CN117444539A - Slotting bush forming process and slotting bush - Google Patents
Slotting bush forming process and slotting bush Download PDFInfo
- Publication number
- CN117444539A CN117444539A CN202311466722.1A CN202311466722A CN117444539A CN 117444539 A CN117444539 A CN 117444539A CN 202311466722 A CN202311466722 A CN 202311466722A CN 117444539 A CN117444539 A CN 117444539A
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- metal strip
- rollers
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- support
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000002184 metal Substances 0.000 claims abstract description 60
- 239000000463 material Substances 0.000 claims abstract description 37
- 238000005096 rolling process Methods 0.000 claims abstract description 25
- 238000004804 winding Methods 0.000 claims abstract description 24
- 238000005520 cutting process Methods 0.000 claims abstract description 18
- 230000001050 lubricating effect Effects 0.000 claims abstract description 7
- 238000005461 lubrication Methods 0.000 claims abstract description 5
- 238000002788 crimping Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000000641 cold extrusion Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 3
- 238000009957 hemming Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
-
- 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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/002—Positioning devices
-
- 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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
- B21D5/08—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles making use of forming-rollers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a slotting bush forming process and a slotting bush, which belong to the technical field of material forming and processing, wherein the slotting bush forming process comprises the following steps: s1: leading out a metal strip with the width being the same as the circumference of the cross section of the slotted bushing and provided with a lubricating dry film on one side from the winding drum; s2: sequentially rolling the metal strip along the directions from two sides to the middle through a plurality of rollers, gradually curling the metal strip into a lap-edge cylinder type material to form a cylinder type material, and enabling a lubrication dry film to be positioned on the inner side of the cylinder type material; s3: cutting the cylindrical material into cylindrical parts with the same length as the slotted bushing to form the straight cylindrical slotted bushing. According to the invention, the barrel-shaped part with the lapping edge is directly formed in a width-direction winding mode, the phenomenon of edge warping does not occur at the lapping edge position, the forming quality is good, the cutting is convenient, and the size of the slotted bushing in the length direction can be ensured.
Description
Technical Field
The invention relates to the technical field of material forming and processing, in particular to a slotted bushing forming process and a slotted bushing.
Background
Modern aircraft operating environments are generally complex and subject to limitations in terms of external loads, environment, human factors, and economics, and in order to adapt the aircraft to the severe changes in these operating environments and extend the service life of the aircraft, the FAR25.571 appendix 45 mandates the use of "fail-safe standards" in the design of the main components of the aircraft structure, while incorporating the inspection requirements of "damage tolerance" in the maintenance plan. In general, the service life of the connecting piece is prolonged by adopting a cold extrusion process, wherein the cold extrusion is a reinforcement process for assembling various connecting fasteners on aircraft parts/components, and can apply effective residual compressive stress on the surface layer of a reinforcement hole, thereby greatly improving the fatigue and crack resistance of the hole. Whereas cold extrusion holes are usually realized with bushings.
Because cold extrusion using a split bush has a longer fatigue life than direct cold extrusion using a mandrel, the hole extrusion strengthening technique mainly adopts the split bush for cold extrusion strengthening. The slotted bushing is cylindrical, the cylinder walls are overlapped together along the axial direction, and one end part of the slotted bushing is outwards turned. In order to ensure that the split bush is not wrinkled or damaged during the extrusion process, the split bush material is required to be a high-strength and high-elasticity metal material.
When the slotted bushing is installed, the lap joint structure is convenient to cling to a mandrel of a special installation tool (the mandrel is provided with a bulge), one end which is not turned up passes through a hole to be reinforced, then the other end of the slotted bushing is turned up through the special installation tool, so that the slotted bushing is fixed in the hole to be reinforced through turned up at two ends, after the installation process, the mandrel of the special installation tool props up the lap joint part of the slotted bushing (the prop-up operation and the turn-up operation are carried out simultaneously), and finally the slotted bushing is attached to the hole to be reinforced. In order to avoid the phenomenon that the slotted bushing and the mandrel are in sliding adhesion in the installation process to cause the slotted bushing to axially move in the hole so as to scratch the hole wall, the inner side of the slotted bushing is required to be provided with a lubricating dry film, and the lubricating dry film has enough strength and coverage rate and is non-corrosive to a base material.
At present, the forming process of the slotted bushing is to lead out and shape a strip/coiled material with a lubricating dry film on one side from a steel coil, wind the strip/coiled material into a cylindrical shape in the length direction, cut the strip/coiled material by a blanking machine and then turn the strip/coiled material into a slotted bushing. The method can realize continuous production of the slotted bushing, but after the strip/coiled material is coiled in the length direction, the subsequent strip/coiled material is positioned in the tangential direction of the tubular part, after cutting, the lap joint position cannot be well attached, the phenomenon of edge warping can occur, the forming quality of the slotted bushing is affected, and even the subsequent processing steps are added for shape correction.
Disclosure of Invention
The invention aims to provide a slotting bush forming process and a slotting bush, which are used for solving the problems that the slotting bush is edge-warped due to the fact that the existing slotting bush is formed by winding a strip/coiled material in the length direction, the forming quality of the slotting bush is affected, and even the process steps are increased.
The technical scheme for solving the technical problems is as follows:
a slotting lining forming process comprises the following steps:
s1: leading out a metal strip with the width being the same as the circumference of the cross section of the slotted bushing and provided with a lubricating dry film on one side from the winding drum;
s2: sequentially and continuously rolling the metal strip along the directions from two sides to the middle through a plurality of rollers, gradually curling the metal strip into a lap-edge cylinder type material to form a cylinder type material, and enabling a lubrication dry film to be positioned at the inner side of the cylinder type material;
s3: cutting the cylindrical material into cylindrical parts with the same length as the slotted bushing to form the straight cylindrical slotted bushing.
Further, the step S3 is followed by a step S4: and curling one end of the straight cylinder type slotting lining to form the curling type slotting lining.
Further, the rollers are arranged at intervals in a straight line, and support assemblies are arranged on both sides of the rollers and before cutting; the arc outer side surface of the roller is provided with an annular roller groove, two ends of the roller groove are respectively provided with an arc surface, and the curvature radius of the arc surface is smaller than the design curvature radius of the corresponding position of the slotted bushing;
in the step S2, the metal strip sequentially passes through the rolling grooves of all rollers, all rollers sequentially synchronously roll the two sides of the metal strip in arc shape, and the metal strip rebounds to the designed curvature radius of the corresponding position of the slotted bushing after being rolled by the rollers.
Further, the roller comprises a plurality of forming wheels and at least 1 lapping wheel, wherein the forming wheels are sequentially arranged and close to the winding drum, and the lapping wheels are sequentially arranged and far away from the winding drum;
the curvature radius of the arc-shaped surfaces at two ends of the rolling groove of the forming wheel is consistent, and the curvature radius of the arc-shaped surface at one end of the rolling groove of the lapping wheel is equal to the curvature radius of the arc-shaped surface of the rolling groove of the forming wheel and is larger than the curvature radius of the arc-shaped surface at the other end of the rolling groove of the lapping wheel;
in step S2, when the metal strip is rolled by the forming wheel furthest from the winding drum, both sides of the metal strip are in contact with each other.
Further, the number of the lapping wheels is 1.
Further, all the rollers are respectively connected with a driver;
in step S2, all the drivers work synchronously to drive all the rollers to move synchronously.
Further, the support assembly comprises a first support piece and a second support piece which are close to each other, and a cavity for extending out of the corresponding curled metal strip is formed between the first support piece and the second support piece.
Further, the arc-shaped side surfaces of all the rollers are coplanar, and the depths of all the roller grooves are the same; the roller closest to the winding drum, the roller farthest from the winding drum and at least one middle roller are provided with supporting wheels in a matched mode, and the supporting wheels are used for feeding metal strips; the support wheel nearest to the reel cooperates with a corresponding roller for the first crimping of the metal strip.
Further, in the step S3, the cylindrical material is sleeved on the mandrel during cutting, and the cylindrical material is cut by two semicircular cutting blades which are oppositely arranged.
A slotting bush produced by adopting the slotting bush forming process.
The invention has the following beneficial effects:
(1) According to the invention, after the metal strip with the lubricating dry film on one side is led out from the winding drum, the cylindrical material with the lapping edge is directly formed in a mode of winding in the width direction, the phenomenon of edge warping does not occur at the lapping edge position, the forming quality is good, the cylindrical material is transversely cut when the cutting is carried out subsequently, the cutting is convenient, and the size of the slotted bushing in the length direction can be ensured.
(2) According to the invention, the metal strip is coiled in the width direction sequentially through the plurality of roller pairs, so that the metal strip is coiled into a cylinder gradually (firstly deformed at the edge and then the deformed position gradually moves towards the middle), namely, the same position is deformed only once in the width direction of the metal strip, and cold work hardening of the same position of the metal strip due to multiple deformations is avoided.
(3) According to the invention, the metal strip is wound into the slotted cylinder shape through the plurality of forming wheels (rebounding after winding), and then the slotted cylinder shape is wound into the scrap shape through the smaller number of scrap wheels, and the slotted bushing is supported through the supporting wheels during the first winding, so that the edge of the slotted bushing after forming is curved, and the edge warping phenomenon in the prior art can not occur.
Drawings
FIG. 1 is a schematic illustration of a split bushing forming process of the present invention;
FIG. 2 is a schematic side view of a roller and a support wheel of the present invention and a schematic forming process of a tube-shaped material;
FIG. 3 is a schematic view of a roller according to the present invention;
FIG. 4 is a schematic view of the forming wheel of the present invention;
FIG. 5 is a schematic illustration of the fit between the forming wheel and the support wheel of the present invention;
FIG. 6 is a schematic view of the construction of the bond wheel of the present invention;
FIG. 7 is a schematic view of a support assembly according to the present invention;
fig. 8 is a schematic structural view of a straight cylinder type split bush and a hemming type split bush.
In the figure: 10-winding drum; 21-a forming wheel; 22-lapping wheel; 23-rolling grooves; 24-arc surface; 30-supporting wheels; 40-a support assembly; 41-a first support; 42-a second support; 43-cavity; 50-mandrel; 51-a cutting blade; 60-metal strip; 61-barrel.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
Example 1
Referring to fig. 1 to 7, the present embodiment provides a process for forming a split bush, in which a metal strip 60 with a lubricant dry film on one side is led out from a reel 10, a overlapped cylindrical material 61 is directly formed by winding in a width direction, the cylindrical material 61 is cut to form a straight cylindrical split bush, and one end of the straight cylindrical split bush is curled to form a curled-type split bush, see fig. 8.
The slotting bush forming process of the embodiment comprises the following steps:
s1: a metal strip 60 of the same width as the circumference of the slotted liner cross-section and provided with a dry film of lubrication on one side is led from the reel 10.
In the subsequent step, the passive discharging of the reel 10 ensures the consistency of the feeding in the subsequent step.
S2: the metal strip 60 is rolled successively in the directions from both sides to the middle by a plurality of rollers, and the metal strip 60 is gradually curled into a hemming cylinder (i.e., curled into a hemming cylinder from the width direction) to form a cylinder 61, and at this time, the lubrication dry film is located inside the cylinder 61.
The tensile strength of the metal strip 60 used in this example was 500MPa to 2000MPa, and the elongation was 10% to 50%.
All rollers are straight lines and are arranged at intervals, and all rollers face the same direction, so that the rotating shafts of all rollers are parallel and are positioned on the same plane, the rolling mode of the rollers is arc rolling, namely, the positions of the rollers extruding two sides of the metal strip 60 are arc, and each deformation of the metal strip 60 is arc deformation. All rollers are respectively connected with a driver, and all the drivers work synchronously to drive all the rollers to move synchronously. In this embodiment, the driver employs a motor.
The roller comprises a plurality of forming wheels 21 and at least 1 overlap wheel 22, all forming wheels 21 are sequentially arranged at positions close to the winding drum 10, and all overlap wheels 22 are sequentially arranged at positions far away from the winding drum 10. The forming wheel 21 and the lapping wheel 22 are respectively provided with a rolling groove 23, the depths of all the rolling grooves 23 are the same, and both ends of the rolling grooves 23 are respectively provided with an arc-shaped surface 24. In the same forming wheel 21, the curvature radius of the arc-shaped surfaces 24 at the two ends of the rolling groove 23 is consistent and smaller than the design curvature radius of the corresponding positions of the slotted bushings, and in all the forming wheels 21, the curvature radius of all the arc-shaped surfaces 24 is consistent. In the same overlap wheel 22, the radius of curvature of the curved surface 24 of one end of the roll groove 23 is equal to the radius of curvature of the curved surface 24 of the roll groove 23 of the forming wheel 21 and is larger than the radius of curvature of the curved surface 24 of the other end of the roll groove 23 of the overlap wheel 22. The width of the roll grooves 23 of all rolls is gradually reduced along the movement direction of the metal strip 60, and the two arcuate surfaces 24 of the last roll (i.e. the last overlap wheel 22) are connected so that the entire roll groove 23 is fan-shaped.
After the metal strip 60 is drawn out from the roll 10, one side thereof is sequentially brought into contact with the roll grooves 23 of all the forming wheels 21, the metal strip 60 is sequentially curled from both sides in the middle direction by synchronous arc roll pressing of the arc surfaces 24 at both ends, the metal strip 60 is gradually curled into a cylindrical shape due to the arc surfaces 24, and when the metal strip 60 is curled by the last forming wheel 21 (forming wheel 21 farthest from the roll 10), both sides of the metal strip 60 are brought into contact with each other and then rebound to generate a gap, as shown in fig. 2. Then, the metal strip 60 is contacted with the rolling groove 23 of the lapping wheel 22, and is curled by the arc-shaped surface 24 of the lapping wheel 22, and the two sides of the metal strip 60 are staggered when being wound due to the different curvature radiuses of the arc-shaped surfaces 24 at the two ends of the rolling groove 23 of the lapping wheel 22, so that a lapping cylinder type material 61 is finally formed.
During the crimping process, the metal strip 60 will rebound after crimping by each roller, the radius of curvature after rebound remaining the same as the design radius of curvature of the split bush.
To ensure the roundness of the cross section of the cylindrical material 61 and the molding quality of the split bush, the number of the taping wheels 22 is 1 in this embodiment, and taping crimping is completed at one time.
The roller closest to the reel 10 (forming wheel 21), the roller furthest from the reel 10 (overlap wheel 22) and at least one intermediate roller (forming wheel 21 or overlap wheel 22) cooperate with a support wheel 30 for feeding the metal strip 60, the support wheel 30 being shaped and structured so as to be able to curl and convey the metal strip 60 in cooperation with the corresponding roller. The supporting wheel 30 nearest to the winding drum 10 is matched with a corresponding roller for first curling the metal strip, so that the two side edges of the metal strip 60 are also arc-shaped, and the phenomenon of edge curling is avoided. Moreover, the bending force of the edge of the metal strip 60 is large, and the smooth bending and the bending quality can be ensured by the arrangement of the supporting wheels 30.
In other embodiments of the present invention, the number of the supporting wheels 30 engaged with the intermediate rollers may be 1, 2, 3, 4, etc., or the intermediate rollers may be in one-to-one correspondence with the supporting wheels 30, and the positions and the number may be set so as to be capable of effectively conveying the metal strip 60.
In the present embodiment, the supporting members 40 are provided on both sides of each roller and before cutting, for supporting, limiting and guiding the metal strip 60, and one supporting member 40 is shared between the adjacent rollers. In other embodiments of the present invention, the support assemblies 40 are separately provided on both sides of each roller. The support assembly 40 adjacent the mandrel 10 supports, retains and guides the unrolled metal strip 60 and thus also provides a sizing function.
The support assembly 40 comprises a first support 41 and a second support 42, the first support 41 and the second support 42 being close to each other, and a cavity 43 for the corresponding metal strip 60 to protrude is formed between the first support 41 and the second support 42, in particular, the shape of the cavity 43 matches the cross-sectional shape of the metal strip 60 in the corresponding position. Meanwhile, both ends of the first support 41 and the second support 42 are formed in an inward concave arc shape, so that the support assembly 40 can be as close to the roller as possible.
In order to avoid cold working hardening of the metal strip 60, each roll groove 23 presses the metal strip 60 differently.
S3: the cylindrical material 61 is cut into cylindrical pieces having the same length as the split bush to form a straight cylindrical split bush. Before cutting, the cylindrical material 61 is sleeved on the mandrel 50, and during cutting, the cylindrical material 61 is cut by the two semicircular cutting blades 51 which are oppositely arranged.
The embodiment also provides a split bush produced by the split bush forming process.
Example 2
The present embodiment differs from embodiment 1 in that step S3 is further followed by step S4: one end of the straight cylinder type slotted bushing is curled to form a curled type slotted bushing, please refer to fig. 8, the curling technology is consistent with the existing curling technology, and the details are not repeated here.
The embodiment also provides a split bush produced by the split bush forming process.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The slotting lining forming process is characterized by comprising the following steps of:
s1: leading out a metal strip with the width being the same as the circumference of the cross section of the slotted bushing and provided with a lubricating dry film on one side from the winding drum;
s2: sequentially and continuously rolling the metal strip along the directions from two sides to the middle through a plurality of rollers, gradually curling the metal strip into a lap-edge cylinder type material to form a cylinder type material, and enabling a lubrication dry film to be positioned at the inner side of the cylinder type material;
s3: cutting the cylindrical material into cylindrical parts with the same length as the slotted bushing to form the straight cylindrical slotted bushing.
2. The split bush molding process according to claim 1, further comprising step S4 after step S3: and curling one end of the straight cylinder type slotting lining to form the curling type slotting lining.
3. The process for forming the slotted bushing according to claim 1 or 2, wherein the rollers are arranged at intervals in a straight line, and support assemblies are arranged on both sides of the rollers and before cutting; the outer side surface of the circular arc of the roller is provided with a ring-shaped rolling groove, two ends of the rolling groove are respectively provided with an arc surface, and the curvature radius of the arc surfaces is smaller than the design curvature radius of the corresponding position of the slotted bushing;
in the step S2, the metal strip sequentially passes through the rolling grooves of all rollers, all rollers sequentially synchronously roll the two sides of the metal strip in arc shape, and the metal strip rebounds to the designed curvature radius of the corresponding position of the slotted bushing after passing through the rollers for rolling.
4. A split bush forming process according to claim 3, wherein the roller comprises a plurality of forming wheels and at least 1 overlap wheel, the forming wheels are arranged in sequence and close to the winding drum, and the overlap wheels are arranged in sequence and far away from the winding drum;
the curvature radius of the arc-shaped surfaces at two ends of the rolling groove of the forming wheel is consistent, and the curvature radius of the arc-shaped surface at one end of the rolling groove of the lapping wheel is equal to the curvature radius of the arc-shaped surface of the rolling groove of the forming wheel and is larger than the curvature radius of the arc-shaped surface at the other end of the rolling groove of the lapping wheel;
in step S2, when the metal strip is rolled by the forming wheel furthest from the winding drum, both sides of the metal strip are in contact with each other.
5. The split bush molding process of claim 4, wherein the number of overlap wheels is 1.
6. A split bush forming process according to claim 3, wherein all the rollers are respectively connected with a driver;
in step S2, all the drivers work synchronously to drive all the rollers to move synchronously.
7. A split bush forming process according to claim 3, wherein the support assembly comprises a first support and a second support which are adjacent to each other, a cavity for the corresponding metal strip to extend out is formed between the first support and the second support, and both ends of the first support and the second support are arc-shaped.
8. A split bush forming process as claimed in claim 3, wherein the arcuate sides of all the rollers are coplanar and the depths of all the roller grooves are the same; the roller closest to the winding drum, the roller farthest from the winding drum and at least one middle roller are provided with supporting wheels in a matched mode, and the supporting wheels are used for feeding metal strips; the support wheel nearest to the reel cooperates with a corresponding roller for the first crimping of the metal strip.
9. The process for forming a split bush according to claim 1 or 2, wherein in step S3, a cylindrical material is sleeved on a mandrel during cutting, and the cylindrical material is cut by two semicircular cutting blades which are arranged oppositely.
10. A split bush produced by the split bush forming process according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311466722.1A CN117444539A (en) | 2023-11-07 | 2023-11-07 | Slotting bush forming process and slotting bush |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311466722.1A CN117444539A (en) | 2023-11-07 | 2023-11-07 | Slotting bush forming process and slotting bush |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117444539A true CN117444539A (en) | 2024-01-26 |
Family
ID=89581535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311466722.1A Pending CN117444539A (en) | 2023-11-07 | 2023-11-07 | Slotting bush forming process and slotting bush |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117444539A (en) |
-
2023
- 2023-11-07 CN CN202311466722.1A patent/CN117444539A/en active Pending
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