CN106583620A - marine diesel engine crank bending forging tool and method - Google Patents
marine diesel engine crank bending forging tool and method Download PDFInfo
- Publication number
- CN106583620A CN106583620A CN201611188202.9A CN201611188202A CN106583620A CN 106583620 A CN106583620 A CN 106583620A CN 201611188202 A CN201611188202 A CN 201611188202A CN 106583620 A CN106583620 A CN 106583620A
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- Prior art keywords
- forging
- mold
- marine diesel
- lower mould
- crank
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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
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/04—Shaping in the rough solely by forging or pressing
-
- 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
- B21J13/06—Hammers tups; Anvils; Anvil blocks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
The invention provides a bending forging tool and a method for a crank of a marine diesel engine. The marine diesel crank bending forging tool comprises: a lower die supporting the forging, the lower die having a V-shaped opening forming a forming cavity in which the forging is forged; the upper die is abutted against the forge piece, the first side face of the upper die is a V-shaped anvil and is opposite to the first side face of the lower die, the third side face of the upper die is opposite to the second side face of the lower die, and the bottom face of the upper die is in the shape of an arc which is sunken upwards in the vertical direction. The bending forging method of the marine diesel engine crank adopts a bending forging tool of the marine diesel engine crank. The invention solves the hot working process defect formed in the forging and bending process of the crank and improves the material utilization rate.
Description
Technical field
The present invention relates to a kind of marine diesel crank bending forging tools and method.
Background technology
Wherein argosy crank is the critical component in marine engine, and which is to the steady of diesel engine, safe operation tool
There is most important effect.Curved forging method is to adopt most production technologies at present.The bending stage is played to pass to product final mass
Important effect.As depicted in figs. 1 and 2, ingot casting is forged into preformation by the mode that current crank forging technology first passes through open die forging
Base 5 ' in the middle of type, then using bend-forging, middle base 5 ' is placed on lower mould 3 ', middle base 5 ' is forged with mold 1 ',
V-shaped forging 52 ' is bent to, finally using technique is flattened, forging 52 ' finished product is forged to into.Crank forging technology is also deposited at present
In many problems, it is most prominent precisely due to forging defect and the stock utilization that causes is low.
In sum, there is problems with prior art：In marine diesel crank bending forging process, due to forging
Defect and the stock utilization that causes is low.
The content of the invention
The present invention provides a kind of marine diesel crank bending forging tools and method, to solve marine diesel crank bend
In bent forging process, the low problem of the stock utilization that caused due to forging defect.
For this purpose, the present invention proposes that a kind of marine diesel crank bends forging tools, it is for by forging molding, described peculiar to vessel
Diesel engine crank bending forging tools includes：
The lower mould of the forging, the lower mould is supported to have：Lower mould bottom surface, lower mould first side and lower mould
Second side, the lower mould first side and lower mould second side are both connected on the lower mould bottom surface；Under described
V-arrangement opening is formed between mould first side and lower mould second side, the V-arrangement opening forms the molding of the forging forging
Chamber；
The mold being pushed against on the forging, the mold are V-type anvil, and the V-type anvil includes：Mold bottom surface,
And the circumferential mold first side being connected on the mold bottom surface, mold second side, mold the successively
The 4th side of three sides and mold, the mold first side and the 3rd side of mold form v-angle；The upper mould
Tool second side and the 4th side of mold are parallel to each other；The mold first side and mold second side are intersected directly
Angle；
Wherein, the mold first side is facing with lower mould first side, and the 3rd side of the mold is with
Mould second side is facing, and the mold bottom surface is the circular arc that in the vertical direction is recessed upwards.
Further, angle of the v-angle of the V-type anvil more than the V-arrangement opening.
Further, the v-angle of the V-type anvil is 25 to 28 degree.
Further, the angle of the V-arrangement opening is 14 to 16 degree.
The present invention also proposes a kind of described marine diesel crank bending forging method, described marine diesel crank
Bend-forging method is comprised the following steps：
Step A：Ingot casting to molding carries out heating, upset, pulling and rounding, and ingot casting is forged into the forging of cylindrical shape
Part；
Step B：Pressing forging is carried out to the two ends of cylindrical shape forging, is made the two ends of forging form flat board, is made forging
Middle part is forged into the shape that cylinder adds round platform；Whole forging is made to form base in the middle of preforming, base bag in the middle of the preforming
Include：Cylinder, the round platform positioned at the cylinder two ends and the flat board positioned at the round platform two ends；
Step C：Base in the middle of the preforming is placed on the lower mould of marine diesel crank bending forging tools；
Step D：The mold that forging tools is bent using marine diesel crank is pressed in the middle of the preforming on base,
Forging molding is carried out to base in the middle of the preforming.
Further,
Step C specifically includes step C1：Make the flat support on the V-arrangement opening, the two ends of the flat board are stretched out
The V-arrangement opening, makes the V-arrangement opening contain the cylinder and round platform.
Further,
Step D specifically includes step D1：The mold bottom surface is made to be pressed on the arc surface of the cylinder, to described pre-
In the middle of molding, base carries out forging molding.
Further, angle of the v-angle of the V-type anvil more than the V-arrangement opening.
Further, the v-angle of the V-type anvil is 25 to 28 degree.
Further, the angle of the V-arrangement opening is 14 to 16 degree.
The present invention devises the V-type anvil with the circular arc bottom surface being recessed upwards, and devises again base in the middle of preforming
Shape, in the middle of the preforming, base includes：Cylinder, the round platform positioned at the cylinder two ends and positioned at the round platform two ends
Flat board；The circular arc bottom surface can be engaged with the cylinder of base in the middle of preforming, and round platform can be with the V-arrangement opening of lower mould
It is engaged, therefore, the cooperation of base in the middle of the mould of the present invention and preforming eliminates traditional moulds with forging stock contact site and week
The irregular deformation that these main plastic deformation positions of region are formed, and deformation defect are enclosed, indent, ultra-wide, accumulation can be eliminated
Deng forging defect, stock utilization is improved, reduce the production cost of product.
Description of the drawings
Fig. 1 is the principle schematic that existing marine diesel crank bends forging method, wherein, not yet it is curved forging
Make；
Fig. 2 is the principle schematic that existing marine diesel crank bends forging method, wherein, complete bending forging
Make；
Fig. 3 is the axonometric chart of base in the middle of the preforming of the marine diesel crank bending forging method employing of the present invention；
Fig. 4 is the front view of base in the middle of the preforming of the marine diesel crank bending forging method employing of the present invention；
Fig. 5 is the top view of base in the middle of the preforming of the marine diesel crank bending forging method employing of the present invention；
Fig. 6 is the principle schematic that the marine diesel crank of the present invention bends forging method, wherein, not yet it is curved
Forging；
Fig. 7 is the principle schematic that the marine diesel crank of the present invention bends forging method, wherein, complete bending forging
Make；
Fig. 8 is the structural representation of the mold of the present invention；
Fig. 9 is the schematic diagram of the product defects of existing marine diesel crank bending forging method, wherein for main view side
To；
Figure 10 is the schematic diagram of the product defects of existing marine diesel crank bending forging method, wherein for side-looking side
To.Drawing reference numeral explanation：
Under 1 ' mold 3 ', in the middle of mould 5 ', 52 ' forging 54 ' of base is cranked arm 541 ' region of root, 542 ' region 543 '
544 ' region of region
Forging after 1 mould of mold 3 times, 5 forging, 58 bend-forging
10 mold bottom surface, 11 first side, 12 mold second side, 13 the 3rd side of mold, 14 mold
Four sides, 15 mold top surface
30 times 33 times mould second sides of mould first side of mould bottom surface 31 times
The tangent plane (inclined-plane) of 50 cylinder, 51 round platform, 53 round platform, 55 flat board, 57 flat board, 510 round platform
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and effect, now control illustrates this
It is bright.
Applicant is had found in research process：In existing marine diesel crank bending forging process, such as Fig. 1 and Fig. 2
Shown, in bending deformation process, due to the seriality of material, stress presents the phenomenon along length direction diffusion of cranking arm.Forging
Neutral surface length stays constant inside base, does not affect by bending, causes in thickness direction near forging stock neutral line position stress
Minimum, forging stock surface stress maximum (wherein, for example in root 54 ' of cranking arm, the i.e. zone of action of mold 1 ' and forging 52 ').
Using the curved method of tradition forging, mould is main plastic deformation position with forging stock contact site and peripheral region.Such as Fig. 9 and
Shown in Figure 10, (such as at 541 ' place of region) compression chord, outside (such as at 542 ' place of region) tension stress on the inside of crank.Outward
At side (such as at 542 ' place of region) due to metal contracts formed pit, at inner side, (such as at 541 ' place of region) then forms material
Pile up；Larger irregular deformation is produced at region 543 ' and 544 ' two, ultra-wide and indent is formed.These defects can cause machine
Processing capacity increases, and lumber recovery is low, increases following process difficulty, or even produces waste product.Applicant further analyzes the class of defect
Type and reason, mainly have：
(1) pile up：In BENDING PROCESS, as the stress on the inside of V-arrangement is directed to root, root neutral surface inside material of cranking arm
Certain material stacking can be formed.Piling up to increase follow-up machining workload.
(2) pit：On the outside of root neutral surface of cranking arm, forging bends through journey by action of pulling stress, material outside under tension
Effect shrink so as to extend along the direction of center of deformation line, and due to not having enough metals to be mended at forging stock edge
Fill, based on the constancy of volume, incompressibility of material, at this, metal occurs along the contraction perpendicular to direction of cranking arm, and then forms the recessed of local
Hole, the appearance of pit also cause forging's block dimension at this to reduce, and cause stock utilization to decline, or even cause following process surplus
Deficiency, causes waste product.
(3) ultra-wide：There is plastic deformation in root of cranking arm during forging and stamping, neutral surface inner metal is caused by forging stock bending
The extruding of compressive stress and mold, the resistance less both sides flowing on width, and form ultra-wide but can increase ultra-wide
Amount of machining, reduces stock utilization.
(4) indent：While ultra-wide, acted on perpendicular to compressive stress of cranking arm by mold pressure, in V-arrangement region of cranking arm
Edge, surface metal flow in outward direction, due to metal seriality, while driving interior metal also to flow laterally, cause
The material cranked arm on the inside of neutral surface is lost in, and forms indent.The thickness of root of making to crank arm reduces, and can cause machining when indent is serious
Surplus is not enough, or even scraps forging.
Can also be further exacerbated by defects such as the stage of pressing, ultra-wide, indents.
For this purpose, the present invention proposes that a kind of marine diesel crank bends forging tools, for by forging molding, the present invention is right
Theory of plastic deformation of the forging of forging according to metal at knee and Deformation Flow is curved, forging has been carried out again
Improve, be made that the forging 5 (base in the middle of preforming) of suitable bend-forging.
As shown in Fig. 3, Fig. 4 and Fig. 5, the forging 5 (base in the middle of preforming) of the present invention includes：Cylinder 50, positioned at the circle
The round platform 51 and round platform 53 that cut out inclined-plane at post two ends, and positioned at the flat board 55 and flat board 57 at the round platform two ends, flat board
Length direction is parallel with the axis of cylinder and round platform；The upper surface of flat board is concordant with the side of round platform, the side above round platform
For example cut a part or cut out a platform, the side below round platform is facing directly with gradient, be i.e. the tangent plane of round platform is (oblique
Face) 510, for and the first side or lower mould second side of lower mould mutually extrude, contact, the side below round platform it is oblique
Degree is for example consistent with the gradient of the first side of lower mould or lower mould second side.Two round platforms can with regard to Cylindrical symmetry,
Two flat boards can be with regard to Cylindrical symmetry, and forging 5 (base in the middle of preforming) can be bilateral symmetry.Length of the platform for tabular
Cube shape, the width of platform are more than the diameter of cylinder 50, and round platform plays a part of transition connecting platform and cylinder, cylinder and round platform
The flowing of plastic deformation in follow-up bend-forging, can be made up, stress concentration and various defects is reduced.
So, during forging 5 (base in the middle of preforming) can overcome tradition forging, root 54 ' of cranking arm as in Figure 1 and Figure 2
Stress is larger or concentrates, and forms the problem of material stacking, can overcome on the outside of 54 ' neutral surface of root of cranking arm on the inside of root neutral surface
The caused pit phenomenon because of mobility；The compressive stress that root neutral surface inner metal of cranking arm can be overcome to be caused by forging stock bending
And the extruding of mold forms the phenomenon of ultra-wide；Mold pressure can be overcome perpendicular to the effect of compressive stress of cranking arm, in the V that cranks arm
The edge in shape region, the material on the inside of neutral surface of cranking arm are lost in, and form the problem of indent.
Forging 5 (base in the middle of preforming) be carry out heating by the ingot casting to molding, upset, pulling and rounding, by ingot casting
It is forged into the forging of cylindrical shape；Then pressing forging is carried out to the two ends of cylindrical shape forging, makes the two ends of forging form flat
Plate, makes the middle part of forging be forged into the shape that cylinder adds round platform.
As shown in Figure 6 and Figure 7, marine diesel crank of the invention bending forging tools includes：
The lower mould 3 of the forging, the lower mould 3 is supported to have：Lower mould bottom surface 30, lower 31 and of mould first side
Lower mould second side 33, the lower mould first side 31 and lower mould second side 33 are both connected to the lower mould bottom surface
On 30；V-arrangement opening is formed between the lower mould first side 31 and lower mould second side 33, the V-arrangement opening is formed
Forge the forming cavity of the forging；
The mold 1 being pushed against on the forging (base in the middle of preforming) 5, the mold are V-type anvil, as shown in figure 8,
The V-type anvil includes：Mold bottom surface 10, and circumferential the first side of mold being connected on the mold bottom surface successively
Face 11, mold second side 12, the 3rd side 13 of mold, the 4th side 14 of mold, and it is commonly connected to this four
The mold top surface 15 of side top, mold top surface 15 are plane, are beaten for bearing, the mold first side and upper
The 3rd side of mould forms v-angle；The mold second side and the 4th side of mold are parallel to each other；The mold
First side and mold second side meet at right angle；The horizontal cross-section of mold is rectangle；
Wherein, the mold first side 11 is facing with lower mould first side 31, is interacted；On described
The 3rd side 13 of mould and lower mould second side 33 are facing, are interacted；The mold bottom surface 10 is vertical
The circular arc being recessed on direction upwards, is engaged with the cylinder 50 with forging (base in the middle of preforming) 5, mold 1 is wrapped
The top of cylinder 50 is surrounded, the stress concentration or other deformation defects of root appearance of cranking arm in reducing forging process.
The present invention is allowed to be more suitable for bend-forging by carrying out structure improvement to forging (base in the middle of preforming) 5, reduces bent
Stress concentration or other deformation defects that arm roots occur, make forging have more preferable formability.Also, devise and match therewith
With upwards be recessed bottom surface mold, therefore, the formability of workpiece will be substantially improved, and can eliminate indent, ultra-wide, accumulation etc.
Forging defect, improves stock utilization, reduces the production cost of product.
Further, angle of the v-angle of the V-type anvil of mold more than the V-arrangement opening of lower mould, so that forging plasticity
Deformation.
Further, the v-angle of the V-type anvil is 25 to 28 degree, i.e. mold first side 11 and mold the 3rd
The angle of side 13 is 25 to 28 degree, so that forging has suitable flexibility.
Further, the angle of the V-arrangement opening of lower mould 3 is 14 to 16 degree, for example, 15 degree, makes crank in forming process
In, crook one's arm and bending will not occur.
The present invention also proposes a kind of described marine diesel crank bending forging method, described marine diesel crank
Bend-forging method is comprised the following steps：
Step A：Ingot casting to molding carries out heating, upset, pulling and rounding, and ingot casting is forged into the forging of cylindrical shape
Part；
Step B：Pressing forging is carried out to the two ends of cylindrical shape forging, is made the two ends of forging form flat board, is made forging
Middle part is forged into the shape that cylinder adds round platform；Whole forging is made to form base 5 (forging) in the middle of preforming, in the preforming
Between base 5 include：Cylinder 50, the round platform positioned at the cylinder two ends cut out the round platform on inclined-plane and are located at the round platform two ends
Flat board；
Step C：Base 5 in the middle of the preforming is placed on the lower mould 3 of marine diesel crank bending forging tools；
Step D：The mold 1 that forging tools is bent using marine diesel crank is pressed on base 5 in the middle of the preforming
On, forging molding is carried out to base in the middle of the preforming, the forging 58 after bend-forging is formed.
Further,
Step C specifically includes step C1：Make the flat support on the V-arrangement opening, the two ends of the flat board are stretched out
The V-arrangement opening, makes the V-arrangement opening contain the cylinder and round platform, so that primary deformable can be carried out in mould.
Further,
Step D specifically includes step D1：The mold bottom surface 10 is made to be pressed on the arc surface of the cylinder 50, can
Stress concentration or other deformation defects that root of cranking arm in reducing forging process occurs, forge to base 5 in the middle of the preforming
Type is caused, the forging 58 after bend-forging is formed.
The present invention improves the profile of base in the middle of preforming by adjusting marine diesel crank forging technology, and new
The design of mold and lower mould, solves the heat processing technique defect that crank is formed during forging and stamping bending process, improves material
Material utilization rate.
Schematically specific embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.For this
Each ingredient of invention can be mutually combined under conditions of not conflicting, any those skilled in the art, without departing from this
On the premise of the design of invention and principle, done equivalent variations and modification, all should belong to the scope of protection of the invention.
Claims (10)
1. a kind of marine diesel crank bends forging tools, for by forging molding, it is characterised in that the marine diesel
Crank bending forging tools includes：
The lower mould of the forging, the lower mould is supported to have：Lower mould bottom surface, lower mould first side and lower mould second
Side, the lower mould first side and lower mould second side are both connected on the lower mould bottom surface；The lower mould
V-arrangement opening is formed between first side and lower mould second side, the V-arrangement opening forms the forming cavity of the forging forging；
The mold being pushed against on the forging, the mold are V-type anvil, and the V-type anvil includes：Mold bottom surface and
Circumference is connected to the mold first side on the mold bottom surface, mold second side, the 3rd side of mold successively
The 4th side of face and mold, the mold first side and the 3rd side of mold form v-angle；The mold
Two side faces and the 4th side of mold are parallel to each other；The mold first side and mold second side meet at right angle；
Wherein, the mold first side is facing with lower mould first side, the 3rd side of the mold and lower mould
Second side is facing, and the mold bottom surface is the circular arc that in the vertical direction is recessed upwards.
2. marine diesel crank as claimed in claim 1 bends forging tools, it is characterised in that the V-type folder of the V-type anvil
Angle of the angle more than the V-arrangement opening.
3. marine diesel crank as claimed in claim 1 bends forging tools, it is characterised in that the V-type folder of the V-type anvil
Angle is 25 degree to 28 degree.
4. marine diesel crank as claimed in claim 1 bends forging tools, it is characterised in that the folder of the V-arrangement opening
Angle is 14 degree to 16 degree.
5. a kind of described marine diesel crank bends forging method, it is characterised in that described marine diesel crank bend
Bent forging method is comprised the following steps：
Step A：Ingot casting to molding carries out heating, upset, pulling and rounding, and ingot casting is forged into the forging of cylindrical shape；
Step B：Pressing forging is carried out to the two ends of cylindrical shape forging, is made the two ends of forging form flat board, is made the centre of forging
Position is forged into the shape that cylinder adds round platform；Whole forging is made to form base in the middle of preforming, base includes in the middle of the preforming：Circle
Post, the round platform positioned at the cylinder two ends and the flat board positioned at the round platform two ends；
Step C：Base in the middle of the preforming is placed on into marine diesel crank bending forging tools as claimed in claim 1
Lower mould on；
Step D：The mold that forging tools is bent using marine diesel crank as claimed in claim 1 is pressed on described pre-
In the middle of molding on base, forging molding is carried out to base in the middle of the preforming.
6. marine diesel crank as claimed in claim 5 bends forging method, it is characterised in that
Step C specifically includes step C1：Make the flat support on the V-arrangement opening, the V is stretched out at the two ends of the flat board
Shape opening, makes the V-arrangement opening contain the cylinder and round platform.
7. marine diesel crank as claimed in claim 5 bends forging method, it is characterised in that
Step D specifically includes step D1：The mold bottom surface is made to be pressed on the arc surface of the cylinder, to the preforming
Middle base carries out forging molding.
8. marine diesel crank as claimed in claim 5 bends forging method, it is characterised in that the v-angle of the V-type anvil
More than the angle of the V-arrangement opening.
9. marine diesel crank as claimed in claim 5 bends forging method, it is characterised in that the v-angle of the V-type anvil
For 25 degree to 28 degree.
10. marine diesel crank as claimed in claim 5 bends forging method, it is characterised in that the angle of the V-arrangement opening
For 14 degree to 16 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611188202.9A CN106583620A (en) | 2016-12-21 | 2016-12-21 | marine diesel engine crank bending forging tool and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611188202.9A CN106583620A (en) | 2016-12-21 | 2016-12-21 | marine diesel engine crank bending forging tool and method |
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| Publication Number | Publication Date |
|---|---|
| CN106583620A true CN106583620A (en) | 2017-04-26 |
Family
ID=58602124
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611188202.9A Pending CN106583620A (en) | 2016-12-21 | 2016-12-21 | marine diesel engine crank bending forging tool and method |
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| Country | Link |
|---|---|
| CN (1) | CN106583620A (en) |
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| CN107335769A (en) * | 2017-07-24 | 2017-11-10 | 山东南山铝业股份有限公司 | Frame forges component and method |
| CN109622842A (en) * | 2018-12-11 | 2019-04-16 | 陕西宏远航空锻造有限责任公司 | A kind of forging method and device of stock forging control die forging warpage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107335769A (en) * | 2017-07-24 | 2017-11-10 | 山东南山铝业股份有限公司 | Frame forges component and method |
| CN107335769B (en) * | 2017-07-24 | 2023-08-15 | 山东南山铝业股份有限公司 | Frame forging assembly and method |
| CN109622842A (en) * | 2018-12-11 | 2019-04-16 | 陕西宏远航空锻造有限责任公司 | A kind of forging method and device of stock forging control die forging warpage |
| CN109622842B (en) * | 2018-12-11 | 2021-04-20 | 陕西宏远航空锻造有限责任公司 | Forging method and device for controlling die forging warping of long-rod forge piece |
| CN113926973A (en) * | 2021-10-28 | 2022-01-14 | 中聚信海洋工程装备有限公司 | Combined anvil die and process for forging large crank throw |
| CN113926973B (en) * | 2021-10-28 | 2023-07-21 | 中聚信海洋工程装备有限公司 | Combined anvil die and process for forging large-scale crank throw |
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