CN113399486B - Multi-section cold extrusion strengthening device and use method thereof - Google Patents
Multi-section cold extrusion strengthening device and use method thereof Download PDFInfo
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- CN113399486B CN113399486B CN202110674568.1A CN202110674568A CN113399486B CN 113399486 B CN113399486 B CN 113399486B CN 202110674568 A CN202110674568 A CN 202110674568A CN 113399486 B CN113399486 B CN 113399486B
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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
- B23P9/00—Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified
- B23P9/02—Treating or finishing by applying pressure, e.g. knurling
- B23P9/025—Treating or finishing by applying pressure, e.g. knurling to inner walls of holes by using axially moving tools
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/32—Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/04—Mandrels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
- B21D19/088—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws for flanging holes
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
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Abstract
The invention belongs to the technical field of machining equipment, and relates to a multi-section cold extrusion strengthening device which comprises a first extrusion core rod; and the second extrusion core rods are coaxially and detachably connected with each other through the first sleeve, the diameter of the second extrusion core rod behind is larger than that of the second extrusion core rod before, and the first extrusion core rod is detachably connected with the second extrusion core rod with the smallest diameter through the second sleeve. The extrusion device formed by combining the multiple sections of core rods with different sizes can finish continuous multi-section hole extrusion strengthening under the condition of one-time positioning, the single extrusion amount is small, the machining damage is effectively reduced, the roundness of the machined hole is ensured through the multi-section extrusion, the hole periphery appearance is effectively improved, for the strengthening type of the secondary core rod cold extrusion strengthening, the single extrusion amount is small, a bushing process is not required to be added, the time required by machining is saved, the machining efficiency is improved, the strengthening effect is further improved, the practicability is high, and the popularization is worthy.
Description
Technical Field
The invention belongs to the technical field of machining equipment, and particularly relates to a multi-section cold extrusion strengthening device and a using method thereof.
Background
The TB6 titanium alloy belongs to a beta type titanium alloy, has the characteristics of high strength, small density, good mechanical property, strong toughness and corrosion resistance, good compatibility with composite materials and the like, is widely applied to the production and manufacture of advanced airplane structures, but has higher processing difficulty and higher requirements on process level and process precision. Due to the need for mechanical connections, hole-series structures are widely found in aircraft structures. In the use process, the hole edge has a severe stress concentration phenomenon, and fretting wear exists between auxiliary structures such as a lining sleeve and the hole wall, so that the titanium alloy connecting hole structure has a high contact fatigue damage risk.
Past researches show that the surface microstructure morphology of the material is one of the main factors influencing the fatigue life of the structure, and factors such as the corrosion capability of the environment, the structure form and the size also influence the fatigue life of the structure. Aiming at the problem, the fatigue life of the hole is mainly prolonged from two aspects, on one hand, the structure is optimally designed, and the working environment is ensured; on the other hand, the hole periphery is strengthened, and the local fatigue life is prolonged. In actual production and application, anti-fatigue manufacturing technologies such as surface shot blasting, laser shock technology, rolling and cold extrusion technology and the like are mainly adopted to prolong the fatigue life of the structure. However, because the diameter of the part used on the airplane is small and the number of the holes is large, the method such as rolling, surface shot blasting and the like is not suitable, and the cold extrusion strengthening is less limited by conditions.
The cold extrusion strengthening of the existing airplane perforated part mainly adopts a one-time cold extrusion mode, and usually adopts an interference assembly or a core rod extrusion method. The interference assembly is that the elastic deformation of the material around the hole is utilized to expand and deform the hole to be sleeved on the connecting pieces such as bolts and rivets, and when the hole recovers, the tightening force to the connecting pieces is generated to connect the two parts, so that the method can generate tensile stress around the hole and reduce the amplitude of loading stress; the core rod extrusion is that an extrusion rod after lubrication treatment is forced to pass through an initial hole in an interference mode under the action of external load, after the extrusion rod passes through the initial hole, a plastic deformation layer is extruded by an outer elastic zone, an elastic-plastic deformation zone beneficial to residual compressive stress distribution is formed at the hole wall, when a hole-opening component is subjected to cyclic external load, the residual compressive stress can reduce tensile stress, so that average stress is reduced, expansion of fatigue microcracks is effectively reduced, the fatigue life of a structure is effectively prolonged, meanwhile, in order to reduce the abrasion of the hole wall, a method of an additional bushing (or a sleeve) can be adopted to separate the direct contact of the core rod and the hole wall, the bushing and the sleeve are different in that the bushing is taken out after extrusion, the sleeve is left in the hole to ensure the assembly of high interference amount, and the method of the additional bushing (or the sleeve) has complicated process, Subsequent reaming and fretting wear may be required.
In view of this, in the design and manufacture process, a secondary cold extrusion strengthening processing method is usually adopted to avoid the process problem of primary cold extrusion strengthening, and generally, a core rod extrusion is performed before the pressing bushing hole extrusion treatment, so that a residual compressive stress field with higher strength can be formed at the position of the perforated member, then the pressing bushing hole extrusion is performed, the extrusion amount of two times is smaller than that of the primary cold extrusion strengthening, but the comprehensive effect is better, the subsequent reaming procedure is not needed, the secondary cold extrusion strengthening has great advantages in improving the strengthening effect and ensuring the hole wall structure, but the processing technique is more complex, besides the two cold extrusion processes, the bush assembling process with higher precision requirement is also needed to be added, the single extrusion amount of the secondary cold extrusion strengthening is still larger, the damage to the surface of the hole wall cannot be ignored, and the fretting wear between the lining and the hole wall cannot be avoided.
When cold extrusion strengthening is carried out on a TB6 titanium alloy open-cell component, the main defects of the prior art methods are as follows:
(1) for the strengthening type of the direct extrusion of the primary core rod, in the cold extrusion strengthening process, the extrusion amount of the direct extrusion of the primary core rod is large, and large axial damage can be caused on the surface of the hole wall;
(2) for the strengthening type of the direct extrusion of the primary mandrel with the slotted liner, the slotted liner is adopted for primary cold extrusion in the cold extrusion strengthening process, and then the reaming procedure is required to be carried out on the open-pore member to ensure the roundness of the hole, but the reaming can damage an elastic-plastic deformation zone generated by the cold extrusion, thereby influencing the fatigue resistance of the open-pore member;
(3) for the reinforcement type of secondary mandrel cold extrusion reinforcement, in the cold extrusion reinforcement process, the single extrusion amount of the secondary cold extrusion reinforcement is still large, the axial damage to the surface of the hole wall cannot be ignored, the processing technology of the additional bushing is complex, the time is required to be consumed, the processing efficiency is low, and the fretting wear problem between the bushing (or the sleeve) and the hole wall also exists.
Disclosure of Invention
Accordingly, the present invention is directed to a multi-stage cold extrusion strengthening apparatus and a method for using the same to solve the above-mentioned problems.
The technical scheme of the invention is as follows:
a multi-stage cold extrusion strengthening device comprises:
a first extrusion mandrel;
and the second extrusion core rods are coaxially and detachably connected with each other through the first sleeve, the diameter of the second extrusion core rod behind is larger than that of the second extrusion core rod before, and the first extrusion core rod is detachably connected with the second extrusion core rod with the smallest diameter through the second sleeve.
Preferably, the first extrusion core rod includes:
the connecting rod comprises a first cylinder, a first cone frustum, a second cylinder and a first connecting rod which are fixedly connected and coaxially arranged in sequence, wherein a first external thread is formed in the circumference of the first connecting rod, the diameter of the second cylinder is larger than that of the first cylinder, and the diameter of the first cylinder is larger than that of the connecting rod.
Preferably, the end face of the first cylinder, which is away from the first cone frustum, the joint of the first cylinder and the first cone frustum, and the joint of the first cone frustum and the second cylinder are provided with rounded corners.
Preferably, the second extrusion core rod includes:
second connecting rod, third cylinder, second circular truncated cone, fourth cylinder and the third connecting rod of fixed connection and coaxial arrangement in proper order, third connecting rod, second connecting rod and the diameter of first connecting rod are the same, second external screw thread has all been seted up on the circumference of second connecting rod, third connecting rod, second external screw thread is the same with first external screw thread structural parameter, the diameter ratio of fourth cylinder is big than the diameter of third cylinder, the diameter ratio of third cylinder is big than the diameter of third connecting rod.
Preferably, the end face of the third cylinder, which faces away from the second conical table, the joint of the third cylinder and the second conical table, and the joint of the second conical table and the fourth cylinder are provided with rounded corners.
Preferably, the first sleeve and the second sleeve are identical in structure and respectively comprise a cylinder, and the inner wall of the cylinder is provided with an internal thread matched with the second external thread.
A use method of a multi-section cold extrusion strengthening device comprises the following steps:
selecting proper first extrusion core rods, a plurality of second extrusion core rods, a first sleeve and a second sleeve, connecting the plurality of second extrusion core rods in a pairwise coaxial and detachable manner through the first sleeve, wherein the diameter of the next second extrusion core rod is larger than that of the previous second extrusion core rod, and axially sleeving and connecting the first extrusion core rod and the second extrusion core rod with the smallest diameter through the second sleeve to form a multi-section cold extrusion strengthening device;
clamping a second extrusion core rod with the largest diameter on a power device, so that the multi-section cold extrusion pressing device is vertically arranged;
fixing the member to be processed on the supporting plane, wherein the opening is not shielded, and enough space is reserved for passing through the multi-section cold extrusion strengthening device;
lubricating the surface to be processed of the component to be processed with the hole and the surface of the multi-section cold extrusion strengthening device by using a lubricant;
placing the lower end of a first extrusion core rod in a hole to be processed, starting a power device, pushing the first extrusion core rod to pass through the hole to be processed, performing first-stage cold extrusion strengthening on a surface to be processed of the member to be processed with the hole, continuously pushing a second extrusion core rod section by section to pass through the hole to be processed, and performing multi-stage cold extrusion strengthening on the surface to be processed;
and after the multi-section cold extrusion strengthening is finished, reversely resetting, and withdrawing the multi-section cold extrusion strengthening device.
Compared with the prior art, the multi-section cold extrusion strengthening device and the use method provided by the invention can realize the aim of strengthening the hole cold extrusion for many times on the premise of smaller damage to the hole wall of the hole-opening component so as to prolong the fatigue life of the hole-opening component; in addition, compared with the strengthening type of direct extrusion of the primary mandrel and the direct extrusion of the primary mandrel with the additional slotted bush, the extrusion device formed by combining the multiple sections of mandrels with different sizes can complete continuous multi-section hole extrusion strengthening under the condition of primary positioning, the single extrusion amount is small, the processing damage is effectively reduced, the roundness of a processed hole is ensured through the multiple sections of extrusion, the appearance around the hole is effectively improved, for the strengthening type of cold extrusion strengthening of the secondary mandrel, the single extrusion amount is small, the additional bush process is not needed, the time required by processing is saved, the processing efficiency is improved, the strengthening effect is further improved, the practicability is high, and the popularization is worthy.
Drawings
FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present invention (three stages are taken as an example);
FIG. 2 is a schematic structural view of a first extrusion mandrel according to example 1 of the present invention;
FIG. 3 is a schematic structural view of a second extrusion mandrel according to example 1 of the present invention;
fig. 4 is a schematic cross-sectional view of a first sleeve according to embodiment 1 of the present invention.
Reference numerals:
1-first extrusion core rod, 2-second sleeve, 3-second extrusion core rod, 4-first sleeve, 5-third extrusion core rod, 6-first cylinder end face, 7-first cylinder, 8-first cone frustum, 9-second cylinder, 10-first connecting rod, 11-second connecting rod, 12-third cylinder, 13-second cone frustum, 14-fourth cylinder, 15-third connecting rod, 16-cylinder, 17-internal thread.
Detailed Description
The invention provides a multi-section cold extrusion strengthening device and a use method thereof, and the invention is explained below with reference to the structural schematic diagrams of fig. 1 to 4.
Example 1
As shown in fig. 1 and fig. 2, the multi-stage cold extrusion strengthening device provided by the present invention, as shown in fig. 1, takes three extrusion cores as an example, and comprises a first extrusion core 1, a second extrusion core 3, and a third extrusion core 5, and further comprises a second sleeve 2 and a first sleeve 4 for connection.
The first extrusion core rod 1 and the second extrusion core rod 3 are coaxially detachably connected through a second sleeve 2, the third extrusion core rod 5 and the second extrusion core rod 3 are coaxially detachably connected through a first sleeve 4, and the maximum diameters of the first extrusion core rod 1, the second extrusion core rod 3 and the third extrusion core rod 5 are gradually increased.
The first extrusion core rod 1 is formed by a guide section, an extrusion section and a rear connecting shaft neck along an axis, specifically, as shown in fig. 2, the first extrusion core rod is fixedly connected from left to right in sequence and coaxially arranged with a first cylinder 7, namely the guide section, a first truncated cone 8, namely the extrusion section, a second cylinder 9, namely the extrusion section, and a first connecting rod 10, namely the rear connecting shaft neck, wherein a first external thread is provided on the circumference of the first connecting rod 10, the diameter of the second cylinder is larger than that of the first cylinder, and the diameter of the first cylinder is larger than that of the connecting rod.
Furthermore, the end surface 6 of the first cylinder, the joint of the first cylinder 7 and the first truncated cone 8, and the joint of the first truncated cone 8 and the second cylinder 9 are all provided with rounded corners.
The second extrusion core rod 3 and the third extrusion core rod 5 have the same structure, and are composed of five parts of a front connecting journal, a guide section, an extrusion section and a rear connecting journal along the axial direction, as shown in fig. 3, the second extrusion core rod 3 and the third extrusion core rod 5 respectively comprise a second connecting rod 11, namely the front connecting journal, a third cylinder 12, namely the guide section, a second cone table 13, namely the extrusion section, a fourth cylinder 14, namely the extrusion section and a third connecting rod 15, namely the rear connecting journal, which are fixedly connected from left to right and coaxially arranged, the diameters of the third connecting rod 15, the second connecting rod 11 and the first connecting rod 10 are the same, second external threads are respectively arranged on the circumferences of the second connecting rod 11 and the third connecting rod 15, the second external threads have the same structural parameters as the first external threads, and the diameter of the fourth cylinder 14 is larger than that of the third cylinder 12, the diameter of the third cylinder 12 is larger than the diameter of the third connecting rod 11.
Furthermore, the end surface of the third cylinder 12 departing from the second truncated cone 13, the joint of the third cylinder 12 and the second truncated cone 13, and the joint of the second truncated cone 13 and the fourth cylinder 14 are all provided with rounded corners.
As shown in fig. 4, the second sleeve 2 and the first sleeve 4 have the same structure and both include a cylinder 16, an inner thread 17 matched with the second outer thread is formed on the inner wall of the cylinder 16, and the inner thread 17 can be matched with the outer threads on the first connecting rod 10, the second connecting rod 11 and the third connecting rod 15 to form a detachable mechanical connection, so that the first extrusion core rod 1, the second extrusion core rod 3 and the third extrusion core rod 5 are axially connected to form a multi-stage cold extrusion strengthening device.
Wherein the material of the first extrusion core rod 1, the second extrusion core rod 3 and the third extrusion core rod 5 which are coaxially arranged is W18Gr4VCo5 tool steel, the roughness Ra value of the working surface of the core rods is 0.2-0.4 μ M, and the material of the second sleeve 2 and the first sleeve 4 is 300M steel.
Further, the axial length of the front (rear) connecting journal is greater than the length of the external thread.
Furthermore, each guide section is a cylindrical structure, for a first extrusion mandrel, the axial two ends of a first cylinder 7 of the first extrusion mandrel are respectively connected with a first extrusion mandrel end surface 6 and a first cone frustum 8, a fillet transition exists at the joint of the first extrusion mandrel end surface 6 and the first cylinder 7, for other extrusion mandrels, the axial two ends of the guide section of the first extrusion mandrel are respectively connected with a front connecting shaft neck and an extrusion section, the guide section of the first extrusion mandrel is connected with the front connecting shaft neck through a transition shaft shoulder, a chamfer exists at the root of the shaft shoulder, and the fillet transition exists at the joint of the shaft shoulder and the guide section.
Further, the diameter of the first cylinder 7 is slightly smaller than the diameter of the hole to be processed, the diameter of the second extrusion core rod guide section is slightly larger than the diameter of the first cylinder 7 but smaller than the diameter of the second cylinder 9, the diameter of the third extrusion core rod guide section 12 is slightly larger than the diameter of the second extrusion core rod guide section 12 but smaller than the diameter of the second extrusion core rod extrusion section 14, and the diameter of the subsequent extrusion core rod guide section is always slightly larger than the diameter of the previous extrusion core rod guide section and smaller than the diameter of the previous extrusion core rod extrusion section.
Further, the diameter of the extrusion section is gradually increased from the guide section to the extrusion section, the extrusion section is in a circular truncated cone-shaped structure, the diameter of the small end of the extrusion section is smaller than or equal to that of the guide section, the diameter of the large end of the extrusion section is slightly larger than the diameter of the aperture to be processed, and the difference between the diameter of the large end and the diameter of the small end of the first conical frustum 8 is slightly larger than that between the diameter of the large end and the diameter of the small end of the extrusion section of other extrusion core rods.
Furthermore, each extrusion section is of a cylindrical structure, the diameter of each extrusion section is equal to or slightly smaller than that of the extrusion section connected with the extrusion section, and the diameter of each extrusion section is larger than the diameter of the hole to be processed.
Further, there is a shoulder at the connection of the extrusion section to which each rear connecting journal is connected.
Further, the length of each extrusion core rod connecting sleeve is less than or equal to the sum of the thread lengths of the front connecting journal and the rear connecting journal of the extrusion core rod.
The use method of the multi-section cold extrusion strengthening device comprises the following steps:
selecting a proper first extrusion core rod 1, a proper second extrusion core rod 3, a proper third extrusion core rod 5, a proper second sleeve 2 and a proper first sleeve 4, connecting the first extrusion core rod 1 and the second extrusion core rod 3 through the second sleeve 2, and axially connecting the second extrusion core rod 3 and the third extrusion core rod 5 through the first sleeve 4 in a sleeved mode, so that the multi-section cold extrusion strengthening device is formed;
clamping the third extrusion core rod 5 on the power device, so that the multi-section cold extrusion strengthening device is vertically arranged;
fixing the member to be processed on the supporting plane, wherein the opening is not shielded, and enough space is reserved for passing through the multi-section cold extrusion strengthening device;
lubricating the surface to be processed of the component to be processed with the hole and the surface of the multi-section cold extrusion strengthening device by using a lubricant;
placing the lower end of a first extrusion core rod 1 in a hole to be processed, starting a power device, pushing the first extrusion core rod 1 to pass through the hole to be processed, and performing first-section cold extrusion strengthening on the surface to be processed of the component to be processed with the hole;
continuously pushing the second extrusion core rod 3 section by section to pass through the hole to be processed, and carrying out second-section cold extrusion strengthening on the surface to be processed;
continuously pushing the third extrusion core rod 5 section by section to pass through the hole to be processed, and carrying out third-section cold extrusion strengthening on the surface to be processed;
and after the three-section cold extrusion strengthening is finished, reversely resetting, and withdrawing the multi-section cold extrusion strengthening device.
The invention has the beneficial effects that:
(1) compared with primary or secondary cold extrusion strengthening, the multi-section hole extrusion strengthening aiming at the TB6 titanium alloy perforated member has the advantages that the extrusion times are more, the stress on each part of the hole wall is more uniform, the surface roughness is lower, the radial distribution of an elastic-plastic deformation area is more uniform, fatigue cracks are initiated around the hole, the crack propagation rate is slower, and the fatigue life of the perforated member is more effectively strengthened;
(2) the invention does not need to add a pressing bush or a slotted bush to avoid the surface damage of the hole wall, avoids the fretting wear damage of the bush to the surface of the hole wall, simultaneously does not need a subsequent reaming procedure to ensure the roughness of the hole wall, and greatly saves the processing time;
(3) in the invention, the extrusion core rods are mechanically connected, so that the connection is tight and the extrusion core rods can bear large load;
(4) according to the invention, aiming at a hole with a certain size, except a specific first extrusion core rod, other extrusion core rods can be modularly combined according to the requirement;
(5) the invention can carry out one-time multi-section continuous hole extrusion on the hole-opening component under the condition of one-time positioning, thereby effectively improving the fatigue life of the hole-opening component.
The above disclosure is only for the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (3)
1. A multi-section cold extrusion strengthening device is characterized by comprising:
a first extrusion mandrel;
the second extrusion core rods are coaxially and detachably connected with each other through the first sleeve, the diameter of the next second extrusion core rod is larger than that of the previous second extrusion core rod, and the first extrusion core rod is detachably connected with the second extrusion core rod with the smallest diameter through the second sleeve;
the first sleeve and the second sleeve are identical in structure and respectively comprise a cylinder, and an inner thread matched with the second outer thread is formed in the inner wall of the cylinder;
the first extrusion mandrel comprises:
the connecting rod is fixedly connected with a first cylinder, a first cone frustum, a second cylinder and a first connecting rod which are coaxially arranged in sequence, wherein a first external thread is formed on the circumference of the first connecting rod, the diameter of the second cylinder is larger than that of the first cylinder, and the diameter of the first cylinder is larger than that of the connecting rod;
the end surface of the first cylinder, which is far away from the first cone frustum, the joint of the first cylinder and the first cone frustum and the joint of the first cone frustum and the second cylinder are provided with fillets;
the second extrusion core rod includes:
second connecting rod, third cylinder, second circular truncated cone, fourth cylinder and the third connecting rod of fixed connection and coaxial arrangement in proper order, third connecting rod, second connecting rod and the diameter of first connecting rod are the same, second external screw thread has all been seted up on the circumference of second connecting rod, third connecting rod, second external screw thread is the same with first external screw thread structural parameter, the diameter ratio of fourth cylinder is big than the diameter of third cylinder, the diameter ratio of third cylinder is big than the diameter of third connecting rod.
2. The multi-stage cold extrusion strengthening device of claim 1, wherein the end surface of the third cylinder facing away from the second truncated cone, the connection between the third cylinder and the second truncated cone, and the connection between the second truncated cone and the fourth cylinder are rounded.
3. The method of claim 1, comprising the steps of:
selecting proper first extrusion core rods, a plurality of second extrusion core rods, a first sleeve and a second sleeve, connecting the plurality of second extrusion core rods in a pairwise coaxial and detachable manner through the first sleeve, wherein the diameter of the latter second extrusion core rod is larger than that of the former second extrusion core rod, and axially sleeving and connecting the first extrusion core rod and the second extrusion core rod with the smallest diameter through the second sleeve, so that the multi-stage cold extrusion strengthening device is formed;
clamping the second extrusion core rod with the largest diameter on a power device, so that the multi-section cold extrusion strengthening device is vertically arranged;
fixing the member to be processed on the supporting plane, wherein the opening is not shielded, and enough space is reserved for passing through the multi-section cold extrusion strengthening device;
lubricating the surface to be processed of the component to be processed with the hole and the surface of the multi-section cold extrusion strengthening device by using a lubricant;
placing the lower end of a first extrusion core rod in a hole to be processed, starting a power device, pushing the first extrusion core rod to pass through the hole to be processed, performing first-section cold extrusion strengthening on a surface to be processed of the member to be processed with the hole, continuously pushing a second extrusion core rod section by section to pass through the hole to be processed, and performing multi-section cold extrusion strengthening on the surface to be processed;
and after the multi-section cold extrusion strengthening is finished, reversely resetting, and withdrawing the multi-section cold extrusion strengthening device.
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| CN202110674568.1A CN113399486B (en) | 2021-06-17 | 2021-06-17 | Multi-section cold extrusion strengthening device and use method thereof |
| DE102022113360.5A DE102022113360B4 (en) | 2021-06-17 | 2022-05-26 | MULTIPLE COLD EXTRUSION REINFORCEMENT DEVICE AND METHOD OF USE THEREOF |
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| CN114085968B (en) * | 2021-11-19 | 2023-08-11 | 成都浩益科技有限公司 | Method for reinforcing cold extrusion assembly holes of slotted bushing and matched tooling device |
| CN114260330B (en) * | 2021-11-29 | 2023-09-12 | 中国兵器工业第五九研究所 | Accurate preparation method of superfine crystal tissue thin-wall conical part |
| CN115044755B (en) * | 2022-06-28 | 2023-12-15 | 陕西大工旭航电磁科技有限公司 | Hole dynamic cold extrusion device based on electromagnetic force and cold extrusion method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101778680A (en) * | 2007-08-10 | 2010-07-14 | 住友金属工业株式会社 | Plug for cold drawing and production method of metal pipe |
| KR20110137537A (en) * | 2010-06-17 | 2011-12-23 | 한국기술교육대학교 산학협력단 | Variable section extrusion molding apparatus |
| WO2012092923A2 (en) * | 2011-01-07 | 2012-07-12 | Sms Meer Gmbh | Indirect extrusion press and method for indirect extrusion |
| CN203281646U (en) * | 2013-05-07 | 2013-11-13 | 太原市冶金机械厂 | Top pinch roll for hot-continuous-rolling steel coiling machine |
| CN104525599A (en) * | 2014-12-17 | 2015-04-22 | 浙江名将汽配有限公司 | Cold extrusion mold for output shafts and preparation method thereof |
| WO2018064771A1 (en) * | 2016-10-06 | 2018-04-12 | Exco Technologies Limited | Tool steel composition for component of die-casting apparatus or of extrusion press |
| CN208275957U (en) * | 2018-04-19 | 2018-12-25 | 太仓久信精密模具股份有限公司 | A kind of cold extrusion shaft member hard alloy combined die |
| CN210586441U (en) * | 2019-09-19 | 2020-05-22 | 陕西迈堃科学技术有限公司 | Draw rifle adapter |
| CN211938448U (en) * | 2019-12-31 | 2020-11-17 | 青岛泽奥工贸有限公司 | Cold drawing die |
| WO2021062415A1 (en) * | 2019-09-27 | 2021-04-01 | Battelle Memorial Institute | Shape processes, feedstock materials, conductive materials, and/or assemblies |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE946535C (en) | 1955-02-24 | 1956-08-02 | Schloemann Ag | Working method for reloading in continuous extrusion on a double block press |
| JP2000135510A (en) * | 1998-10-28 | 2000-05-16 | Sumitomo Metal Ind Ltd | Expansion equipment of billet for extrusion |
| EP2273064A1 (en) * | 1998-12-22 | 2011-01-12 | Weatherford/Lamb, Inc. | Procedures and equipment for profiling and jointing of pipes |
| US7537290B2 (en) * | 2005-12-16 | 2009-05-26 | U.S. Manufacturing Company | Light weight, stiffened, twist resistant, extruded vehicle axle |
| EP1803526B1 (en) * | 2005-12-28 | 2017-03-15 | Fatigue Technology, Inc. | Mandrel assembly and method of using the same |
| JP5350150B2 (en) * | 2009-09-08 | 2013-11-27 | 昭和電工株式会社 | Extrusion dies |
| US8388292B2 (en) * | 2009-12-07 | 2013-03-05 | The Boeing Company | Self expanding fastener |
| WO2011084624A2 (en) * | 2009-12-16 | 2011-07-14 | Fatigue Technology, Inc. | Modular nut plate assemblies and methods of using the same |
| JP5497557B2 (en) * | 2010-07-05 | 2014-05-21 | 昭和電工株式会社 | Extrusion dies |
| DE102012021787B4 (en) * | 2012-07-27 | 2017-09-21 | Sms Group Gmbh | Direct or indirect pipe extrusion process, mandrel for pressing pipes, tube extruder and extruded pipe |
| US20140070039A1 (en) * | 2012-09-13 | 2014-03-13 | Siemens Vai Metals Technologies Gmbh | Rolling mill coil-forming laying head with unistructural path and deflector guide trough support |
| TWI530385B (en) * | 2013-04-26 | 2016-04-21 | Metal Ind Res &Development Ct | Fracturing Extrusion Device, Extrusion Extrusion Machine and Extrusion Method |
| CN103551415B (en) * | 2013-11-13 | 2015-05-20 | 哈尔滨理工大学 | Variable cross-section twisting and molding device and method for metal material |
| CN104384227B (en) * | 2014-11-06 | 2016-05-18 | 芜湖鑫力管道技术有限公司 | Composite copper water pipe is interior mould frock assembly once |
| CN106903178B (en) * | 2017-02-17 | 2019-06-18 | 清华大学 | A kind of extruder with Combined extrusion axis |
| CN106929650A (en) * | 2017-04-24 | 2017-07-07 | 宝鸡比优特材料有限公司 | A kind of method for improving the abrasion of potassium steel parts initial stage |
| CN110216163B (en) * | 2019-07-04 | 2020-10-27 | 西北工业大学 | Conical nozzle bushing plate integral impact extrusion composite forming die and forming method |
| CN111975283B (en) * | 2020-07-24 | 2023-03-14 | 中国航发北京航空材料研究院 | Cold extrusion method and tool for prolonging cycle life of wheel disc with bolt holes |
| CN112359189B (en) * | 2020-10-26 | 2021-09-28 | 山东大学 | Hole extrusion multiple strengthening device and method |
-
2021
- 2021-06-17 CN CN202110674568.1A patent/CN113399486B/en active Active
-
2022
- 2022-05-26 DE DE102022113360.5A patent/DE102022113360B4/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101778680A (en) * | 2007-08-10 | 2010-07-14 | 住友金属工业株式会社 | Plug for cold drawing and production method of metal pipe |
| KR20110137537A (en) * | 2010-06-17 | 2011-12-23 | 한국기술교육대학교 산학협력단 | Variable section extrusion molding apparatus |
| WO2012092923A2 (en) * | 2011-01-07 | 2012-07-12 | Sms Meer Gmbh | Indirect extrusion press and method for indirect extrusion |
| CN203281646U (en) * | 2013-05-07 | 2013-11-13 | 太原市冶金机械厂 | Top pinch roll for hot-continuous-rolling steel coiling machine |
| CN104525599A (en) * | 2014-12-17 | 2015-04-22 | 浙江名将汽配有限公司 | Cold extrusion mold for output shafts and preparation method thereof |
| WO2018064771A1 (en) * | 2016-10-06 | 2018-04-12 | Exco Technologies Limited | Tool steel composition for component of die-casting apparatus or of extrusion press |
| CN208275957U (en) * | 2018-04-19 | 2018-12-25 | 太仓久信精密模具股份有限公司 | A kind of cold extrusion shaft member hard alloy combined die |
| CN210586441U (en) * | 2019-09-19 | 2020-05-22 | 陕西迈堃科学技术有限公司 | Draw rifle adapter |
| WO2021062415A1 (en) * | 2019-09-27 | 2021-04-01 | Battelle Memorial Institute | Shape processes, feedstock materials, conductive materials, and/or assemblies |
| CN211938448U (en) * | 2019-12-31 | 2020-11-17 | 青岛泽奥工贸有限公司 | Cold drawing die |
Non-Patent Citations (1)
| Title |
|---|
| 芯棒规格对孔挤压强化效果的影响;卢国鑫;《制造业自动化》;20140930;第36卷(第9期);第34-38、48页 * |
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| DE102022113360A1 (en) | 2022-12-22 |
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| DE102022113360B4 (en) | 2023-06-29 |
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