CN112359189B - Hole extrusion multiple strengthening device and method - Google Patents
Hole extrusion multiple strengthening device and method Download PDFInfo
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- CN112359189B CN112359189B CN202011155166.2A CN202011155166A CN112359189B CN 112359189 B CN112359189 B CN 112359189B CN 202011155166 A CN202011155166 A CN 202011155166A CN 112359189 B CN112359189 B CN 112359189B
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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
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
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Abstract
The invention discloses a multiple strengthening device and method for hole extrusion, which relates to the field of hole processing equipment and comprises a first core rod and a second core rod which are coaxially arranged and the ends of which are butted, wherein the first core rod is sequentially provided with a guide section, a first reducing section and a first matching section along the axial direction, the second core rod is sequentially provided with a second matching section and a second reducing section along the axial direction, the diameters of the first matching section and the second matching section are equal and are butted to form a cylindrical sleeving part for matching with a lining, the diameters of the large-diameter ends of the first reducing section and the second reducing section are both larger than the diameter of the sleeving part, and the device and method are used for applying a pressing lining to meet the assembly requirement of a porous component by improving the structure of the core rod and preparing a multi-time extrusion integrated core rod, the hole wall and the lining which need to be processed by extruding and strengthening the hole of the porous member are processed by one-time continuous extrusion, so that the processing efficiency can be greatly improved and the strengthening effect can be further improved.
Description
Technical Field
The disclosure relates to the field of hole machining equipment, in particular to a hole extrusion multiple strengthening device and method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The part with holes is a fatigue fracture failure prone area in a mechanical structure, and a residual compressive stress field with a certain depth is introduced around the hole of the part by adopting a hole extrusion method so as to prolong the fatigue life of the part. The metal material member hole extrusion treatment mainly comprises the modes of core rod unthreaded hole extrusion, bushing hole extrusion and the like. In order to meet the assembly requirement or protect the hole wall in the bushing extrusion process, the bushing is added before the extrusion process of the hole member. In the actual industrial production process, in order to further improve the strengthening effect, technicians can adopt a composite hole extrusion processing mode to strengthen the hole component twice.
The inventor finds that the composite hole extrusion is a combined process of core rod hole extrusion and hole extrusion with a liner, and requires that core rod unthreaded hole extrusion is performed for one time before ordinary hole extrusion with the liner, so that a residual compressive stress field with higher strength can be formed on a component substrate firstly, and the initial hole diameter is expanded properly, thereby being beneficial to the assembly of the liner; although the composite hole extrusion has great advantages in maintaining the shape of the hole member and improving the reinforcing effect, the processing technology is complex, and besides the bushing is directly extruded after the bushing and the hole member are assembled in advance, technicians also increase the extrusion of the unthreaded hole core rod before the bushing and the hole wall are assembled, so that the resource consumption is higher and the processing efficiency is lower.
Disclosure of Invention
The purpose of the present disclosure is to provide a hole extrusion multiple strengthening device and method, which, for a perforated member requiring a press-fit bush to meet the assembly requirement, can greatly improve the processing efficiency and further improve the strengthening effect by performing a one-time continuous extrusion treatment on the hole wall and the bush to be treated for the hole extrusion strengthening of the perforated member by improving the structure of the mandrel and preparing a multi-extrusion integrated mandrel.
The first purpose of the present disclosure is to provide a multiple strengthening device for hole extrusion, which adopts the following technical scheme:
including coaxial arrangement, first plug and the second plug of tip butt joint, first plug is equipped with guide section, first reducing section and first cooperation section along the axial in proper order, and the second plug is equipped with second cooperation section and second reducing section along the axial in proper order, and first cooperation section equals and the butt joint with second cooperation section diameter forms the cylindric cover that is used for cooperating the bush and establishes the portion, and the diameter of the big diameter end of first reducing section and second reducing section all is greater than the diameter of the portion of establishing of cover.
Further, the guide section is a cylindrical structure, the end part of the guide section is butted with the small-diameter end of the first reducing section, and the diameter of the guide section is smaller than that of the large-diameter end of the first reducing section.
Further, along guide section to first cooperation section direction, the diameter of first reducing section increases gradually, forms round platform shape structure, and the minor diameter end diameter of first reducing section is equal to or less than guide section diameter.
Further, be connected with the changeover portion between first reducing section and the first cooperation section, the changeover portion is the cylindric structure that the diameter equals with first reducing section major diameter end.
Furthermore, one end of the transition section is in butt joint with the large-diameter end of the first variable-diameter section, the other end of the transition section is in butt joint with the first matching section, and a shaft shoulder is formed at the butt joint position of the transition section and the first matching section.
Furthermore, the end, away from the guide section, of the first matching section is in butt joint with the end, away from the second reducer section, of the second matching section through the connecting piece, and the end face of the first matching section is attached to the end face of the second matching section and the outer circumferential face of the first matching section is flush with the end face of the second matching section.
Further, the diameter of the second reducing section is gradually increased along the direction far away from the second matching section to form a circular truncated cone-shaped structure, and the diameter of the small diameter end of the second reducing section is equal to or smaller than the diameter of the sleeving part.
A second object of the present disclosure is to provide a hole-extrusion multi-reinforcement method using the hole-extrusion multi-reinforcement apparatus as described above, comprising the steps of:
the first core rod and the second core rod are disassembled, the bushing is sleeved on the first matching section or the second matching section, and the first core rod and the second core rod are butted to enable the bushing to be sleeved and restrained on the outer ring of the sleeving part;
performing first extrusion strengthening on the wall of the hole to be processed by using a first mandrel, and enabling the first mandrel to penetrate through the hole to be processed;
feeding along the axial direction, pushing the bush into the hole subjected to first extrusion strengthening and matching;
performing second extrusion strengthening on the bushing by using a second core rod, and enabling the second core rod to penetrate through the bushing;
and after the extrusion strengthening is finished, the first core rod and the second core rod are withdrawn.
Further, the first core rod, the second core rod, the bushing and the hole wall of the hole to be processed before extrusion strengthening are coated with lubricating liquid, external load is applied to the core rod, and the core rod is driven to sequentially penetrate through the hole to be processed and the bushing.
Furthermore, the bushing and the core rod sleeving part are in clearance fit, and interference fit is formed between the hole wall and the bushing after the first extrusion strengthening.
Compared with the prior art, the utility model has the advantages and positive effects that:
(1) the method aims at the porous member needing to be provided with the pressing bush to meet the assembly requirement, and the hole wall and the bush which need to be processed for extruding and strengthening the hole of the porous member are processed by one-time continuous extrusion through improving the structure of the mandrel and preparing the multi-time extrusion integrated mandrel, so that the processing efficiency can be greatly improved, and the strengthening effect can be further improved;
(2) the diameter of the first matching section at the rear end of the first core rod is matched with the diameter of the bushing, so that the continuity of the deformation of the hole wall of the porous member can be maintained, the sudden change of the plastic deformation is avoided, and the hole expanding effect of the first core rod at the front section of the integrated core rod is reasonably utilized to enable the bushing to be in interference fit with the hole wall more stably; in the machining process, the fitting of the bushing and the hole wall is realized by virtue of the reaming effect of the front end of the core rod, and the strengthening effect is further improved;
(3) in the processing process, the first mandrel firstly enters the hole and is extruded; in the process that the first core rod penetrates through the hole, the lining sleeve assembled at the rear part of the first core rod is tightly attached to the hole wall under the reaming effect of the first core rod; after the bushing is completely attached to the hole wall, the second core rod continuously penetrates through the bushing to complete the extrusion treatment of the bushing; in the machining process, only the core rod is required to complete the strengthening treatment of the member with the hole in one continuous extrusion process, so that the machining efficiency is improved;
(4) the problem that traditional extrusion strengthening process unthreaded hole extrusion and bush assembly if go on to exist step by step is solved, when going on simultaneously through unthreaded hole extrusion and bush assembly, the elastic deformation volume and the plastic deformation volume sum of unthreaded hole inner wall reach the degree that can hold bush surface size alright, make full use of unthreaded hole extrusion cause the unthreaded hole inner wall elastic deformation volume before replying the assembly purpose of bush is realized, be particularly useful for bush and unthreaded hole have the compound hole extrusion processing of great magnitude of interference to handle.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
FIG. 1 is a schematic structural view of an apertured member according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic illustration of a first mandrel, according to one or more embodiments of the present disclosure;
FIG. 3 is a schematic illustration of a second mandrel, according to one or more embodiments of the present disclosure;
FIG. 4 is a schematic view of the overall structure of the first mandrel and the second mandrel after being engaged in one or more embodiments of the present disclosure;
FIG. 5 is a schematic illustration of a mandrel after it has engaged a liner in accordance with one or more embodiments of the present disclosure.
In the figure, 1, a guide section, 2, a transition section, 3, a first matching section, 4, a bolt hole, 5, a second reducing section, 6, a second matching section, 7, a screw rod, 8, a first reducing section, 9, a lining, 10 and a hole to be processed.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this disclosure, if any, merely indicate that the directions of movement are consistent with those of the figures themselves, and are not limiting in structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present disclosure.
As described in the background art, in the prior art, although the extrusion of the composite hole has great advantages in maintaining the shape of the hole member and improving the reinforcing effect, the processing technology is complicated, and the extrusion of the core rod of the unthreaded hole before the assembly of the bush and the hole wall is increased, which results in higher resource consumption and lower processing efficiency; in order to solve the above problems, the present disclosure provides a hole extrusion multiple strengthening device and method.
Example 1
In an exemplary embodiment of the present disclosure, a hole extrusion multiple reinforcement device is provided, as shown in fig. 1-5.
The method mainly comprises the following steps that the core rods comprise a first core rod and a second core rod, and the first core rod at the front end and the second core rod at the rear end are determined according to the sequence of the core rods passing through the hole 10 to be processed;
the first core rod functions to press the unthreaded hole of the holed member, and the second core rod functions to press the bushing.
The first core rod and the second core rod are provided with respective working ends, and the diameters of the working ends determine the magnitude of interference of extrusion treatment of the unthreaded holes or the bushings.
The butt joint of the first core rod and the second core rod is the middle position of the whole core rod, the butt joint is a columnar area with a constant diameter, and the middle position of the core rod is used for assembling the press-fit lining in the subsequent machining process.
The end parts of the first core rod and the second core rod are in threaded fit to realize coaxial butt joint.
Specifically, first plug is equipped with guide section 1, first reducing section 8 and first cooperation section 3 along the axial in proper order, and the second plug is equipped with second cooperation section 6 and second reducing section 5 along the axial in proper order, and first cooperation section equals and the butt joint with second cooperation section diameter and forms the cylindric cover that is used for cooperating bush 9 and establishes the portion, and the diameter of the big diameter end of first reducing section and second reducing section all is greater than the diameter that the portion was established to the cover.
For the matching of the bush with the first core rod and the second core rod, assembling the bush to the tail end of the first core rod, and then combining the head end of the second core rod with the first core rod and the bush through bolt connection;
in this embodiment, the first mandrel has a bolt hole 4 at the end, and the second mandrel has a screw 7 at the head end, the screw is engaged with the bolt hole.
It should be noted that the inner wall of the bushing needs to be coated with semi-solid lubricant, and the contact and friction between the bushing and the mandrel during the subsequent processing should have less influence on the bushing coming out from the middle position of the mandrel.
In addition, the mandrel configuration hole extrusion processing system is driven, and the to-be-processed perforated member, the bush and the integrated mandrel are combined into a hole extrusion processing state;
the guide section of the first core rod with the assembled bushing is placed above the perforated member, and the loaded part of the core rod is connected to the force application device.
It is pointed out that the loaded part of the core rod has no special requirements;
if the loaded part is at the rear end of the rear section of the core rod, the core rod needs to bear extrusion external load, namely the core rod passes through the hole and the lining under the action of extrusion force; if the load-bearing portion is at the tip of the front end of the mandrel bar, the mandrel bar needs to bear a pulling external load, that is, the mandrel bar passes through the hole and the bush by the pulling force.
Specifically, the positional relationship of the specific structure of each part of the mandrel is described in detail as follows:
for the guide section and the first reducing section, the guide section is of a cylindrical structure, the end part of the guide section is butted with the small-diameter end of the first reducing section, and the diameter of the guide section is smaller than that of the large-diameter end of the first reducing section;
along guide section to first cooperation section direction, the diameter of first reducing section increases gradually, forms round platform shape structure, and the minor diameter end diameter of first reducing section is equal to or less than the guide section diameter.
A transition section 2 is connected between the first reducing section and the first matching section, and the transition section is of a cylindrical structure with the diameter equal to the large-diameter end of the first reducing section;
one end of the transition section is butted with the large-diameter end of the first reducing section, and the other end of the transition section is butted with the first matching section to form a shaft shoulder at the butted position.
One end of the first matching section, which is far away from the guide section, is butted with one end of the second matching section, which is far away from the second reducing section, through a connecting piece, and the end surface of the first matching section is attached to the end surface of the second matching section, and the outer circumferential surface of the first matching section is flush with the outer circumferential surface of the second matching section;
for the configuration of the second reducing section, the diameter of the second reducing section is gradually increased along the direction far away from the second matching section to form a circular truncated cone-shaped structure, and the diameter of the small diameter end of the second reducing section is equal to or smaller than the diameter of the sleeving part;
it can be understood that after the sleeve part is matched with the shaft sleeve, the diameter of the outer circumferential surface of the bushing is close to the diameter of the transition section and is slightly larger than the diameter of the transition section, the bushing is pushed to enter a hole after hole expansion and strengthening under the pushing action of the core rod, and the bushing and the hole form interference fit.
Applying external load to the core rod, and sequentially passing through the hole and the lining by the core rod under the action of the external load;
in order to avoid damaging the surface states of the hole wall and the inner wall of the bushing, the working ends of the first core rod and the second core rod are coated with enough lubricating liquid before the core rod passes through the hole and the bushing;
after the step is finished, the lining is assembled in the hole, and the hole wall of the porous member and the lining are subjected to extrusion treatment with certain strength; the bushing extruding process of the holed member is finally completed.
The method aims at the porous member needing to be provided with the pressing bush to meet the assembly requirement, and the hole wall and the bush which need to be processed for extruding and strengthening the hole of the porous member are processed by one-time continuous extrusion through improving the structure of the mandrel and preparing the mode of extruding the integrated mandrel for multiple times, so that the processing efficiency can be greatly improved, and the strengthening effect can be further improved.
Example 2
In another exemplary embodiment of the present disclosure, as shown in fig. 1 to 5, a hole-extrusion multi-reinforcement method is provided, which uses the hole-extrusion multi-reinforcement apparatus as described in example 1.
The method comprises the following steps:
the first core rod and the second core rod are disassembled, the bushing is sleeved on the first matching section or the second matching section, and the first core rod and the second core rod are butted to enable the bushing to be sleeved and restrained on the outer ring of the sleeving part;
coating lubricating liquid on the first core rod, the second core rod, the bushing and the wall of the hole to be processed before extrusion strengthening, applying external load on the core rods, and driving the core rods to sequentially penetrate through the hole to be processed and the bushing;
performing first extrusion strengthening on the wall of the hole to be processed by using a first mandrel, and enabling the first mandrel to penetrate through the hole to be processed;
feeding along the axial direction, pushing the bush into the hole subjected to first extrusion strengthening and matching;
the bushing and the core rod sleeving part are in clearance fit, and the hole wall and the bushing form interference fit after first extrusion strengthening;
performing second extrusion strengthening on the bushing by using a second core rod, and enabling the second core rod to penetrate through the bushing;
and after the extrusion strengthening is finished, the first core rod and the second core rod are withdrawn.
The diameter of the first matching section at the rear end of the first core rod is matched with the diameter of the bushing, so that the continuity of the deformation of the hole wall of the porous member can be maintained, the sudden change of the plastic deformation is avoided, and the hole expanding effect of the first core rod at the front section of the integrated core rod is reasonably utilized to enable the bushing to be in interference fit with the hole wall more stably;
in the machining process, the lining is attached to the hole wall by virtue of the reaming effect of the front end of the core rod, and the strengthening effect is further improved.
In the processing process, the first mandrel firstly enters the hole and is extruded; in the process that the first core rod penetrates through the hole, the lining sleeve assembled at the rear part of the first core rod is tightly attached to the hole wall under the reaming effect of the first core rod;
after the bushing is completely attached to the hole wall, the second core rod continuously penetrates through the bushing to complete the extrusion treatment of the bushing; in the machining process, only the core rod is required to complete the strengthening treatment of the member with the hole in one continuous extrusion process, and the machining efficiency is improved.
It should be noted that the multiple reinforcement apparatus of embodiment 1, in combination with the above processing method, can overcome the technical problems that the integrated multiple reinforcement mandrel bar is not adopted;
for a general fractional compound extrusion process without preparing an integrated core rod, after primary extrusion, the unthreaded hole of the unthreaded hole part needs to reach the deformation amount which meets the requirement that the outer diameter of the bushing part can be assembled in a clearance way;
when the integrated core rod is prepared, the bushing can be easily placed in the unthreaded hole while the unthreaded hole is extruded, namely before the elastic deformation is not macroscopically recovered.
That is, if the extrusion of the unthreaded hole and the assembly of the bush are carried out step by step, the plastic deformation of the inner wall of the unthreaded hole caused by the extrusion of the unthreaded hole needs to reach the degree of accommodating the size of the outer surface of the bush; when the extrusion of the unthreaded hole and the assembly of the bush are carried out simultaneously, the sum of the elastic deformation and the plastic deformation of the inner wall of the unthreaded hole reaches the degree of accommodating the size of the outer surface of the bush.
Through the scheme, the assembling purpose of the bushing is realized by fully utilizing the elastic deformation amount before the elastic deformation recovery of the inner wall of the unthreaded hole caused by the extrusion of the unthreaded hole, and the bushing is particularly suitable for the working occasions where the diameter of the outer surface of the bushing is larger than that of the unthreaded hole, namely the extrusion processing treatment of the composite hole with the bushing and the unthreaded hole having larger interference magnitude.
Example 3
In another embodiment of the present disclosure, a multi-reinforcement method for hole extrusion is provided by taking a laminated bushing reinforced 2024 aluminum alloy perforated tab as an example.
The method comprises the following steps:
the liner material was 300M steel and the mandrel material was W18Gr4VCo5 tool steel. As shown in FIG. 1, the apertured member is a tab element having an aperture of 40 mm. The used bushing has an outer diameter of 40.4mm and an inner diameter of 34 mm. The interference of the extrusion of the unthreaded hole of the perforated member is required to be 2.5 percent, and the interference of the extrusion of the bush is required to be 1.5 percent.
1. Preparing and processing an integrated core rod;
as shown in fig. 2 and 3, this step requires the core rod to be divided into two sections, the front end (fig. 2) and the rear end (fig. 3) being determined in the order of passage through the hole. The middle position of the core rod is a columnar area with a constant diameter, and the middle position of the core rod is used for assembling the press-fit bush in the subsequent processing process. The two sections of the integrated core rod are connected through bolts.
As shown in fig. 2, the front section of the integrated mandrel is a leading end, which is a position to enter the hole to be processed first. The diameter of the working end of the front section of the integrated core rod is 41mm, and the requirement of 2.5% of the extrusion interference of the unthreaded hole is met. In order to assemble the bush, the diameter of the middle part of the integrated core rod is 40.3mm, namely the bush and the core rod are in clearance fit at the assembling position. The diameter of the rear end of the front section of the integrated core rod is equal to the diameter of the bushing, so that the continuity of deformation of the hole wall of the porous member can be maintained, the sudden change of plastic deformation is avoided, and the bushing and the hole wall are in interference fit relatively stably by reasonably utilizing the reaming effect of the front section of the integrated core rod.
As shown in FIG. 3, the diameter of the working end of the rear section of the integrated core rod is 34.51mm, and the requirement of 1.5% of the extrusion interference of the bush is met. In order to assemble the bush, the diameter of the middle part of the integrated core rod is 40.3mm, namely the bush and the core rod are in clearance fit at the assembling position.
2. Assembling a bushing and an integrated core rod;
as shown in fig. 5, the inner wall of the bushing is coated with semi-solid lubricant, the bushing is assembled to the front section of the integrated mandrel, and then the rear section of the integrated mandrel is combined with the front section of the mandrel and the bushing by bolt connection.
3. Building a hole extrusion processing system;
this step requires combining the apertured member to be treated with the bushing and integral mandrel in an aperture extrusion processing state. The inlet of the front end of the integrated core rod with the assembled lining is placed above the perforated member, and the loaded part of the integrated core rod is connected to the force application device.
The loading part is arranged at the rear end of the rear section of the integrated core rod, and the core rod needs to bear extrusion external load, namely the core rod passes through the hole and the lining under the action of extrusion force.
4. And carrying out hole extrusion strengthening treatment.
After lubricating liquid is coated on the parts of the front section and the rear section of the core rod, which are in contact with the hole wall and the inner wall of the bush, an external load is applied to the core rod, and the core rod sequentially penetrates through the hole and the bush under the action of the external load.
After this step is completed, the bushing is assembled in the hole, and the hole wall of the perforated member and the bushing are both subjected to an extrusion process of a certain strength. The bushing extruding process of the holed member is finally completed.
Example 4
In another embodiment of the present disclosure, a multi-reinforcement method for hole extrusion is provided by taking a press-fit bushing to reinforce a 2024 aluminum alloy perforated tab as an example.
The method comprises the following steps:
the lining material is PH13-8Mo stainless steel, and the core rod material is W18Gr4VCo5 tool steel. The perforated member is a lug part, and the inner diameter of the hole is 40 mm. The used bushing has an outer diameter of 40.4mm and an inner diameter of 34 mm. The interference of the extrusion of the unthreaded hole of the perforated member is required to be 3 percent, and the interference of the extrusion of the bush is required to be 2 percent.
1. Preparing and processing an integrated core rod;
the diameter of the working end of the front section of the integrated core rod is 41.2mm, and the requirement of 3% of extrusion interference of the unthreaded hole is met. In order to assemble the bush, the diameter of the middle part of the integrated core rod is 40.3mm, namely the bush and the core rod are in clearance fit at the assembling position. The diameter of the rear end of the front section of the integrated core rod is equal to the diameter of the bushing.
The diameter of the working end of the rear section of the integrated core rod is 34.68mm, and the requirement of 2% of extrusion interference of the bushing is met. The diameter of the middle part of the integrated core rod is 40.3mm, namely the bush and the core rod are in clearance fit at the assembly position.
2. Assembling a bushing and an integrated core rod;
the inner wall of the bushing needs to be coated with semisolid lubricating oil, the bushing is assembled to the front section of the integrated core rod, and then the rear section of the integrated core rod is connected with the front section of the core rod and the bushing through bolts.
3. Building a hole extrusion processing system;
the perforated member to be treated, the bush and the integrated mandrel are combined into a hole extrusion processing state. The inlet of the front end of the integrated core rod with the assembled lining is placed above the perforated member, and the loaded part of the integrated core rod is connected to the force application device.
The loading part is at the front end of the front section of the integrated mandrel, and the mandrel needs to bear pulling external load, namely the mandrel passes through the hole and the lining under the action of pulling force.
4. And carrying out hole extrusion strengthening treatment.
After lubricating liquid is coated on the parts of the front section and the rear section of the core rod, which are in contact with the hole wall and the inner wall of the bush, an external load is applied to the core rod, and the core rod sequentially penetrates through the hole and the bush under the action of the external load.
After this step is completed, the bushing is assembled in the hole, and the hole wall of the perforated member and the bushing are both subjected to an extrusion process of a certain strength. The bushing extruding process of the holed member is finally completed.
Example 5
In another embodiment of the present disclosure, taking the 7050 aluminum alloy perforated tab as an example of extrusion strengthening of the pressed bushing, another method of multiple hole extrusion strengthening is given.
The material of the lining is 300M steel, and the material of the core rod is W6Mo5Cr4V3 tool steel. The perforated member is a lug part, and the inner diameter of the hole is 30 mm. The used bushing has an outer diameter of 30.4mm and an inner diameter of 26 mm. The interference of the extrusion of the unthreaded hole of the perforated member is required to be 3 percent, and the interference of the extrusion of the bush is required to be 2 percent.
1. Preparing and processing an integrated core rod;
the diameter of the working end of the front section of the integrated core rod is 30.9mm, and the requirement of 3% of extrusion interference of the unthreaded hole is met. In order to assemble the bush, the diameter of the middle part of the integrated core rod is 30.4mm, namely the bush and the core rod are in clearance fit at the assembling position. The diameter of the rear end of the front section of the integrated core rod is equal to the diameter of the bushing.
The diameter of the working end of the rear section of the integrated core rod is 26.52mm, and the requirement of 2% of extrusion interference of the bushing is met. The diameter of the middle part of the integrated core rod is 30.4mm, namely the bush and the core rod assembly position are in clearance fit.
2. Assembling a bushing and an integrated core rod;
the inner wall of the bushing needs to be coated with semisolid lubricating oil, the bushing is assembled to the front section of the integrated core rod, and then the rear section of the integrated core rod is connected with the front section of the core rod and the bushing through bolts.
3. Building a hole extrusion processing system;
the perforated member to be treated, the bush and the integrated mandrel are combined into a hole extrusion processing state. The inlet of the front end of the integrated core rod with the assembled lining is placed above the perforated member, and the loaded part of the integrated core rod is connected to the force application device.
The loading part is at the front end of the front section of the integrated mandrel, and the mandrel needs to bear pulling external load, namely the mandrel passes through the hole and the lining under the action of pulling force.
4. And carrying out hole extrusion strengthening treatment.
After lubricating liquid is coated on the parts of the front section and the rear section of the core rod, which are in contact with the hole wall and the inner wall of the bush, an external load is applied to the core rod, and the core rod sequentially penetrates through the hole and the bush under the action of the external load.
After this step is completed, the bushing is assembled in the hole, and the hole wall of the perforated member and the bushing are both subjected to an extrusion process of a certain strength. The bushing extruding process of the holed member is finally completed.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (8)
1. A hole extrusion multi-strengthening device is characterized by comprising a first core rod and a second core rod which are coaxially arranged and end parts of which are butted, wherein the first core rod is sequentially provided with a guide section, a first reducing section and a first matching section along the axial direction, the second core rod is sequentially provided with a second matching section and a second reducing section along the axial direction, the diameters of the first matching section and the second matching section are equal, the first matching section and the second matching section are butted to form a cylindrical sleeve part used for matching a bushing, and the diameters of large-diameter ends of the first reducing section and the second reducing section are larger than the diameter of the sleeve part;
a transition section is connected between the first reducing section and the first matching section, and the transition section is of a cylindrical structure with the diameter equal to the large-diameter end of the first reducing section;
one end of the transition section is in butt joint with the large-diameter end of the first reducing section, and the other end of the transition section is in butt joint with the first matching section and forms a shaft shoulder at the butt joint position of the first matching section.
2. The hole extrusion multi-reinforcement apparatus of claim 1, wherein the guide section is a cylindrical structure having an end abutting the small diameter end of the first reducer section, and a diameter of the guide section is smaller than a diameter of the large diameter end of the first reducer section.
3. The hole extrusion multi-reinforcement apparatus of claim 2, wherein the diameter of the first reducer section is gradually increased in a direction from the guide section to the first fitting section to form a circular truncated cone structure, and the diameter of the small diameter end of the first reducer section is equal to or smaller than the diameter of the guide section.
4. The hole extrusion multiple strengthening device of claim 1, wherein an end of the first fitting section remote from the guide section is butted against an end of the second fitting section remote from the second reducer section by a connector, and an end surface of the first fitting section is flush with an end surface and an outer circumferential surface of the second fitting section.
5. The hole extrusion multi-reinforcement apparatus of claim 1, wherein the second variable diameter section has a diameter that gradually increases in a direction away from the second fitting section to form a circular truncated cone structure, and a small diameter end of the second variable diameter section has a diameter equal to or smaller than a diameter of the sleeve portion.
6. A hole-extrusion multi-reinforcement method using the hole-extrusion multi-reinforcement apparatus according to any one of claims 1 to 5, comprising the steps of:
the first core rod and the second core rod are disassembled, the bushing is sleeved on the first matching section or the second matching section, and the first core rod and the second core rod are butted to enable the bushing to be sleeved and restrained on the outer ring of the sleeving part;
performing first extrusion strengthening on the wall of the hole to be processed by using a first mandrel, and enabling the first mandrel to penetrate through the hole to be processed; feeding along the axial direction, pushing the bush into the hole subjected to first extrusion strengthening and matching;
performing second extrusion strengthening on the bushing by using a second core rod, and enabling the second core rod to penetrate through the bushing;
and after the extrusion strengthening is finished, the first core rod and the second core rod are withdrawn.
7. The hole-extrusion multi-reinforcement method according to claim 6, wherein the first mandrel, the second mandrel, the bushing, and the wall of the hole to be treated before extrusion reinforcement are coated with a lubricating liquid, and the mandrel is externally loaded to drive the mandrel to pass through the hole to be treated and the bushing in this order.
8. The hole extrusion multi-reinforcement method of claim 6, wherein the bushing is in clearance fit with the mandrel engaging portion, and wherein the first extrusion reinforcement provides an interference fit between the hole wall and the bushing.
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| CN202011155166.2A CN112359189B (en) | 2020-10-26 | 2020-10-26 | Hole extrusion multiple strengthening device and method |
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| CN202011155166.2A CN112359189B (en) | 2020-10-26 | 2020-10-26 | Hole extrusion multiple strengthening device and method |
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| CN112359189B true CN112359189B (en) | 2021-09-28 |
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