CN109967676A - The forming method of integrated bevel shell mold tool and integrated conical shell - Google Patents
The forming method of integrated bevel shell mold tool and integrated conical shell Download PDFInfo
- Publication number
- CN109967676A CN109967676A CN201711447909.1A CN201711447909A CN109967676A CN 109967676 A CN109967676 A CN 109967676A CN 201711447909 A CN201711447909 A CN 201711447909A CN 109967676 A CN109967676 A CN 109967676A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005242 forging Methods 0.000 claims abstract description 112
- 239000012043 crude product Substances 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000000047 product Substances 0.000 claims abstract description 11
- 230000010354 integration Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000002184 metal Substances 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 11
- 238000000465 moulding Methods 0.000 description 4
- 238000010792 warming Methods 0.000 description 4
- 241000353097 Molva molva Species 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 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
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K21/00—Making hollow articles not covered by a single preceding sub-group
- B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
- B21K21/10—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs cone-shaped or bell-shaped articles, e.g. insulator caps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention discloses a kind of integrated bevel shell mold tool and the forming methods of integrated conical shell, after forging material is processed into reducing tubular forging, the inner surface and the outer surface of reducing tubular forging is formed simultaneously with integrated bevel shell mold of the present invention tool and obtains the crude product of integrated conical shell forging, obtains target product after thermally treated and finishing.Through the above scheme, can be by the directly integrated die-forging forming of conical shell forging, mouthpiece portion and body part are manufactured with process, complex stress area between variable diameter cylinder and ozzle can form continuous metal streamline, and safety is higher, and save materials, process-cycle is short, improves production efficiency.
Description
Technical field
The present invention relates to nuclear reactor steam generator field more particularly to nuclear reactor steam generator integrated bevels
The forming method of shell forging.
Background technique
Nuclear reactor steam generator undertakes Core cooling agent and the heat exchange of steam, and the function that high steam is exported.
And integrated conical shell forging is connected to upper shell and lower shell as its important casing component, carries and changes high steam
Direction is passed in and out, high temperature stagnant area is eliminated, increases Core cooling agent and steam effective heat exchange area, mentions heat exchange efficiency
It is high.Integrated conical shell forging is in the middle position of nuclear reactor steam generator, belongs to nuclear safety level-one and caryoplasm protects level-one
Equipment, manufacturing process is complicated, and quality control and process control are stringent, to a certain extent, represents nuclear island bearing device system
Make the highest level of ability.
One end bore of nuclear reactor steam generator conical shell forging is larger, and other end bore is smaller, and forging wall thickness
Relatively thin, there are a branch pipe boss for miner diameter end cylinder side, manufacture more complicated.Work is manufactured for this large-scale reducing cylinder forgings
Skill is typically all to directly adopt open die forging both at home and abroad at present, is forged into isometrical cylinder, and the internal diameter of the small-caliber end of conical shell forging is made
For the basic internal diameter of cylinder forgings, basic outer diameter of the outer diameter of the large diameter end of conical shell forging as cylinder forgings.Using such
The product of method forging, material consumption weight is almost twice of product forging, and the region surplus of S-curve form is larger, leads
Cause property heat treatment stage forging interior tissue uneven, heat treatment rear surface is preferably organized to be processed smear removal, internal
Heterogeneous structure becomes product surface, and to the subsequent use of product, there may be adverse effects.This isometrical cylinder forgings integrally add
Spare time amount is larger, is also a kind of wasting of resources for manufacturer to manufacturing, and biggish machining allowance will consume more manpowers
Material resources generate more production waste, and the production cycle is long, and the branch pipe boss of miner diameter end cylinder side is added using cutting
Work removes molding from large cylinder, and branch pipe boss and conical shell forging body cannot form continuous metal streamline, holds in junction
Biggish quality problems are easily caused, quality is very unstable.
Summary of the invention
In view of current integrated conical shell forging part forming method above shortcomings, the present invention provides a kind of integration
The forming method of conical shell mold and integrated conical shell, can be by the directly integrated die-forging forming of conical shell forging, mouthpiece portion and ontology
Part is manufactured with process, and the complex stress area between variable diameter cylinder and ozzle can form continuous metal streamline, and safety is higher, and
Materials are saved, the process-cycle is short, improves production efficiency.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that
Integrated bevel shell mold tool, including mo(u)ld top half mold, mo(u)ld bottom half mold and plug, the mo(u)ld top half mold and mo(u)ld bottom half mold difference
Outer surface and the inner surface of reducing cylinder forgings are set, and the mo(u)ld bottom half mold is reducing bar shape, the axis of the mo(u)ld bottom half mold
Line is equipped with through-hole, and in through-holes, the outer surface of the mo(u)ld bottom half mold is equipped with the first type chamber, first type for the plug socket
The shape of chamber in the longitudinal direction is adapted with the inner surface configuration of integrated conical shell.
According to one aspect of the present invention, the plug includes barred body and pressure body, and barred body is arranged in the pressure body
The minimum outer diameter that the joint face of one end, the pressure body and barred body is set as plane and pressure body is greater than the internal diameter of through-hole.
According to one aspect of the present invention, the mo(u)ld top half mold includes mo(u)ld top half die ontology, on the mo(u)ld top half die ontology
End is equipped with bonding pad, and lower end is equipped with second type chamber, is equipped with mounting groove in the middle part of the bonding pad, on the side wall of the mounting groove two sides
Equipped with mounting hole, the second type chamber is adapted with the outer shape of integrated conical shell in the longitudinal direction, the second type chamber
In the direction of the width to be arc-shaped, the diameter of the circular arc is consistent with the integration outer diameter of conical shell.
The forming method of integrated conical shell forging, the forming method of the integration conical shell forging the following steps are included:
Forging material is processed into isometrical tubular forging；
Isometrical cylinder is processed into reducing tubular forging；
Connected by the setting of reducing tubular forging on integrated bevel shell mold tool with having with integrated bevel shell mold using die forging
The forging equipment connect carries out rotation forging and stamping, makes the inner surface and the outer surface of reducing tubulose forging while molding obtains integrated conical shell
The crude product of forging；
Crude product is heat-treated；
Crude product after heat treatment is finished to obtain the target product of integrated conical shell forging.
According to one aspect of the present invention, described reducing tubular forging is arranged on integrated bevel shell mold tool is by reducing
The inner surface of tubulose forging is socketed on mo(u)ld bottom half mold, and the upper surface of reducing tubulose forging is matched with mo(u)ld top half mold is revolved
Turn forging and stamping.
According to one aspect of the present invention, the rotation forging and stamping are that 360 degree rotation forges and presses.
According to one aspect of the present invention, the pressure of the rotation forging and stamping is provided by 5000 t hydraulic press.
According to one aspect of the present invention, the forming method of the integration conical shell forging further includes that will forge material progress pier to pull out
Pier take a step suddenly, the pier takes a step rapid setting before forging material is processed into cylinder forgings.
The advantages of present invention is implemented: the present invention provides the forming method of a kind of integrated bevel shell mold tool and integrated conical shell,
After forging material is processed into reducing tubular forging, have with integrated bevel shell mold of the present invention by the inner surface of reducing tubular forging
It is formed simultaneously with outer surface and obtains the crude product of integrated conical shell forging, obtained target product after thermally treated and finishing, lead to
Above scheme is crossed, the directly integrated die-forging forming of conical shell forging, mouthpiece portion and body part can be manufactured with process, reducing cylinder
Complex stress area between body and ozzle can form continuous metal streamline, and safety is higher, and save materials, and the process-cycle is short,
Improve production efficiency.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the appearance diagram of integrated bevel shell mold of the present invention tool；
Fig. 2 is the appearance diagram of the mo(u)ld bottom half mold of integrated bevel shell mold of the present invention tool；
Fig. 3 is the appearance diagram of the plug of integrated bevel shell mold of the present invention tool；
Fig. 4 is the appearance diagram of the mo(u)ld top half mold of integrated bevel shell mold of the present invention tool；
Fig. 5 is the structural schematic diagram of the mo(u)ld bottom half mold of integrated bevel shell mold of the present invention tool；
Fig. 6 is the structural schematic diagram of the plug of integrated bevel shell mold of the present invention tool；
Fig. 7 is the structural schematic diagram of the mo(u)ld top half mold of integrated bevel shell mold of the present invention tool；
Fig. 8 is the side structure schematic diagram of the mo(u)ld top half mold of integrated bevel shell mold of the present invention tool；
Fig. 9 is the use state diagram of integrated bevel shell mold of the present invention tool；
Figure 10 is the forming process schematic diagram of the embodiment two of the forming method of integrated conical shell forging of the present invention；
Figure 11 is the forming process schematic diagram of the embodiment three of the forming method of integrated conical shell forging of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, integrated bevel shell mold tool, including top swage
Tool 1, mo(u)ld bottom half mold 2 and plug 3, the mo(u)ld top half mold 1 and mo(u)ld bottom half mold 2 be separately positioned on reducing cylinder forgings outer surface and
Inner surface, the mo(u)ld bottom half mold 2 are reducing bar shape, and the axis of the mo(u)ld bottom half mold 2 is equipped with through-hole 21,3 sets of the plug
It connects in through-hole 21, the outer surface of the mo(u)ld bottom half mold 2 is equipped with the first type chamber 22, and the first type chamber 22 is in the longitudinal direction
Shape is adapted with the inner surface configuration of integrated conical shell, and the first type chamber 22 includes first horizontal segment 221, the first bevel phase
222 and second horizontal segment 223, the first horizontal segment 221, the first bevel phase 222 and the second horizontal segment 223 are by from left to right successively
Connection, the concrete shape of the first type chamber 22 can be designed according to the inner wall shape of integrated conical shell, and the plug 3 includes stick
One end of barred body 31 is arranged in body 31 and pressure body 32, the pressure body 32, and the joint face of the pressure body 32 and barred body 31 is set
The minimum outer diameter for being set to plane and pressure body 32 is greater than the internal diameter of through-hole 21, and the pressure body 32 is set as cylindric, it is described on
Pattern tool 1 includes 1 ontology of mo(u)ld top half mold, and the 1 ontology upper end of mo(u)ld top half mold is equipped with bonding pad, and lower end is equipped with second type chamber 13,
Mounting groove 11 is equipped in the middle part of the bonding pad, the side wall of 11 two sides of mounting groove is equipped with mounting hole 12, the second type chamber
13 are adapted with the outer shape of integrated conical shell in the longitudinal direction, and the second type chamber 13 is circular arc in the direction of the width
Shape, the diameter of the circular arc is consistent with the integrated outer diameter of conical shell, and the second type chamber 13 includes third horizontal segment 131, groove
The 132, second bevel phase 133 of section and the 4th horizontal segment 134, the third horizontal segment 131, groove segment 132, the second bevel phase 133
With the 4th horizontal segment 134 by being sequentially connected from left to right.
In practical applications, the length A1 of the mo(u)ld bottom half mold 2 is set as 1250mm, the length of the first horizontal segment 221
Degree A2 is set as 225mm, and the outer diameter Φ 1 of the first horizontal segment 221 is set as 1520mm, described the and the length of horizontal segment
A3 is set as 400mm, and the outer diameter Φ 2 of second horizontal segment 223 is set as 1740mm, first bevel phase 222 and level
The angle ɑ in face is set as 10 degree, and the aperture Φ 3 of the through-hole 21 is set as 500mm.
The length B1 of the plug 3 is set as 2200mm, and the length B2 of the resistance body is set as 200mm, the barred body
31 outer diameter Φ 4 is set as 450mm, and the outer diameter Φ 5 of the resistance body is set as 750mm.
The length C1 of the mo(u)ld top half mold 1 is set as 1250mm, and the width C 2 of the mo(u)ld top half mold 1 is set as 600mm,
The height H1 of the mo(u)ld top half mold 1 is set as 420mm, and the internal diameter Φ 6 of the mounting hole 12 is set as 70mm, the mounting groove
11 length C3 is set as 1010mm, and the height H2 of the mounting groove 11 is set as 200mm, the length of the third horizontal segment 131
Degree D1 is set as 106mm, and the length D2 of the groove segment 132 is set as 275mm, and the height H3 of the groove segment 132 is set as
56mm, the angle beta between horizontal plane of the groove segment 132 are set as 10 degree, the length D3 setting of the 4th horizontal segment 134
1700mm, the groove segment 132 and the second bevel phase are set as 400mm, the arc diameter Φ 7 of the third horizontal segment 131
Arc diameter Φ 8 at 133 intersections is set as 1775mm, and the arc diameter Φ 9 of second horizontal segment 223 is set as
1940mm。
Embodiment two
It is mold described in embodiment one as described in Fig. 1 to Figure 10, used in the present embodiment.
Specific step is as follows for the present embodiment:
Step 1: it is processed forging material to obtain tubular forging.
Step 2: by the concentric reducing tubular forging of the tubular forging process of the straight tube in step 1.
Step 3: being pressed into mo(u)ld bottom half mold 2 for step 2 reducing tubular forging, be placed on it in outer circle of mo(u)ld bottom half mold 2, will
Plug 3 is connected after being socketed with mo(u)ld bottom half mold 2 with slewing, and the flat anvil on the hydraulic press of mo(u)ld top half mold 1 and 5000 ton is led to
Cross screw rod connection.
Step 4: slewing in step 5 is debugged with 5000 tons of hydraulic press, after the completion of debugging, carries out reaming
Forging and stamping, make slewing 360 degree rotation one week, and reducing tubular forging is driven to rotate a circle, and at the same time, connect with mo(u)ld top half mold 1
5000 tons of the hydraulic press connect applies pressure, makes mo(u)ld top half mold 1 to the outer surface of reducing tubular forging, mo(u)ld bottom half mold 2 is to reducing
The inner surface of tubular forging carries out moulding simultaneously, obtains the crude product of integrated conical shell forging.
Step 5: 900- is warming up to by Que≤400 degree Celsius crude product temperature Leng in step 4, then through 1-1.5 hours
945 degrees Celsius, and keep the temperature water cooling after 1-2 hours, crude product surface≤70 degree Celsius are cooled to, then to be warming up to 620-650 Celsius
Degree, and it is air-cooled after keeping the temperature 4-5 hours.Obtain the crude product through Overheating Treatment.
Step 6: the crude product in step 5 is finished, and the formation branch pipe boss in miner diameter end cylinder side obtains
To target product.
Embodiment three
As described in Fig. 1 to Fig. 9, Figure 11, the forging material of the present embodiment is using ASME SA-508/508M material, chemistry
Component content is as shown in table 1:
Table 1:
It is mold described in embodiment one used in the present embodiment.
Specific step is as follows for the present embodiment:
Step 1: forging ejection before being processed into tubular forging, needs to carry out multiple pier to blank to pull out, initial forging temperature are as follows:
1180 ± 20 DEG C, final forging temperature is >=850 DEG C；Total forging ratio is about >=3.5.The consistency that forging can be optimized in this way improves metal
The integrality of streamline keeps forging homogeneous, meets strong plasticity index.
Step 2: it is processed the forging material in step 1 to obtain tubular forging.
Step 3: by the concentric reducing tubular forging of the tubular forging process of the straight tube in step 2.
Step 4: being pressed into mo(u)ld bottom half mold 2 for step 3 reducing tubular forging, be placed on it in outer circle of mo(u)ld bottom half mold 2, will
Plug 3 is connected after being socketed with mo(u)ld bottom half mold 2 with slewing, and the flat anvil on the hydraulic press of mo(u)ld top half mold 1 and 5000 ton is led to
Cross screw rod connection.
Step 5: slewing in step 4 is debugged with 5000 tons of hydraulic press, after the completion of debugging, carries out reaming
Forging and stamping, make slewing 360 degree rotation one week, and reducing tubular forging is driven to rotate a circle, and at the same time, connect with mo(u)ld top half mold 1
5000 tons of the hydraulic press connect applies pressure, makes mo(u)ld top half mold 1 to the outer surface of reducing tubular forging, mo(u)ld bottom half mold 2 is to reducing
The inner surface of tubular forging carries out moulding simultaneously, obtains the crude product of integrated conical shell forging.
Step 6: 900- is warming up to by Que≤400 degree Celsius crude product temperature Leng in step 5, then through 1-1.5 hours
945 degrees Celsius, and keep the temperature water cooling after 1-2 hours, crude product surface≤70 degree Celsius are cooled to, then to be warming up to 620-650 Celsius
Degree, and it is air-cooled after keeping the temperature 4-5 hours.The crude product through Overheating Treatment is obtained, and its physicochemical property is tested, mechanical property
Energy performance assessment criteria is as shown in table 2:
Table 2:
Step 7: the crude product of physicochemical property qualification in step 6 is finished, the shape in miner diameter end cylinder side
At branch pipe boss, target product is obtained.
The advantages of present invention is implemented: the present invention provides the forming method of a kind of integrated bevel shell mold tool and integrated conical shell,
After forging material is processed into reducing tubular forging, have with integrated bevel shell mold of the present invention by the inner surface of reducing tubular forging
It is formed simultaneously with outer surface and obtains the crude product of integrated conical shell forging, obtained target product after thermally treated and finishing, lead to
Above scheme is crossed, the directly integrated die-forging forming of conical shell forging, mouthpiece portion and body part can be manufactured with process, reducing cylinder
Complex stress area between body and ozzle can form continuous metal streamline, and safety is higher, and save materials, and the process-cycle is short,
Improve production efficiency.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those skilled in the art is in technical scope disclosed by the invention, and any changes or substitutions that can be easily thought of, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be with the scope of protection of the claims
It is quasi-.
Claims (8)
1. integrated bevel shell mold has, which is characterized in that including mo(u)ld top half mold, mo(u)ld bottom half mold and plug, the mo(u)ld top half mold is under
Pattern has outer surface and the inner surface for being separately positioned on reducing cylinder forgings, and the mo(u)ld bottom half mold is reducing bar shape, under described
The axis of pattern tool is equipped with through-hole, and in through-holes, the outer surface of the mo(u)ld bottom half mold is equipped with the first type chamber for the plug socket,
The shape of the first type chamber in the longitudinal direction is adapted with the inner surface configuration of integrated conical shell.
2. integrated bevel shell mold according to claim 1 tool, which is characterized in that the plug includes barred body and pressure body,
The pressure body is arranged in one end of barred body, and the joint face of the pressure body and barred body is set as plane and the minimum of pressure body is outer
Diameter is greater than the internal diameter of through-hole.
3. integrated bevel shell mold tool according to claim 1 or 2, which is characterized in that the mo(u)ld top half mold includes top swage
Has ontology, mo(u)ld top half die ontology upper end is equipped with bonding pad, and lower end is equipped with second type chamber, is equipped with installation in the middle part of the bonding pad
Slot, the side wall of the mounting groove two sides are equipped with mounting hole, and the second type chamber is outer with integrated conical shell in the longitudinal direction
Portion's shape is adapted, the second type chamber be in the direction of the width it is arc-shaped, the diameter of the circular arc and integrated conical shell outside
Diameter is consistent.
4. the forming method of the integrated conical shell forging using the described in any item molds of claim 1-3, which is characterized in that institute
State the forming method of integrated conical shell forging the following steps are included:
Forging material is processed into isometrical tubular forging；
Isometrical cylinder is processed into reducing tubular forging；
By the setting of reducing tubular forging on integrated bevel shell mold tool, rotation forging and stamping are carried out, make to obtain integrated conical shell forging
Crude product；
Crude product is heat-treated；
Crude product after heat treatment is finished to obtain the target product of integrated conical shell forging.
5. the forming method of integration conical shell forging according to claim 4, which is characterized in that described to forge reducing tubular
The reducing tubulose forging to be socketed in the inner surface of reducing tubulose forging on mo(u)ld bottom half mold is arranged on integrated bevel shell mold tool in part
The upper surface of part matches with mo(u)ld top half mold and carries out rotation forging and stamping.
6. the forming method of integration conical shell forging according to claim 4, which is characterized in that the rotation, which is forged and pressed, is
360 degree rotation forging and stamping.
7. according to the forming method of the described in any item integrated conical shell forging of claim 4-6, which is characterized in that the rotation
The pressure of forging and stamping is provided by 5000 t hydraulic press.
8. according to the forming method of the described in any item integrated conical shell forging of claim 4-6, which is characterized in that further include by
Forging material carries out the pier that pier pulls out and takes a step suddenly, and the pier takes a step rapid setting before forging material is processed into cylinder forgings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711447909.1A CN109967676A (en) | 2017-12-27 | 2017-12-27 | The forming method of integrated bevel shell mold tool and integrated conical shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711447909.1A CN109967676A (en) | 2017-12-27 | 2017-12-27 | The forming method of integrated bevel shell mold tool and integrated conical shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109967676A true CN109967676A (en) | 2019-07-05 |
Family
ID=67071276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711447909.1A Pending CN109967676A (en) | 2017-12-27 | 2017-12-27 | The forming method of integrated bevel shell mold tool and integrated conical shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109967676A (en) |
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2017
- 2017-12-27 CN CN201711447909.1A patent/CN109967676A/en active Pending
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