CN115138798B - Method and device for reinforcing connecting hole - Google Patents
Method and device for reinforcing connecting hole Download PDFInfo
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- CN115138798B CN115138798B CN202210793819.2A CN202210793819A CN115138798B CN 115138798 B CN115138798 B CN 115138798B CN 202210793819 A CN202210793819 A CN 202210793819A CN 115138798 B CN115138798 B CN 115138798B
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- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 32
- 230000001050 lubricating effect Effects 0.000 claims abstract description 29
- 238000005728 strengthening Methods 0.000 claims description 27
- 230000002787 reinforcement Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 description 28
- 230000008569 process Effects 0.000 description 10
- 230000008093 supporting effect Effects 0.000 description 7
- 230000000977 initiatory effect Effects 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 6
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 5
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000000994 depressogenic effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J3/00—Lubricating during forging or pressing
Abstract
The invention relates to a method and a device for reinforcing a connecting hole. The reinforcing method of the connecting hole comprises the steps of S1, selecting a reinforcing device with a preset size, wherein the diameter of a partial area along the circumferential direction of the working section of the reinforcing device is not smaller than the aperture of the connecting hole, and the diameter of the partial area is smaller than the aperture; s2, extending the working section into the connecting hole, and enabling the working section to spirally advance around the axial direction of the connecting hole in the connecting hole. The reinforcing device comprises a working section, the working section is used for extending into the connecting hole and spirally advancing around the axial direction of the connecting hole, the working section comprises a butt part and a concave part, the butt part is located in a partial area of the working section along the circumferential direction of the working section, the concave part is located in another partial area of the working section along the circumferential direction of the working section, the butt part is used for propping against the hole wall of the connecting hole, and a gap for containing lubricating powder is formed between the concave part and the hole wall.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a method and a device for strengthening a connecting hole.
Background
And the connecting holes are formed in the parts, so that the parts can be conveniently installed. The fatigue life of the connecting hole can be effectively prolonged by axially extruding the connecting hole. In the extrusion strengthening process of the hole, a mandrel is often used for extrusion. The existing core rod is shown in fig. 1, and comprises a guide section 1, a working section 2 and an exit section 3, when in extrusion, lubricating powder is smeared on the wall of the connecting hole, the guide section 1, the working section 2 and the exit section 3 of the core rod are extruded into the connecting hole in sequence, and as the guide section 1 has a certain taper, the radial force born by the wall of the hole is far greater than the axial force, and the wall of the hole is elastically deformed and plastically deformed along the radial direction of the connecting hole, so that the connecting hole is reinforced.
However, when the existing core rod is used for extrusion, the lubricating powder does not have a flowing space and can only be stored in a groove generated in the hole processing process, and the roughness of the hole wall after extrusion is not improved. Meanwhile, when the existing core rod is used for extrusion, if the surface of the core rod is worn, axial scratches can be left on the hole wall. When fatigue fracture occurs to the hole part, the crack propagation direction is mainly axial, so that axial scratches are very easy to become crack sources under dynamic working conditions, and the fatigue life of the part is influenced.
Disclosure of Invention
Based on the above, it is necessary to provide a method for reinforcing the connecting hole, aiming at the problems that the lubricating powder is stored in the groove during extrusion and the axial scratch is generated on the wall of the hole after extrusion.
A method for strengthening a connecting hole comprises the following steps:
s1, selecting a strengthening device with a preset size, wherein the diameter of a partial area along the circumferential direction of the working section of the strengthening device is not smaller than the aperture of the connecting hole, and the diameter of the partial area is smaller than the aperture;
s2, extending the working section into the connecting hole, and enabling the working section to spirally advance around the axial direction of the connecting hole in the connecting hole.
In one embodiment, the working segment is required to satisfy the following formula during the spin extrusion process:
wherein h is 2 And v is the axial moving speed of the working section along the connecting hole, n is the circumferential rotating speed of the working section, and k is the number of turns of the working section which are required to be rotated for finishing strengthening.
The invention also provides a strengthening device for strengthening the connecting hole, which comprises:
the working section is used for extending into the connecting hole and spirally advancing around the axial direction of the connecting hole, the working section comprises an abutting part and a concave part, the abutting part is located in a partial area of the working section along the circumferential direction of the working section, the concave part is located in another partial area of the working section along the circumferential direction of the working section, the abutting part is used for abutting against the hole wall of the connecting hole, and a gap for containing lubricating powder is formed between the concave part and the hole wall.
In one embodiment, the working section comprises a body, the side wall of the body comprises a first area and a second area which are circumferentially distributed along the body, the abutting part protrudes outwards at the first area, and the concave part is formed at the second area.
In one embodiment, a plurality of the abutting portions are arranged at intervals along the circumferential direction of the body.
In one embodiment, the working section comprises a body, the side wall of the body comprises a first area and a second area which are circumferentially distributed along the body, the second area is recessed inwards to form the recessed portion, and the first area forms the abutting portion.
In one embodiment, the outer circumferential surface of the abutting portion is in a cambered surface shape.
In one embodiment, a guide portion is provided at one end of the abutment portion in the axial direction, the guide portion extends in the axial direction, and a radial dimension of one end of the guide portion connected to the abutment portion is greater than a radial dimension of one end of the guide portion facing away from the abutment portion.
In one embodiment, an end of the abutting portion along the axial direction is provided with a withdrawing portion, the withdrawing portion extends along the axial direction, and a radial dimension of an end of the withdrawing portion connected to the abutting portion is larger than a radial dimension of an end of the withdrawing portion away from the abutting portion.
In one embodiment, the radial dimension of the end of the guide portion connected to the abutting portion, the radial dimension of the end of the exit portion connected to the abutting portion, and the end face diameter of the abutting portion are equal.
According to the strengthening method of the connecting hole, the strengthening device with the preset size is selected, so that the diameter of a part of the area on the working section of the strengthening device along the circumferential direction of the strengthening device is not smaller than the aperture of the connecting hole, and the diameter of the part of the area is smaller than the aperture; the working section stretches into the connecting hole, and the working section spirally advances around the axial direction of the connecting hole in the connecting hole, so that part of the working part is abutted against the hole wall of the connecting hole to strengthen the connecting hole, and a gap is formed between part of the working section and the hole wall, so that lubricating powder is contained. When the working section spirally advances around the axial direction of the connecting hole in the connecting hole, the scratch direction of the hole wall is not axial any more, but is changed into a spiral line type, so that the probability of crack initiation at the scratch position is reduced, and the fatigue life of the part is prolonged. Simultaneously, lubrication powder slides around the circumference of connecting hole in the clearance, no longer seals in the recess when hole processing, and the spiral of working segment advances and can play the effect of finishing, and the roughness of extrusion back pore wall reduces by a wide margin, improves the fatigue life of part.
Above-mentioned reinforcing apparatus, the operating section includes butt portion and depressed part, stretches into the connecting hole with the operating section in, forms between depressed part and the pore wall and holds lubricated powder clearance, contact between butt portion and the pore wall, rotatory operating section to drive butt portion and rotate, make butt portion rotatory extrusion pore wall, strengthen the connecting hole. And a gap is reserved between the concave part and the hole wall, namely, a region where the working section and the hole wall are not contacted in one rotation process, not only can contain lubricating dust, but also can provide a certain rebound interval for the hole wall, thereby playing the role of multiple extrusion and further strengthening the connecting hole. According to the rotary extrusion core rod provided by the invention, the abutting part and the hole wall form a gap to contain lubricating dust, the abutting part can drive the lubricating powder to flow along the circumferential direction in the rotating process of the working section, so that the lubricating powder is prevented from being sealed in a groove produced by hole processing, the roughness of the hole wall is reduced, meanwhile, the scratch direction is changed into a spiral line from the axial direction, the probability of crack initiation at the scratch position is reduced, and the fatigue life of a part is prolonged.
Drawings
FIG. 1 is a schematic view of a prior art mandrel;
FIG. 2 is a schematic view of a first view angle structure of a reinforcing apparatus according to a first embodiment of the present invention;
FIG. 3 is a schematic view of a second view angle structure of the reinforcing apparatus according to the first embodiment of the present invention;
FIG. 4 is a schematic view of a third view angle structure of the reinforcing apparatus according to the first embodiment of the present invention;
FIG. 5 is a schematic view of a structure of a hole wall reinforced by an abutting portion of a reinforcing apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a working section of a reinforcing apparatus according to a second embodiment of the present invention.
In the figure:
in fig. 1:
in fig. 2 to 6:
100. a working section; 110. a body; 111. an abutting portion; 112. a recessed portion; 113. a support part; 114. a mounting part;
200. a guide part;
300. an exit section;
400. a hole wall.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
The existing core rod is shown in fig. 1, and comprises a guide section 1, a working section 2 and an exit section 3, when in extrusion, lubricating powder is smeared on the wall of a connecting hole, the guide section 1, the working section 2 and the exit section 3 of the core rod are sequentially extruded into the connecting hole along the axial direction of the connecting hole, and as the guide section 1 has a certain taper, the radial force born by the wall of the hole is far greater than the axial force, and the wall of the hole is elastically deformed and plastically deformed along the radial direction of the connecting hole, so that the connecting hole is reinforced. However, when the existing core rod is used for extrusion, scratches distributed along the axial direction of the connecting hole are left on the hole wall after extrusion, and the roughness of the hole wall of the connecting hole is increased.
Roughness characterizes the microscopic geometry of the surface of the part, which is characterized by continuously adjacent notches, based on which the learner proposes a semi-empirical formula of roughness and stress concentration coefficient under tensile load:
wherein k is t Is the stress concentration coefficient; λ is the ratio of gap spacing to depth, however, the λ value that is difficult to measure on an actual machined surface, for a machined surface, is generally considered λ=1; r is R z Is the maximum height of the contour, which is an important roughness parameter; ρ is the radius of curvature of the notch bottom.
The stress concentration coefficient has great influence on the fatigue life, and the following formula is adopted:
in the formula delta sigma qev Is the equivalent stress amplitude; r is stress ratio; Δs is the nominal stress amplitude range; n is the number of stress cycles; c i The initial fracture resistance coefficient is a material constant related to tensile properties; (DeltaSigma) qev ) th The onset threshold, expressed in terms of equivalent stress amplitude, is the material constant related to tensile properties and fatigue limit; n is a strain hardening exponent.
In conclusion, according to fracture mechanics, the scratch of the hole wall can cause the increase of roughness, aggravate the phenomenon of stress concentration, increase the equivalent stress amplitude and finally cause the reduction of fatigue life.
Therefore, after the common core rod is used for extrusion, scratches are distributed along the axial direction and are consistent with the fatigue fracture direction of the part, so that the scratches are easy to be fatigue crack initiation positions, and the fatigue life of the part can be prolonged by improving the scratches or changing the direction of the scratches.
And (3) obtaining through measurement results of a white light interferometer and a coarseness meter, wherein if molybdenum disulfide is selected as the lubricating powder, the extruded molybdenum disulfide can be sealed in scratches. In the measurement results of the coarseness gauge, the hole wall roughness was reduced by about 80% compared to before extrusion, before molybdenum disulfide was not rubbed off after extrusion. However, after wiping off the molybdenum disulfide, the roughness data became larger and even worse than before extrusion, indicating that the molybdenum disulfide was encapsulated in the lubricating powder after extrusion.
When the existing core rod is used for extrusion, the lubricating powder is positioned between the core rod and the hole wall, when the core rod moves along the axial direction of the hole wall, as the diameter of the core rod is larger than the diameter of the hole, the lubricating powder has two trends of flowing along the axial direction and the radial direction, the lubricating powder is a powdery lubricant, the axial fluidity is poor, the section of the existing core rod is circular, and no flowing space exists in the circumferential direction of the lubricating powder, so that most of the lubricating powder is extruded into and sealed in scratches along the radial direction.
The embodiment of the invention provides a strengthening device for strengthening a connecting hole, as shown in fig. 2 and 5, the strengthening device comprises a working section 100, the working section 100 is used for extending into the connecting hole and spirally advancing around the axial direction of the connecting hole, the working section 100 comprises an abutting part 111 and a concave part 112, the abutting part 111 is positioned on a part of the working section 100 along the circumferential direction of the working section, the concave part 112 is positioned on another part of the working section 100 along the circumferential direction of the working section, the abutting part 111 is used for abutting against a hole wall 400 of the connecting hole, and a gap for containing lubricating powder can be formed between the concave part 112 and the hole wall 400.
In the reinforcing device, the working section 100 includes the abutting portion 111 and the recess portion 112, the working section 100 is inserted into the connecting hole, a gap for accommodating the lubricating powder is formed between the recess portion 112 and the hole wall 400, the abutting portion 111 contacts the hole wall 400, and the working section 100 is rotated, so that the abutting portion 111 is driven to rotate, the abutting portion 111 is rotated to press the hole wall 400, and the connecting hole is reinforced. And a gap is reserved between the concave part 112 and the hole wall 400, namely, a region where the working section 100 and the hole wall 400 are not contacted in one rotation process, not only can contain lubrication dust, but also can provide a certain rebound interval for the hole wall 400, thereby playing a role in multiple extrusion and further strengthening the connecting hole. According to the rotary extrusion core rod provided by the invention, the abutting part 111 and the hole wall 400 form a gap to contain lubricating dust, the abutting part 111 can drive the lubricating powder to flow around the circumference of the connecting hole on the hole wall 400 and smooth the hole wall in the rotating process of the working section 100, so that the lubricating powder is prevented from being stored in a groove generated by hole processing, the roughness of the hole wall is reduced, in addition, the scratch direction is changed into a spiral line from the axial direction by the spiral advancing of the working section 100, the probability of crack initiation at the scratch position is reduced, and the fatigue life of a part is prolonged.
It should be noted that, during the rotation process of the working section 100, the abutting portion 111 may process a spiral scratch on the hole wall 400, and the direction of the spiral line and the fatigue fracture of the part are inconsistent, so as to reduce the probability of crack initiation, effectively improve the fatigue performance of the bearing hole after extrusion strengthening, and improve the fatigue life of the part.
As shown in fig. 2, 3 and 5, in some embodiments, the working section 100 includes a body 110, and a sidewall of the body 110 includes a first region and a second region arranged along a circumferential direction of the body, where the first region protrudes outward with an abutment 111, and the second region forms a recess 112. In the first area of the body 110, the body 110 protrudes outwards to form an abutting portion 111, and the abutting portion 111 is used for abutting against the hole wall 400 of the connecting hole, so that the connecting hole is reinforced. The second region of the body 110 forms a recess 112, a gap is formed between the recess 112 and the hole wall 400 to accommodate the lubrication powder, when the body 110 advances spirally, the abutting part 111 abuts against the hole wall 400 to strengthen the hole wall 400, and along with the rotation of the body 110, the position of the gap is also changed, the gap rotates along the circumferential direction of the connecting hole, and the lubrication powder in the gap rotates along the circumferential direction of the connecting hole, so that the lubrication powder is extruded and pushed out of the connecting hole. It can be understood that, in the present application, the outer wall of the body 110 protrudes outwards to form the abutment portion 111, and the side wall of the second area of the body 110 is the recess portion 112.
As shown in fig. 2, in some embodiments, the plurality of abutments 111 are spaced apart along the circumferential direction of the body 110. The plurality of abutting portions 111 are provided such that the plurality of abutting portions 111 are arranged at intervals along the circumferential direction of the body 110, thereby increasing the reinforcing efficiency. Between two adjacent abutting portions 111 is a recessed portion 112, which is convenient for accommodating lubricating powder. Specifically, the four abutting portions 111 are provided, the four abutting portions 111 are uniformly arranged along the circumferential direction of the body 110, the body 110 is in a cylindrical structure, and the working section 100 has symmetry. Four abutting parts 111 are arranged, and the strengthening device can ensure that each position on the hole wall 400 is abutted and strengthened by the abutting parts 111 only by rotating 1/4 circle.
In some embodiments, the outer circumferential surface of the abutment 111 is arcuate. The outer peripheral surface of the abutting portion 111 is formed in a cambered surface shape, so that the abutting portion can abut against the hole wall 400 conveniently, and the reinforcing effect of the hole wall 400 is enhanced.
As shown in fig. 2 and 3, in some embodiments, the abutment 111 is provided with a guide portion 200 at one end in the axial direction, the guide portion 200 extending in the axial direction, and a radial dimension of the guide portion 200 connected to the end of the abutment 111 is greater than a radial dimension of the guide portion 200 at an end facing away from the abutment 111. The guide portion 200 is provided to perform a guiding function, and when the radial dimension of the guide portion 200 is gradually increased, and the connecting hole needs to be reinforced, the guide portion 200 is first inserted into the connecting hole along the axial direction of the connecting hole, and as the radial dimension of the guide portion 200 is gradually increased, the outer wall of one end of the guide portion 200 connected to the abutting portion 111 abuts against the hole wall 400, and at this time, the working section 100 is rotated again to spirally advance the abutting portion 111. Specifically, a plurality of guide portions 200 are provided, and the plurality of guide portions 200 and the plurality of abutting portions 111 are in one-to-one correspondence.
As shown in fig. 2 to 4, in some embodiments, an end of the abutting portion 111 in the axial direction is provided with a withdrawing portion 300, the withdrawing portion 300 extends in the axial direction, and a radial dimension of an end of the withdrawing portion 300 connected to the abutting portion 111 is larger than a radial dimension of an end of the withdrawing portion 300 facing away from the abutting portion 111. The exit portion 300 is provided, the radial dimension of one end of the exit portion 300 connected to the abutting portion 111 is larger than the radial dimension of one end of the exit portion 300 away from the abutting portion 111, the radial dimension of the exit portion 300 is gradually reduced, and geometric continuity of the longitudinal section of the reinforcing device is ensured. Specifically, a plurality of withdrawing portions 300 are provided, and the plurality of withdrawing portions 300 and the plurality of abutting portions 111 are in one-to-one correspondence.
In some embodiments, the radial dimension of the guide portion 200 connected to the end of the abutment portion 111, the radial dimension of the exit portion 300 connected to the end of the abutment portion 111, and the end face diameter of the abutment portion 111 are equal. When the guide portion 200 is connected to the abutting portion 111 and the abutting portion 111 are set to have the same end face size, and the reinforcing device is inserted into the connecting hole, the portion where the abutting portion 111 and the guide portion 200 are connected can abut against the hole wall 400, and the reinforcing device is rotated to reinforce the connecting hole. The end surface dimensions of the withdrawing portion 300 connected to the abutting portion 111 and the abutting portion 111 are set to be equal, and a certain supporting effect is provided for the abutting portion 111 so that it can be completely rotated out of the connection hole.
Specifically, the body 110 further includes a supporting portion 113 extending in an axial direction of the connection hole, the supporting portion 113 being disposed between the plurality of guide portions 200 and between the plurality of withdrawing portions 300, the supporting portion 113 supporting the plurality of guide portions 200 and the plurality of withdrawing portions 300.
Specifically, the body 110 further includes a mounting portion 114, where the mounting portion 114 is connected to the supporting portion 113 for supporting the plurality of withdrawing portions 300, and the mounting portion 114 is configured to connect to a machine tool, so that the machine tool drives the strengthening device to integrally rotate.
As shown in fig. 6, in some embodiments, the working section 100 includes a body 110, and a sidewall of the body 110 includes a first region and a second region arranged along a circumferential direction of the body, where the second region is recessed inward to form a recess 112, and the first region forms an abutment 111. The body 110 is in a cylindrical structure, the outer wall of the body 110 is recessed inwards to form a recessed portion 112, a gap for accommodating lubricating powder is formed between the recessed portion 112 and the hole wall 400, and the outer wall of the body 110 forms an abutting portion 111 for abutting against the hole wall 400.
The embodiment of the invention provides a method for reinforcing a connecting hole, which comprises the following steps:
s1, selecting a strengthening device with a preset size, wherein the diameter of a part of the region along the circumferential direction of the working section 100 of the strengthening device is not smaller than the aperture of a connecting hole, and the diameter of the part of the region is smaller than the aperture;
s2, extending the working section 100 into the connecting hole, and enabling the working section 100 to spirally advance around the axial direction of the connecting hole in the connecting hole.
According to the method for reinforcing the connecting hole, the reinforcing device with the preset size is selected, so that the diameter of a partial area along the circumferential direction of the working section 100 of the reinforcing device is not smaller than the aperture of the connecting hole, and the diameter of the partial area is smaller than the aperture; the working section 100 is extended into the connecting hole, and the working section 100 is spirally advanced in the connecting hole around the axial direction of the connecting hole, so that part of the working part is abutted against the hole wall 400 of the connecting hole, the connecting hole is reinforced, and a gap is formed between part of the working section and the hole wall 400, so that lubricating powder is contained. When the working section 100 spirally advances in the connecting hole around the axial direction of the connecting hole, the scratch direction on the hole wall 400 is not axial any more, but is changed into a spiral line type, so that the probability of crack initiation at the scratch position is reduced, and the fatigue life of the part is prolonged. Simultaneously, lubrication powder slides around the circumference of connecting hole in the clearance, no longer seals in the recess when hole processing, and the spiral of working section 100 advances and can play the effect of finishing, and the roughness of pore wall reduces by a wide margin after the extrusion, improves the fatigue life of part.
In some embodiments, the working segment 100 needs to satisfy the following equation during the spin extrusion process:
wherein h is 2 In order to length of the working portion along the axial direction of the connecting hole, v is the moving speed of the working section 100 along the axial direction of the connecting hole, n is the circumferential rotation speed of the working section 100, and k is the number of turns of the working section 100 that need to be rotated to complete reinforcement.
The rad means the unit of the number of turns, and the length h of the working portion along the axial direction of the connecting hole 2 The number of turns k of the working segment 100 that is required to be turned for strengthening can be calculated under the condition that the moving speed v of the working segment 100 along the axial direction of the connecting hole and the circumferential rotation speed n of the working segment 100 are all known, wherein k is an integer.
For example, when four abutting portions 111 are provided, the reinforcing device is required to be rotated only one quarter turn, that is, to press one turn in the circumferential direction of the connecting holeOf course, the strengthening device can rotate by k times of a quarter circle, so that the effect of circumferentially extruding k circles can be achieved, and the extrusion times can be controlled.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. A reinforcing apparatus for reinforcing a connection hole, comprising:
the working section (100) is used for extending into the connecting hole and spirally advancing around the axial direction of the connecting hole, the working section (100) comprises an abutting part (111) and a concave part (112), the abutting part (111) is located in a partial area of the working section (100) along the circumferential direction of the working section, the concave part (112) is located in another partial area of the working section (100) along the circumferential direction of the working section, the abutting part (111) is used for abutting against the hole wall of the connecting hole, a gap for containing lubricating powder is formed between the concave part (112) and the hole wall, and the lubricating powder in the gap rotates along the circumferential direction of the connecting hole so as to extrude and push out the lubricating powder from the connecting hole.
2. The reinforcement device according to claim 1, characterized in that the working section (100) comprises a body (110), the side wall of the body (110) comprising a first zone and a second zone circumferentially arranged along itself, the first zone being outwardly convex with the abutment (111), the second zone forming the recess (112).
3. A strengthening device according to claim 2, wherein a plurality of said abutment portions (111) are arranged at intervals along the circumferential direction of the body.
4. The reinforcement device according to claim 1, wherein the working section (100) comprises a body (110), the side wall of the body (110) comprises a first region and a second region circumferentially arranged along the body, the second region being recessed inwards to form the recess (112), the first region forming the abutment (111).
5. The reinforcement device according to any one of claims 1 to 4, wherein an outer peripheral surface of the abutting portion (111) is in a cambered surface shape.
6. The strengthening device according to any one of claims 1 to 4, wherein one end of the abutment portion (111) in the axial direction is provided with a guide portion (200), the guide portion (200) extending in the axial direction, a radial dimension of one end of the guide portion (200) connected to the abutment portion (111) being larger than a radial dimension of one end of the guide portion (200) facing away from the abutment portion (111).
7. The strengthening device according to claim 6, wherein one end of the abutment portion (111) in the axial direction is provided with a withdrawal portion (300), the withdrawal portion (300) extending in the axial direction, a radial dimension of one end of the withdrawal portion (300) connected to the abutment portion (111) being larger than a radial dimension of one end of the withdrawal portion (300) facing away from the abutment portion (111).
8. The reinforcing apparatus according to claim 7, wherein a radial dimension of the guide portion (200) connected to the one end of the abutting portion (111), a radial dimension of the exit portion (300) connected to the one end of the abutting portion (111), and an end face diameter of the abutting portion are equal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210793819.2A CN115138798B (en) | 2022-07-07 | 2022-07-07 | Method and device for reinforcing connecting hole |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210793819.2A CN115138798B (en) | 2022-07-07 | 2022-07-07 | Method and device for reinforcing connecting hole |
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| Publication Number | Publication Date |
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| CN115138798A CN115138798A (en) | 2022-10-04 |
| CN115138798B true CN115138798B (en) | 2024-02-09 |
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| CN202210793819.2A Active CN115138798B (en) | 2022-07-07 | 2022-07-07 | Method and device for reinforcing connecting hole |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2821000A1 (en) * | 2001-02-20 | 2002-08-23 | Jean Claude Rouiller | BORING INSTRUMENT, PARTICULARLY FOR BORING DENTAL CHANNELS |
| CN111635983A (en) * | 2020-06-12 | 2020-09-08 | 四川大学 | Hole pulling-twisting coupling cold extrusion strengthening core rod and strengthening method thereof |
| CN111961823A (en) * | 2020-08-19 | 2020-11-20 | 江苏大学 | Spiral slotted sleeve with concave-convex phase micro-texture and hole extrusion strengthening method |
-
2022
- 2022-07-07 CN CN202210793819.2A patent/CN115138798B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2821000A1 (en) * | 2001-02-20 | 2002-08-23 | Jean Claude Rouiller | BORING INSTRUMENT, PARTICULARLY FOR BORING DENTAL CHANNELS |
| CN111635983A (en) * | 2020-06-12 | 2020-09-08 | 四川大学 | Hole pulling-twisting coupling cold extrusion strengthening core rod and strengthening method thereof |
| CN111961823A (en) * | 2020-08-19 | 2020-11-20 | 江苏大学 | Spiral slotted sleeve with concave-convex phase micro-texture and hole extrusion strengthening method |
Non-Patent Citations (1)
| Title |
|---|
| 侯帅 ; 朱有利 ; 王燕礼 ; 边飞龙 ; 叶雄林 ; .孔边倒角对直接芯棒孔冷挤压残余应力场的影响.兵器材料科学与工程.(第03期),全文. * |
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| CN115138798A (en) | 2022-10-04 |
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