CN106583620A - Crank bending forging tool and method of marine diesel engine - Google Patents

Crank bending forging tool and method of marine diesel engine Download PDF

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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
Authority
CN
China
Prior art keywords
forging
mold
mould
marine diesel
crank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201611188202.9A
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Chinese (zh)
Inventor
白冰
李耀军
韩庆礼
张俊彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MCC Capital Engineering and Research Incorporation Ltd
Zhongye Jingcheng Engineering Technology Co Ltd
Original Assignee
Zhongye Jingcheng Engineering Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhongye Jingcheng Engineering Technology Co Ltd filed Critical Zhongye Jingcheng Engineering Technology Co Ltd
Priority to CN201611188202.9A priority Critical patent/CN106583620A/en
Publication of CN106583620A publication Critical patent/CN106583620A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/04Shaping in the rough solely by forging or pressing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00Details of machines for forging, pressing, or hammering
    • B21J13/02Dies or mountings therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00Details of machines for forging, pressing, or hammering
    • B21J13/06Hammers tups; Anvils; Anvil blocks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21JFORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/02Die forging; Trimming by making use of special dies ; Punching during forging

Abstract

The invention provides a crank bending forging tool and method of a marine diesel engine. The crank bending forging tool of the marine diesel engine comprises a lower die and an upper die, wherein the lower die is used for supporting a forging and is provided with a V-shaped opening which forms a forming chamber used for forging the forging; the upper die which is a V-shaped anvil is propped to the forging; the first side surface of the upper die faces the first side surface of the lower die; the third side surface of the upper die faces the second side surface of the lower die; the bottom surface of the upper die is in a shape of a circular arc which is vertically upwards sunken. The crank bending forging method of the marine diesel engine is performed through the crank bending forging tool of the marine diesel engine. With the adoption of the crank bending forging tool and method of the marine diesel engine, the hot processing defects of a crank in a forging bending technology can be solved, and the material utilization rate can be improved.

Description

Marine diesel crank bends forging tools and method
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.
CN201611188202.9A 2016-12-21 2016-12-21 Crank bending forging tool and method of marine diesel engine Pending CN106583620A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611188202.9A CN106583620A (en) 2016-12-21 2016-12-21 Crank bending forging tool and method of marine diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611188202.9A CN106583620A (en) 2016-12-21 2016-12-21 Crank bending forging tool and method of marine diesel engine

Publications (1)

Publication Number Publication Date
CN106583620A true CN106583620A (en) 2017-04-26

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CN201611188202.9A Pending CN106583620A (en) 2016-12-21 2016-12-21 Crank bending forging tool and method of marine diesel engine

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Publication number Priority date Publication date Assignee Title
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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CN102189212A (en) * 2011-03-15 2011-09-21 燕山大学 Large-scale crank shaft bending forging die
CN202490909U (en) * 2011-12-31 2012-10-17 武汉重工铸锻有限责任公司 Bending die-forging finishing mold for crank blank of low-speed diesel engine
CN204842824U (en) * 2015-07-17 2015-12-09 重庆众诚精密模锻有限公司 Crank pre forging die
CN206276860U (en) * 2016-12-21 2017-06-27 中冶京诚工程技术有限公司 Marine diesel crank bends forging tools

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Publication number Priority date Publication date Assignee Title
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

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Application publication date: 20170426