotted bushing are introduced, the existing problems of the preparation technology of the slotted bushing are analyzed by comparing the advantages and disadvantages of the slotted bushing at home and abroad, and the method has important guiding significance for improving the preparation technology of the slotted bushing. This document mainly reviews the technique of manufacturing split bush, the split bush differs from the split core rod: (1) the preparation process is different. The preparation technology of the slotting bush is reviewed in the description, roll bending forming is used for the slotting bush, and the slotting core rod is mainly formed by working procedures such as material selection, blanking, rough machining, integral quenching, local annealing, slotting, finish machining and the like. (2) the principle of hole extrusion strengthening is different. In the extrusion strengthening process of the slotted bush hole, the extrusion core rod is in indirect contact with the wall of the structural member, the extrusion amount part acts on the wall of the structural member, the extrusion core rod extrudes the slotted bush, the slotted bush elastically deforms to extrude and strengthen the wall of the structural member, and the wall of the structural member elastically and plastically deforms to realize extrusion strengthening of the structural member of the hole; in the extrusion strengthening process of the slotted core rod hole, the slotted core rod is in direct contact with the hole wall of the structural member, the extrusion quantity is fully acted on the hole wall, the slotted core rod extrudes and strengthens the hole wall of the structural member, the hole wall material is subjected to extrusion force to generate elastic plastic deformation, and extrusion strengthening of the hole structural member is realized. Therefore, the processing method of the unilateral extrusion reinforced slotting core rod is remarkably different from the technical review of the preparation of the slotting lining.
The authorized bulletin number is: chinese patent document CN108103288B proposes a method for producing a mandrel bar for a seamless steel pipe and a mandrel bar for a seamless steel pipe. The preparation method mainly comprises the steps of steel ingot casting, primary homogenization treatment, radial forging stock manufacture, secondary homogenization treatment, core rod blank preparation, grain refinement treatment and the like. By adopting the preparation method of the core rod for the seamless steel pipe, the twice high-temperature diffusion homogenization and the radial forging stock manufacture are organically combined with the forging of the core rod blank, the dynamic conditions favorable for the diffusion of carbon and alloy elements are created, and the core rod material matrix structure with extremely homogenized carbon and alloy elements distributed in a steel matrix is obtained within the same or shorter homogenization time, so that the prepared core rod has the characteristics of high toughness, high red hardness and long service life, and has better performance. The main difference between this patent document and the present patent document is: (1) different processing techniques. The preparation process of the core rod for the seamless steel tube mainly comprises the steps of steel ingot casting, primary homogenization treatment, radial forging stock manufacture, secondary homogenization treatment, core rod blank preparation, grain refinement treatment and the like, and the processing process of the slotted core rod mainly comprises the following steps ofThe processing technology of the two core rods is obviously different from the processing technology of the two core rods in the working procedures of material selection, blanking, rough machining, integral quenching, local annealing, slotting, finish machining and the like. (2) the raw materials constituting the core rod are different. The core rod for a seamless steel pipe is cast from a steel ingot, the raw material components constituting the core rod are cast to form the steel ingot, and the raw material components constituting the core rod include, in wt%: 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 slotting core rod is W6Mo5Cr4V2 high-speed steel, and the raw material components for forming the slotting core rod comprise the following components in percentage by weight: mn 0.15-0.40%, S less than or equal to 0.030%, P less than or equal to 0.030%, cr 3.80-4.40%, ni less than or equal to 0.30%, V1.75-2.20%, mo 4.50-5.50%, W5.50-6.75. The materials of the core rod for the seamless steel pipe and the material composition of the slotting core rod are obviously different. (3) Heat treated form. Four heat treatments are carried out in the processing process of the core rod for the seamless steel pipe, and two heat treatments are carried out in the processing process of the slotted core rod, wherein the positions of the two heat treatments are different, the blanked bar is processed into a solid core rod, the solid extrusion core rod is integrally quenched, and the quenching temperature is 1100 ℃, so that the microhardness HRC of the extrusion core rod is 35-45; and then carrying out local annealing on the extrusion reinforced part of the extrusion core rod to ensure that the microhardness HRC of the extrusion reinforced part is 62-66, and carrying out local annealing by using a high-frequency machine, wherein the annealing temperature is 800 ℃. There are significant differences in the form of heat treatment. (4) technical field is different. A preparation method of a mandrel for a seamless steel tube and the technical field of a mandrel patent document for the seamless steel tube belong to the technical field of hot work grinding tool steel manufacturing, and a slotting mandrel processing method patent document for unilateral extrusion reinforcement belongs to the technical field of hole extrusion reinforcement precision machining. (5) machining precision is different. The surface roughness of the core rod is not limited in the preparation process of the core rod for the seamless steel pipe, but the front cone section, the working ring and the rear cone section of the slotting core rod are polished by using a metal brightening agent in the preparation process of the slotting core rod, so that the surface roughness is 0.1 mu m. From this, it is clear that the method for producing a mandrel bar for a seamless steel pipe is significantly different from the method for processing a split mandrel bar reinforced by single-side extrusion.
In summary, the existing extrusion strengthening process for the slotted core rod hole does not explain the processing method of the slotted core rod, so that the extrusion strengthening process for the slotted core rod hole has not been popularized. Therefore, the invention provides a method for processing a slotting core rod for unilateral extrusion reinforcement, which realizes unilateral extrusion reinforcement of a hole structural member, repeatedly uses a hole extrusion reinforcement tool, improves the fatigue life of the hole structural member, and aims to popularize and apply the slotting core rod hole extrusion reinforcement process.
Disclosure of Invention
Aiming at the problem that the lining wall is thin and easy to generate serious plastic deformation in the extrusion strengthening process of a slotted lining hole, the lining 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, single-side operation and large extrusion quantity extrusion strengthening cannot be performed, the extrusion environment is limited, and the extrusion strengthening efficiency of the hole structural member is affected. Therefore, the invention provides a processing method of the slotting core rod reinforced by single-side extrusion by combining the slotting bush and the solid extrusion core rod. The invention can realize unilateral extrusion reinforcement of the slotted core rod; the obtained slotting core rod has large thickness and large hardness of the extrusion strengthening part, and the slotting core rod is not easy to generate plastic deformation in the hole extrusion strengthening process, so that the slotting core rod hole extrusion strengthening tool can be reused; 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 achieve the above object, the present invention adopts the following technical scheme:
a unilateral extrusion reinforced slotting core rod processing method comprises the following steps:
(1) Selecting bar stock for processing slotted extrusion mandrel
The material selected for processing the slotted extrusion core rod is W6Mo5Cr4V2 high-speed steel. The W6Mo5Cr4V2 high-speed steel has the characteristics of tiny 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 structural parameters of hole structural member
According to the primary hole diameter or the nominal hole diameter of the hole structural member, a W6Mo5Cr4V2 high-speed steel bar with a corresponding diameter is selected, and blanking is carried out on the W6Mo5Cr4V2 high-speed steel bar based on the working stroke of a slotted core rod in the hole extrusion strengthening process.
(3) Rough machining is carried out on the blanked bar stock by referring to a design drawing of the slotted extrusion core rod, so that the blanked bar stock becomes a solid extrusion core rod
The blanking W6Mo5Cr4V2 high-speed steel is roughly machined, the allowance is 1mm, the blanking W6Mo5Cr4V2 high-speed steel is made into a solid extrusion core rod, and the solid extrusion core rod mainly comprises a connecting section, a guiding section, a front cone section, a working ring, a rear cone section and the like.
(4) Integral quenching of solid extrusion core rod
And (3) carrying out integral quenching on the solid extrusion core rod, wherein the quenching temperature is 1100 degrees, and the microhardness HRC of the solid extrusion core rod is 35-45.
(5) Local annealing of solid mandrel extrusion reinforced part
And (3) locally annealing the parts of the front cone section, the working ring, the rear cone section and the like of the solid extrusion core rod after integral quenching by using a high-frequency machine, wherein the annealing temperature is 800 degrees, so that the microhardness HRC of the parts of the front cone section, the working ring, the rear cone section 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 support 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 installed on the same side from the hole structural member, so that the hole structural member and the supporting rod are installed on the same side.
(7) Straight slits are formed at the extrusion strengthening part of the solid extrusion core rod, so that the solid extrusion core rod becomes a slit extrusion core rod
The solid extrusion core rod extrusion strengthening part is provided with a straight slit, before hole extrusion strengthening, the extrusion strengthening part is contracted, so that the diameter of the working ring is smaller than the diameter of the primary hole of the hole structural member, the front surface of the hole structural member is installed and placed on the guide section of the slotting core rod, and the slotting core rod does not extrude and strengthen the hole wall of the structural member in the installation process of the hole structural member.
(8) Finishing the slotted extrusion core rod to enable the slotted extrusion core rod to meet the design size and roughness requirements
(9) Polishing the extrusion reinforced part of the slotted core rod to make the part meet the design requirement
The front cone section, the working ring and the rear taper of the slotted core rod are extrusion strengthening parts, the slotted core rod is contacted with the 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 wall of the hole after extrusion strengthening. Therefore, after finishing the slotted core rod, the extrusion reinforced part is polished by using a metal brightening agent, so that the surface roughness of the extrusion reinforced part is 0.1 mu m.
Advantageous effects
The processing method of the unilateral extrusion reinforced slotting core rod has the following advantages:
1. the slotted core rod obtained through processing can realize unilateral extrusion reinforcement of the hole structural member. The center hole is formed in the slotting core rod, the slotting is formed in the working ring part, the slotting core rod is contracted, the working ring diameter of the slotting core rod is smaller than the primary hole diameter of the hole structural member, the hole structural member can be installed in front, the hole structural member is placed in the slotting core rod guide section, the supporting rod is inserted from the same side, the working ring part is uncontractable, the slotting core rod inserted into the supporting rod is pulled out reversely, and extrusion strengthening of the hole structural member is achieved.
2. The slotted core rod can be reused. In the extrusion strengthening process of the slotted core rod hole, the front cone 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 cone section of the slotted core rod is easy to break. The unilateral thickness of the slotting core rod is 1/2 of the diameter of the support rod, the slotting core rod is large in thickness, the extrusion strengthening part is high in hardness, plastic deformation is not easy to occur at the extrusion strengthening part in the extrusion strengthening process of the slotting core rod hole, the slotting core rod can be reused, and the extrusion strengthening process cost of the slotting core rod hole is reduced.
3. Improving the surface quality of the hole wall. In the extrusion strengthening process of the slotted core rod hole, the slotted core rod is in direct contact 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 finishing the extrusion strengthening tool of the slotted core rod hole, polishing the front cone section, the working ring and the rear cone section of the slotted core rod by using a metal brightening agent to ensure that the surface roughness of the front cone section, the working ring and the rear cone section is 0.1 mu m. After the extrusion and reinforcement of the slotted core rod hole, the surface roughness of the hole wall of the structural part can be reduced, so that the surface quality of the hole wall of the structural part is improved.
Drawings
FIG. 1 is a single side extrusion reinforced split mandrel;
FIG. 2 is a slotted core assembly process. Wherein, (a) the front face of the hole structural member is provided; (b) placing the hole structural member in a slotted core rod guide section; (c) inserting a support rod; (d) reversely pulling out the slotted core rod inserted into the supporting rod.
Fig. 3 is a solid core rod assembly process. Wherein, (a) the front face of the hole structural member is provided; (b) placing the bore structure in a solid mandrel guide section; (c) pulling out the solid core rod in the opposite direction.
Wherein the connecting section-1; a guide section-2; slotting-3; front cone section-4; a rear cone section-5; the thickness of the slotted core rod is-6; a center hole-7 of the slotting core rod; a working ring-8; a hole structural member-9; a support bar-10; solid core rod-11.
Detailed Description
The invention will be described in further detail with reference to the drawings and examples.
Example 1
A unilateral extrusion reinforced slotting core rod processing method comprises the following steps:
(1) Selecting bar stock for processing slotted extrusion mandrel
The material selected for processing the slotted extrusion core rod is W6Mo5Cr4V2 high-speed steel. The W6Mo5Cr4V2 high-speed steel has the characteristics of tiny 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 structural parameters of hole structural member
According to the primary hole diameter or the nominal hole diameter of the hole structural member, a W6Mo5Cr4V2 high-speed steel bar with a corresponding diameter is selected, and blanking is carried out on the W6Mo5Cr4V2 high-speed steel bar based on the working stroke of a slotted core rod in the hole extrusion strengthening process.
(3) And (3) rough machining is carried out on the blanked bar stock by referring to a slotted extrusion core rod design drawing, so that the blanked bar stock becomes a solid extrusion core rod.
The blanking W6Mo5Cr4V2 high-speed steel is roughly machined, the allowance is 1mm, the blanking W6Mo5Cr4V2 high-speed steel is made into a solid extrusion core rod, and the solid extrusion core rod mainly comprises a connecting section, a guiding section, a front cone section, a working ring, a rear cone section and the like.
(4) Integral quenching of solid extrusion core rod
And (3) carrying out integral quenching on the solid extrusion core rod, wherein the quenching temperature is 1100 ℃, so that the microhardness HRC of the solid extrusion core rod is 35-45.
(5) Local annealing of solid mandrel extrusion reinforced part
And (3) carrying out local annealing on the parts of the front cone section 4, the working ring 8, the rear cone section 5 and the like of the solid extrusion core rod after integral quenching by using a high-frequency machine, wherein the annealing temperature is 800 ℃, so that the microhardness HRC of the parts of the front cone section 4, the working ring 8, the rear cone 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 support rod
The solid extrusion core rod is provided with a central hole 7 which is a through hole for placing the support rod. The center hole is a through hole, and the supporting rod can be installed on the same side from the hole structural member, so that the hole structural member and the supporting rod are installed on the same side.
(7) Straight slits are formed at the extrusion strengthening part of the solid extrusion core rod, so that the solid extrusion core rod becomes a slit extrusion core rod
The solid extrusion core rod extrusion strengthening part is provided with a straight slit, before hole extrusion strengthening, the extrusion strengthening part is contracted, so that the diameter of the working ring is smaller than the diameter of the primary hole of the hole structural member, the front surface of the hole structural member is installed and placed on the guide section of the slotting core rod, and the slotting core rod does not extrude and strengthen the hole wall of the structural member in the installation process of the hole structural member.
(8) Finishing the slotted extrusion core rod to enable the slotted extrusion core rod to meet the design size and roughness requirements
(9) Polishing the extrusion reinforced part of the slotted core rod to make the part meet the design requirement
The front cone section, the working ring and the rear taper of the slotted core rod are extrusion strengthening parts, the slotted core rod is contacted with the 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 wall of the hole after extrusion strengthening. Therefore, after finishing the slotted core rod, the extrusion reinforced part is polished by using a metal brightening agent, so that the surface roughness of the extrusion reinforced part is 0.1 mu m.
FIG. 1 is a schematic structural view of an obtained unilaterally extrusion reinforced 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 hole 7; a working ring 8. The connecting section 1 is positioned at the tail end of the core rod and used for connecting and fixing; the guide section 2 is used for placing a hole structural member, and when the extrusion reinforcement is not performed, the hole structural member is placed at the position of the slotted core rod guide section 2; because the slotting 3 is arranged on the slotting core rod, the extrusion strengthening part of the slotting core rod can shrink, and the same side installation of the hole structural member and the supporting rod can be realized, and the unilateral extrusion strengthening of the hole structural member 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 cone section 4 and the working ring 8 are used for extrusion reinforcement of the structural member hole. The extrusion strengthening part of the slotting core rod is provided with a slotting, when the supporting rod is not inserted, the extrusion strengthening part of the slotting core rod can be contracted, the slotting core rod and the supporting rod can be installed from the same side, the slotting core rod can realize unilateral extrusion strengthening, the solid extrusion core rod cannot be contracted, the diameter of the extrusion strengthening part is larger than that of a structural part hole, and the solid extrusion core rod cannot carry out unilateral extrusion strengthening.
Comparative example 2 solid mandrel and slotted mandrel hole extrusion strengthening Process
The extrusion strengthening process of the slotted core rod hole comprises the following steps: because the slotting 3 is arranged on the slotting core rod, the working ring part of the slotting core rod is extruded before hole extrusion strengthening, so that the diameter of the working ring part of the slotting core rod is smaller than the primary hole diameter of the hole structural member 9, the hole structural member 9 can be installed in front and placed on the slotting core rod guide section 2, and the working ring 8 does not extrude and strengthen the hole wall of the structural member in the installation process of the hole structural member 9. The support rod 10 is inserted into the slotting core rod from the same side direction, and the support effect of the support rod 10 ensures that the working ring part of the slotting core rod does not shrink, and the diameter of the working ring is larger than the diameter of the primary hole of the hole structural member 9. And (3) reversely pulling out the slotting core rod inserted into the support rod to realize unilateral extrusion reinforcement of the slotting core rod, as shown in figure 2.
The extrusion strengthening process of the solid core rod hole comprises the following steps: the diameter of the connecting section of the solid core rod-11 is smaller than the primary hole diameter of the hole structural member, and the diameter of the working ring is larger than the primary hole diameter 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 the solid core rod is pulled out reversely, so that extrusion strengthening of the pore structural part is realized, as shown in fig. 3.
Claims (1)
1. A unilateral extrusion reinforced slotting core rod processing method is characterized by comprising the following steps:
(1) Selecting W6Mo5Cr4V2 high-speed steel as a bar stock for processing a slotting extrusion mandrel;
(2) Blanking bars for processing the slotted extrusion core rod based on structural parameters of the hole structural member;
(3) Rough machining is carried out on the blanked bar stock by referring to a slotted extrusion core rod design drawing, so that the blanked bar stock is a solid extrusion core rod, and the solid extrusion core rod mainly comprises a connecting section, a guiding section, a front cone section, a working ring and a rear cone section;
(4) Quenching the whole solid extrusion core rod at 1100 deg.c to make the microhardness HRC of the extrusion core rod 35-45;
(5) Locally annealing the front cone section, the working ring and the rear cone section of the solid extrusion core rod to ensure that the microhardness HRC of the extrusion reinforced part is 62-66, and locally annealing by using a high-frequency machine at the annealing temperature of 800 ℃;
(6) The solid extrusion core rod is provided with a central hole, the central hole is a through hole and is used for placing a support rod, and the slotted core rod hole is matched with the support rod in the extrusion strengthening process to realize extrusion strengthening of a hole structural member;
the support rod is inserted into the slotted core rod from the same side of the hole structural member to realize unilateral operation of the hole structural member installation and the support rod installation;
the extrusion strengthening part of the slotting core rod is provided with a slotting, so that the diameter of a working ring of the slotting core rod is smaller than the diameter of the primary hole of the hole structural member, the hole structural member can be installed on the front surface, and the slotting core rod does not extrude and strengthen the hole wall in the installation process of the hole structural member;
(7) The extrusion strengthening part of the solid core rod is provided with a straight slit, so that the solid core rod is a slit extrusion core rod;
the straight slits are arranged on the guide section, the front cone section, the working ring and the rear cone section, and the lengths of the slits are 1/2 of the total length of the slit core rod;
the unilateral thickness of the slotted core rod is 1/2 of the diameter of the supporting rod;
(8) Finish machining is carried out on the slotted extrusion core rod, so that the slotted extrusion core rod meets the requirements of design size and roughness;
(9) The polishing treatment of the extrusion reinforced part of the slotted core rod is to polish the front cone section, the working ring and the rear cone section of the slotted core rod by using a metal brightening agent to ensure that the surface roughness of the front cone section, the working ring and the rear cone section of the slotted core rod is 0.1 mu m.
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| CN202210883217.6A CN115213640B (en) | 2022-07-26 | 2022-07-26 | Machining method of unilateral extrusion reinforced slotting core rod |
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| 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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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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