CN109604472A - A kind of sleeve manufacturing process - Google Patents
A kind of sleeve manufacturing process Download PDFInfo
- Publication number
- CN109604472A CN109604472A CN201811499540.3A CN201811499540A CN109604472A CN 109604472 A CN109604472 A CN 109604472A CN 201811499540 A CN201811499540 A CN 201811499540A CN 109604472 A CN109604472 A CN 109604472A
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- die
- blank
- forming
- flange
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- 238000004519 manufacturing process Methods 0.000 title abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 49
- 238000007493 shaping process Methods 0.000 claims abstract description 24
- 238000004080 punching Methods 0.000 claims abstract description 20
- 238000003801 milling Methods 0.000 claims abstract description 11
- 230000007704 transition Effects 0.000 claims description 21
- 238000009966 trimming Methods 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 10
- 238000000137 annealing Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000000465 moulding Methods 0.000 abstract 2
- 238000009740 moulding (composite fabrication) Methods 0.000 description 34
- 238000010586 diagram Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/10—Making other particular articles parts of bearings; sleeves; valve seats or the like
-
- 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
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- 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
- B21D37/10—Die sets; Pillar guides
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A kind of sleeve manufacturing process comprising following steps: step A, blanking and drawing make blank preform by blank through first time punch forming, and step B carries out second of drawing, carries out second of punch forming to the stamping forming blank of step A.Step C provides a mold, completes the flange portion using a punching stroke to the molding blank of step B and forms, bottom surface excision and the vertical tube part shaping.Step D carries out milling to the molding blank of step C, forms straight wall oral area circular arc, complete the final processing of the sleeve.A kind of sleeve forming method provided by the present invention, compared with the existing technology for, reduce forming process and vehicle basic skill or training's sequence, also just reduce influence of the multi-position furnace to surface quality of workpieces, while improving part material utilization rate.
Description
Technical Field
The invention relates to the technical field of stamping, in particular to a method for forming a sleeve part.
Background
Fig. 1 is a schematic cross-sectional structure diagram of an engine sleeve, and referring to fig. 1, the sleeve is made of 1Cr21Ni5Ti, and the thickness of the material is 2 mm. The sleeve 1 comprises a straight cylinder part 11 and a flange part 12, wherein the radius of a transition arc between the straight cylinder part 11 and the flange part 12 is 2mm, the outer diameter of the straight cylinder part 11 is 40mm, the outer diameter of the flange part 12 is 50mm, the bottom surface of the straight cylinder part 11 is an arc surface with the radius of 233mm, the height from the bottom of the arc surface to the end surface of the flange part 12 is 17.5mm, and the transition arc radius between the straight cylinder part and the flange part is only 2mm, so that the processing technology of punching a flange edge after multi-process drawing and shaping and turning the bottom is adopted at present.
FIG. 2 is a schematic illustration of a prior art process for manufacturing the engine sleeve of FIG. 1; referring to fig. 2, the conventional manufacturing process sequence includes the following steps:
1. blanking and deep drawing: firstly, punching a blank with the diameter of 77mm, and then carrying out primary punching operation to perform the blank;
2. punching a flange: punching and trimming the flange part of the blank after the first drawing;
3. and (3) second drawing: the diameter of the cylinder part of the blank is equal to that of the straight cylinder part 11 of the sleeve 1, and then annealing is carried out to eliminate stress and recover plasticity;
4. shaping and punching a flange: shaping to a desired radius and die-cutting, trimming and forming the flange portion 12
5. Vehicle bottom: bottom removal by lather
6. Milling bottom cambered surface
After the second drawing and forming in the step 3, annealing treatment is needed and then the operation in the step 4 is needed, that is, in the existing production process, four times of punching, one time of turning and one time of milling operation are needed, the process flow is complicated, three times of operation platforms (a punch press, a lathe and a milling machine) need to be switched, each process uses a respective tool, in order to ensure the punching allowance and the turning and milling allowance of the subsequent die, a large circular blank needs to be used, as marked in the blanking and drawing in the step 1, the blank needs to be kept with the diameter of 77mm, so that the material utilization rate is not high, and the production efficiency is also low.
Disclosure of Invention
The present invention seeks to provide a sleeve forming method which reduces or avoids the aforementioned problems.
In order to solve the technical problem, the invention provides a sleeve forming method, wherein the wall thickness of the sleeve is 2mm, the sleeve comprises a straight cylinder part and a flange part, the radius of a transition circular arc between the straight cylinder part and the flange part is 2mm, and the method comprises the following steps:
step A, blanking and deep drawing, namely performing first punch forming on the blank to perform the blank,
step B, performing secondary drawing, performing secondary punch forming on the blank punched and formed in the step A, ensuring that a flange with enough size is used for forming the flange part subsequently, and enabling the height of the whole blank to reach the height of the blank at the stage to be milled; then annealing to eliminate stress;
and step C, providing a die, completing the forming of the flange part, cutting the bottom surface and shaping the straight cylinder part by utilizing one-time stamping stroke on the blank formed in the step B, wherein the die comprises an upper die assembly and a lower die assembly which are coaxially arranged, the upper die assembly comprises an upper die plate, and a first male die and a first female die which are coaxially arranged and fixedly connected with the upper die plate, two trimming edges are symmetrically arranged on the outer side of the first female die, the height difference H1 between the end surface of the first male die and the end surface of the first female die is smaller than the height H2 of the blank by 1mm, the lower die assembly comprises a lower die plate, and a first male die and a first female die which are coaxially arranged and fixedly connected with the lower die plate, a slidable top ring is arranged between the first male die and the first female die, and at least three ejector rods penetrating through the lower die plate are arranged below the top.
And D, milling the blank formed in the step C, forming a straight-wall opening arc, and finishing the final processing of the sleeve.
Preferably, in step B, the diameter of the cylindrical portion of the billet is made not smaller than the diameter of the straight cylindrical portion of the sleeve.
Preferably, in step C, the first male die is of a rod-shaped structure, the first female die is of an annular structure and is arranged around the first male die, and the inner side edge of the bottom of the first female die is provided with a transition fillet with a radius of 2 mm.
Preferably, in the step C, the first punch-die is of an annular structure, a through hole corresponding to the first punch is formed in the top of the first punch-die, and the first die surrounds the first punch-die.
Preferably, in the step C, the ejector rods are uniformly distributed along the axial lines of the first punch-die and the first die at angular intervals.
Preferably, in step C, the working process of the mold is as follows: and C, inverting the blank formed in the step B on the first male-female die, descending the upper die assembly, firstly, shaping the transition arc between the straight cylinder part and the flange part of the blank by the first male die, punching a bottom hole when the first male die is contacted with the bottom surface of the blank, and simultaneously, continuously shaping the transition arc between the straight cylinder part and the flange part by the first male die. And finishing shaping at a transition arc position between the straight cylinder part and the flange part after the blank is tightly attached by the first concave-convex die and the top ring, and simultaneously clamping the blank by the first concave-convex die and the top ring to start inner hole flanging downwards. After the flanging is finished, the first concave-convex die and the first concave die start to carry out flange trimming to form a flange part, the generated annular excess material is cut into two pieces through the symmetrically distributed trimming blades, the shaping, the punching, the flanging and the flange trimming are finished in sequence at the moment, the upper die assembly moves upwards, and the ejector rod moves upwards to eject the formed blank, so that the whole forming and processing process is finished.
Preferably, in step C, the ejector pin is raised to bring the ejector ring into contact with the lower surface of the blank before the upper die assembly is lowered.
Preferably, in step C, the ejector pin is raised so that the top ring is 1mm lower than the lower surface of the blank before the upper die assembly descends.
Compared with the prior art, the sleeve forming method provided by the invention reduces the forming process and the vehicle bottom process, namely, in the invention, the automatic guiding of the convex-concave die fillet and the rigid support of the blank in the previous process are used for simultaneously performing a small amount of diameter-reducing drawing, thereby realizing the effective combination and integration of the working steps of drawing, shaping, punching, flanging, trimming and the like. The influence of multi-process forming on the surface quality of the part is reduced, and the material utilization rate of the part is improved.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein,
FIG. 1 is a schematic cross-sectional view of an engine sleeve;
FIG. 2 is a schematic illustration of a prior art process for manufacturing the engine sleeve of FIG. 1;
FIG. 3 is a schematic process flow diagram of a method of forming a sleeve according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure of a mold used in step C of the method of fig. 3.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.
FIG. 1 is a schematic cross-sectional view of an engine sleeve; FIG. 3 is a schematic process flow diagram of a method of forming a sleeve according to an embodiment of the present invention; fig. 4 is a schematic cross-sectional structure of a mold used in step C of the method of fig. 3. In fig. 4, the structure of the edge cutting blade is shown in a schematic enlarged view from a, and referring to fig. 1, 3 and 4, the present invention provides a sleeve forming method for processing a sleeve shown in fig. 1, wherein the sleeve 1 has a wall thickness of 2mm, and comprises a straight cylinder part 11 and a flange part 12, and a transition arc radius between the straight cylinder part 11 and the flange part 12 is 2mm, and the method comprises the following steps:
step A, blanking and deep drawing, namely performing first punch forming on the blank to perform the blank,
and step B, replacing the station and a stamping die (not shown in the figure), performing secondary drawing, performing secondary stamping forming on the blank subjected to stamping forming in the step A, ensuring that a flange (namely a flange part) with enough size is used for subsequent forming of the flange part 12, and enabling the height of the whole blank to reach the height of the blank at the stage to be milled, so that the diameter of the cylinder part of the blank is not less than that of the straight cylinder part 11 of the sleeve 1. Then annealing to eliminate stress and restore plasticity.
Step C, providing a die 100, completing the forming of the flange part 12, the bottom cutting and the shaping of the straight barrel part 11 by utilizing one-time stamping stroke on the blank 200 formed in the step B, wherein the die 100 comprises an upper die assembly 2 and a lower die assembly 3 which are coaxially arranged, the upper die assembly comprises an upper die plate 20, and a first male die 21 and a first female die 22 which are coaxially arranged and fixedly connected with the upper die plate 20, two trimming edges 23 are symmetrically arranged at the outer side of the first female die 22, the height difference H1 between the end surfaces of the first male die 21 and the first female die 22 is about 1mm smaller than the height H2 of a part (namely the blank 200) after secondary drawing, the lower die assembly 3 comprises a lower die plate 30, and a first male die 31 and a first female die 32 which are coaxially arranged and fixedly connected with the lower die plate 30, and a slidable top ring 33 is arranged between the first male die 31 and the first female die 32, at least three ejector rods 34 penetrating through the lower template 30 are arranged below the top ring 33.
The first male die 21 is of a rod-shaped structure, the first female die 22 is of an annular structure and is arranged around the first male die 21, the inner side edge of one end, in contact with the top ring 33, of the bottom of the first female die 22 is provided with a transition fillet with the radius of 2mm, so that the transition circular arc size (namely R2 shown in figure 1) between the straight tube part 11 and the flange part 12 can be guaranteed, the first male and female die 31 is of an annular structure, the top of the first female die 31 is provided with a through hole corresponding to the first male die 21, the inner diameter of the through hole is matched with the outer diameter of the first male die 21 according to a blanking gap, and therefore in the process that the bottom of the blank 200 is pressed downwards by the first male die 21, most of materials at the bottom of the blank 200 can be cut off through the edge of the through hole at the top of the. The diameter of the through hole may be slightly smaller than (the value obtained by multiplying the diameter of the middle layer of the tube portion of the blank 200 by the limit flanging factor of the material), and the diameter of the middle layer of the tube portion is (the outer diameter of the tube portion + the inner diameter of the tube portion)/2.
The first concave die 32 surrounds the first convex-concave die 31, the first concave die 32 provides a squeezing and cutting platform for the edge cutting blade 23 on one hand, and the first concave die 32 is matched with the first concave-convex die 22 on the other hand, so that redundant materials on the flange edge are cut off. The ejector rods 34 are uniformly distributed along the axial line angles of the first punch-die 31 and the first die 32, and generally only three ejector rods 34 are needed to realize uniform support of the ejector ring 33, and of course, more than three uniform distributions can be deployed on the ejector rods 34, so that the stress distribution of the ejector ring 33 is more uniform.
The external diameter of the first punch-die 31 equals the internal diameter of the straight cylinder part 11, the internal diameter of the first punch-die 22 equals the external diameter of the straight cylinder part 11, the internal diameter of the top surface of the first die 32 equals the external diameter of the flange part 12, the external diameter of the first punch-die 22 and the internal diameter of the top surface of the first die 32 match according to blanking gaps, the external diameter and the internal diameter of the top ring 33 respectively match with the internal diameter of the top surface of the first die 32 and the external diameter of the first punch-die 31 according to approximately 0.1mm gaps.
Referring to fig. 4, the working process of this step, that is, the working principle of the mold 100, is as follows: the blank 200 formed in the step B is placed upside down on the first punch-die 31, the ejector rod 34 is lifted, the ejector ring 33 is in contact with the lower surface of the blank 200 or slightly lower by about 1mm, then the upper die assembly 2 descends, the first punch-die 22 firstly begins to shape the blank 200 at the transition arc between the straight cylinder part 11 and the flange part 12 (i.e. at the position R2 shown in fig. 1), when the first punch 21 is in contact with the bottom surface of the blank 200, the bottom hole is punched, and meanwhile, the first punch-die 22 continues to shape the transition arc between the straight cylinder part 11 and the flange part 12. Finishing shaping at a transition arc position between the straight cylinder part 11 and the flange part 12 after the first male and female die 22 and the top ring 33 clamp the blank 200 to be attached, and simultaneously clamping the blank 200 by the first male and female die 22 and the top ring 33 to start inner hole flanging (or the shaping force is greater than the flanging force when the shaping at the transition arc position between the straight cylinder part 11 and the flange part 12 is nearly finished, the first male and female die 22 and the top ring 33 do not completely clamp the blank 200 to be attached, the inner hole flanging is started, and the size of a previous process can be adjusted according to the size requirement to ensure the height size of the flanging); to ensure the reliable flanging, the buffering force of the device can be adjusted to make the first male and female dies 22 and the top ring 33 clamp the blank 200 to prevent the material at the flange part from flowing. After the flanging is completed, the first concave-convex die 22 and the first concave die 32 start to perform flange trimming so as to form the flange part 12, and the generated annular excess material is cut into two pieces by the symmetrically distributed trimming blades 23, so that the flange part is easy to separate and drop. At this time, the shaping, the punching, the flanging and the flange edge cutting are completed in sequence, the upper die assembly 2 moves upwards, and the ejector rod 34 moves upwards to eject the formed blank 200, so that the whole forming and processing process is completed.
Since the die 100 provided in this step simultaneously performs a plurality of operations on the blank in one stamping stroke, the blank 200 formed in step B does not need to have too strict requirements for its size, which is a significant distinguishing feature of the present invention with respect to the prior art mentioned in the background art, for example, the diameter of the second step blank in the previous step may be phi 42, and the die 100 may also simultaneously perform the drawing step. Namely, drawing, shaping, punching, flanging and flange edge cutting are carried out simultaneously. Therefore, the drawing difficulty of the previous process can be reduced, the thinning of materials is reduced, and the product quality is favorably ensured. Therefore, it is not necessary to secure the diameter of the cylindrical portion of the blank to be equal to the diameter of the straight cylindrical portion 11 of the sleeve 1 at the time of the second press forming as in the background art.
And D, milling the blank formed in the step C, forming a straight-wall opening arc, and finishing the final processing of the sleeve 1. (the milling process is the same as the milling process in the prior art in the background art, which is not the point of the invention, and is not described again here)
In a specific embodiment, referring to fig. 1, a sleeve 1 to be machined and formed comprises a straight cylinder part 11 and a flange part 12, wherein the radius of a transition arc between the straight cylinder part 11 and the flange part 12 is 2mm, the outer diameter of the straight cylinder part 11 is 40mm, the outer diameter of the flange part 12 is 50mm, the bottom surface of the straight cylinder part 11 is an arc surface with the radius of 233mm, and the height from the bottom of the arc surface to the end surface of the flange part 12 is 17.5mm, and the method provided by the invention comprises the following preparation steps:
a, firstly punching a blank with the diameter of about 70mm, and then carrying out primary punching operation to pre-deform the blank; the diameter of the opening part of the formed blank is more than 54mm, the outer diameter of the barrel body part is 50mm, and the height between the bottom surface of the blank and the end surface of the opening part is 16.5 mm;
step B, replacing the station and the stamping die, performing secondary drawing, and performing secondary stamping forming on the blank subjected to stamping forming in the step A, wherein the diameter of an opening part of the formed blank is larger than 54mm, the outer diameter of the barrel body part is 40mm, and the height between the bottom surface of the blank and the end surface of the opening part is 19 mm;
step C, forming the flange part 12, cutting off the bottom surface and shaping the straight cylinder part 11 by using a one-step stamping stroke on the blank formed in the step B through a die 100, specifically, forming the flange part 12 on the blank formed in the step B, wherein the outer diameter of the flange part 12 is 50mm, the radius of a transition arc between the straight cylinder part 11 and the flange part 12 is 2mm, the straight cylinder part 11 is formed by punching the bottom surface of the blank formed in the step B, removing a material with the diameter of 29mm and then flanging and shaping, the outer diameter of the straight cylinder part 11 is 40mm, and the height between the bottom surface of the straight cylinder part 11 and the end surface of the flange part 12 is more than 19 mm;
and D, milling the blank formed in the step C, forming an arc surface with the diameter of 233mm on the bottom surface of the straight cylinder part 11, and finishing the preparation of the sleeve 1.
Compared with the prior art, the sleeve forming method provided by the invention reduces the forming process and the vehicle bottom process, namely, in the invention, the automatic guiding of the convex-concave die fillet and the rigid support of the blank in the previous process are used for simultaneously performing a small amount of diameter-reducing drawing, thereby realizing the effective combination and integration of the working steps of drawing, shaping, punching, flanging, trimming and the like. The influence of multi-process forming on the surface quality of the part is reduced, and the material utilization rate of the part is improved.
It should be appreciated by those of skill in the art that while the present invention has been described in terms of several embodiments, not every embodiment includes only a single embodiment. The description is given for clearness of understanding only, and it is to be understood that all matters in the embodiments are to be interpreted as including technical equivalents which are related to the embodiments and which are combined with each other to illustrate the scope of the present invention.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.
Claims (8)
1. A method of forming a sleeve having a wall thickness of 2mm, comprising a straight portion and a flange portion, the radius of a transition arc between the straight portion and the flange portion being 2mm, the method comprising the steps of:
step A, blanking and deep drawing, namely performing first punch forming on the blank to perform the blank,
step B, performing secondary drawing, performing secondary punch forming on the blank punched and formed in the step A, ensuring that a flange with enough size is used for forming the flange part subsequently, and enabling the height of the whole blank to reach the height of the blank at the stage to be milled; and then annealing to eliminate the stress.
And step C, providing a die, completing the forming of the flange part, cutting the bottom surface and shaping the straight cylinder part by utilizing one-time stamping stroke on the blank formed in the step B, wherein the die comprises an upper die assembly and a lower die assembly which are coaxially arranged, the upper die assembly comprises an upper die plate, and a first male die and a first female die which are coaxially arranged and fixedly connected with the upper die plate, two trimming edges are symmetrically arranged on the outer side of the first female die, the height difference H1 between the end surface of the first male die and the end surface of the first female die is smaller than the height H2 of the blank by 1mm, the lower die assembly comprises a lower die plate, and a first male die and a first female die which are coaxially arranged and fixedly connected with the lower die plate, a slidable top ring is arranged between the first male die and the first female die, and at least three ejector rods penetrating through the lower die plate are arranged below the top.
And D, milling the blank formed in the step C, forming a straight-wall opening arc, and finishing the final processing of the sleeve.
2. The method according to claim 1, wherein in step B, the diameter of the cylindrical portion of the billet is made not smaller than the diameter of the straight cylindrical portion of the sleeve.
3. The method according to claim 1, wherein in step C the first male die is of a rod-like configuration and the first female die is of a ring-like configuration, arranged around the first male die, the inner edge of the bottom of the first female die having a transition radius of 2 mm.
4. The method according to claim 3, wherein in the step C, the first punch-die plate is of an annular structure, a through hole corresponding to the first punch is arranged at the top of the first punch-die plate, and the first die plate is arranged around the first punch-die plate.
5. The method according to claim 1, wherein in step C, the ejector pins are angularly equispaced along the axis of the first punch-die and the first die.
6. The method according to any one of claims 1 to 5, wherein in step C, the working process of the mould is: and C, inverting the blank formed in the step B on the first male-female die, descending the upper die assembly, firstly, shaping the transition arc between the straight cylinder part and the flange part of the blank by the first male die, punching a bottom hole when the first male die is contacted with the bottom surface of the blank, and simultaneously, continuously shaping the transition arc between the straight cylinder part and the flange part by the first male die. And finishing shaping at a transition arc position between the straight cylinder part and the flange part after the blank is tightly attached by the first concave-convex die and the top ring, and simultaneously clamping the blank by the first concave-convex die and the top ring to start inner hole flanging downwards. After the flanging is finished, the first concave-convex die and the first concave die start to carry out flange trimming to form a flange part, the generated annular excess material is cut into two pieces through the symmetrically distributed trimming blades, the shaping, the punching, the flanging and the flange trimming are finished in sequence at the moment, the upper die assembly moves upwards, and the ejector rod moves upwards to eject the formed blank, so that the whole forming and processing process is finished.
7. The method of claim 6, wherein in step C, the ejector pin is raised to bring the top ring into contact with the lower surface of the blank before the upper die assembly is lowered.
8. The method of claim 6, wherein in step C, the ejector pin is raised such that the top ring is 1mm lower than the lower surface of the blank before the upper die assembly is lowered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811499540.3A CN109604472B (en) | 2018-12-09 | 2018-12-09 | Sleeve forming method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811499540.3A CN109604472B (en) | 2018-12-09 | 2018-12-09 | Sleeve forming method |
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| CN109604472A true CN109604472A (en) | 2019-04-12 |
| CN109604472B CN109604472B (en) | 2020-12-01 |
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| CN201811499540.3A Active CN109604472B (en) | 2018-12-09 | 2018-12-09 | Sleeve forming method |
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| CN110814179A (en) * | 2019-11-22 | 2020-02-21 | 上海交通大学 | Preparation method of inner annular zero-fillet convex blank |
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