CN106001380B - The manufacturing method of crankshaft - Google Patents
The manufacturing method of crankshaft Download PDFInfo
- Publication number
- CN106001380B CN106001380B CN201610119575.4A CN201610119575A CN106001380B CN 106001380 B CN106001380 B CN 106001380B CN 201610119575 A CN201610119575 A CN 201610119575A CN 106001380 B CN106001380 B CN 106001380B
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- mold
- lower die
- forming
- pin
- crankshaft
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- 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
- B21K1/00—Making machine elements
- B21K1/06—Making machine elements axles or shafts
- B21K1/08—Making machine elements axles or shafts crankshafts
-
- 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
- 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)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The present invention provides a kind of manufacturing method of crankshaft, is the manufacturing method for the in-line three-cylinder engine crankshaft that can be easily positioned material in each process and be able to suppress decrease in yield.It is characterized in that, lower die (210) as roughing mold for forming (200), using following such lower die (210): being located at has inclined surface (S) with the bottom surface of the slot (221) on the direction of the 2nd pin forming part (214) axially intersected, the generation for the flash (931) which inhibits material (920) to constitute from slot (221) along the die joint outflow of roughing mold for forming (200).In roughing molding procedure, engage each flash being formed on material (910) in roller-compaction process with the slot (221) of the lower die (210) of roughing mold for forming (200) respectively, positions molding material (920) in roller-compaction process relative to the lower die (210) of roughing mold for forming (200).
Description
Technical field
The present invention relates to a kind of manufacturing methods of crankshaft.
Background technique
A kind of previous known manufacturing method (such as patent document 1) of in-line three-cylinder engine crankshaft.In-line three cylinders hair
The 1st of the crankshaft of motivation is sold, the 2nd pin and the 3rd pin are since explosion is spaced, and configures the week in axle journal central spindle with 120 degree of interval
Upwards.In this way, the crankshaft for in-line three-cylinder engine is complex-shaped, in the case where passing through hot-forging forming crankshaft, it is difficult to make
The crankshaft for completing shape is directly demoulded from mold.Therefore, in the molding die using the shape for being shaped to be easy demoulding to material
Material carry out forging molding after, implement distortion processing, the distortion processing be centered on the axle center of journal shaft, respectively to clockwise and
Angle, such as 60 ° as defined in counterclockwise reversing every time.
In forging molding, the case where being formed without distortion processing to the crankshaft of in-line three-cylinder engine
Under, due to the phase of the 1st pin, the 2nd pin and the 3rd pin, difference of height (such as patent document 2) is generated in the division position of mold.
In addition, known one kind forms inclination rank on mold as the flash generated in forging molding to be inhibited less technology
The technology (such as patent document 3) in poor face.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2012-86265 bulletin
Patent document 2: Japanese Unexamined Patent Application 58-132342 bulletin
Patent document 3: Japanese Patent Publication 62-45009 bulletin
Summary of the invention
Problems to be solved by the invention
In forging molding, the case where being formed without distortion processing to the crankshaft of in-line three-cylinder engine
Under, as previously mentioned, generating difference of height in the division position of mold.Therefore, implement roller-compaction process in forging molding, slightly add
When work molding procedure and finishing molding procedure, material must be carried out when material is sent to next process from each process
Positioning relative to mold.For the positioning, it is necessary to be coped with to the flash setting scale etc. generated in each process of forging.
But in this case, due to that energetically flash must be made to generate, it may occur that a problem that decrease in yield.
The purpose of the present invention is to provide a kind of manufacturing method of crankshaft, the manufacturing method of the crankshaft can be in each process
It is easily positioned material, and is able to suppress decrease in yield.
Means for solving the problems
In order to achieve the above object, the present invention provides a kind of manufacturing method of crankshaft, in the manufacturing method of the crankshaft into
Row has roller-compaction process, roughing molding procedure and the hot forging for finishing molding procedure, the manufacturing method of the crankshaft
It is characterized in that, in the roller-compaction process, by cylindrical billet (such as aftermentioned billet (material) 910) conduct
Raw material (such as aftermentioned are rolled using the roller-compaction mold with lower die (such as aftermentioned lower die 110) and upper mold
Mold for forming 100), according to the shape of each crankshaft, the billet as material is made to be shaped to be similar to the finished form of crankshaft
Shape, in the roughing molding procedure, using the roughing with lower die (such as aftermentioned lower die 210) and upper mold at
Type makes in the roller-compaction process molding material (after such as with mold (such as aftermentioned roughing mold for forming 200)
The material 920 stated) it is shaped to more be similar to the shape of the finished form of crankshaft, in the finishing molding procedure, use
Finishing mold for forming (such as aftermentioned finishing forming mould with lower die (such as aftermentioned lower die 310) and upper mold
300) tool, makes molding material in the roughing molding procedure be shaped to the finished form with the crankshaft of machining allowance, make
For the lower die of the roller-compaction mold, the lower die of the roughing mold for forming, the finishing mold for forming
Lower die, using following such lower die: in the vertical direction, carrying out molding journal shaft forming part in the journal shaft to crankshaft
The lower section of (such as aftermentioned journal shaft forming part 112,212) is arranged with and carries out molding 2nd pin molding to the 2nd pin of crankshaft
It is (such as aftermentioned to be formed with the slot being connected to the 2nd pin forming part for portion (such as aftermentioned 2nd pin forming part 114,214)
Dovetail groove 121,221), the slot is recessed to vertical lower section, and uses along the roller-compaction mold, roughing molding
Each die joint (such as aftermentioned die joint 111,211) of mold and the finishing mold for forming extends, the slot
At least formed with a pair, the flash (such as aftermentioned flash 931) with the 2nd pin connection of crankshaft is generated in the slot, as
The lower die of the roughing mold for forming, using following such lower die: intersecting positioned at the axial direction of the 2nd pin forming part
Direction on the bottom surface of the slot there is inclined surface (such as aftermentioned inclined surface S), the inclined surface inhibits material from described
Slot is flowed out along the die joint of the roughing mold for forming and the generation of the flash of composition, in the roughing molding procedure
In, make each institute being formed in the slot of the lower die of roller-compaction mold on material in the roller-compaction process
It states flash to engage with the slot of the lower die of the roughing mold for forming respectively, make molding in the roller-compaction process
Material is positioned relative to the lower die of the roughing mold for forming.
It according to the present invention, can be relative to the lower die of roughing mold for forming by supporting flash by least a pair of of slot
Locator material, so as to the steadily supporting material in the lower die of roughing mold for forming.In addition, can using inclined surface
The generation for the flash for inhibiting material to constitute from slot outflow.Therefore, it is able to suppress decrease in yield.In addition, only in a pair of of slot
Upper formation inclined surface, in the case where other parts do not form inclined surface, load when being able to suppress forging becomes larger.In addition,
In the case where forming inclined surface on the slot being connected to the 2nd pin forming part, it is able to suppress and matches when the arm adjacent with the 2nd pin is not provided with
The generation of flash becomes more situations when weight.It is stretched out therefore, because being able to suppress flash from roughing molding die, it is thus possible to make
Mold for other processes is adjacent to configuration, further, it is possible to inhibit the phenomenon that flash causes obstacle whens forged article transmission etc..This
Outside, it is able to suppress the generation of flash, it correspondingly can be efficiently and easily in the intracavitary packing material of mold.
Also, in the roller-compaction process, as the lower die of the roller-compaction mold, using following such
Lower die (such as aftermentioned lower die 110): it is being formed by the 1st pin forming part (such as aftermentioned 1st pin forming part 113) with arm
In the region that portion's (such as aftermentioned arm forming part 116) surrounds have the 1st roll mold flat surface (such as it is aftermentioned 1st grind
Compression mould flat surface 124), the 1st pin forming part forms the 1st pin of crankshaft, and the arm forming part is to crankshaft
Adjacent arm is formed with the 1st pin, is being formed by the 3rd pin forming part (such as aftermentioned 3rd pin forming part 115) with arm
In the region that portion's (such as aftermentioned arm forming part 118) surrounds have the 3rd roll mold flat surface (such as it is aftermentioned 3rd grind
Compression mould flat surface 125), the 3rd pin forming part forms the 3rd pin of crankshaft, and the arm forming part is to crankshaft
Adjacent arm is formed with the 3rd pin, in the roughing molding procedure, as under the roughing mold for forming
Mould, using following such lower die 210: being formed by the 1st pin forming part (such as aftermentioned 1st pin forming part 213) with arm
There is the 1st preform moulds flat surface the (such as the aftermentioned 1st in the region that portion's (such as aftermentioned arm forming part 216) surrounds
Preform moulds flat surface 224), the 1st pin forming part forms the 1st pin of crankshaft, and the arm forming part is to song
The arm adjacent with the 1st pin of axis is formed, by the 3rd pin forming part (such as aftermentioned 3rd pin forming part 215) and arm
Have the 3rd preform moulds flat surface (after such as in the region that portion's forming part (such as aftermentioned arm forming part 218) surrounds
The 3rd preform moulds flat surface 225 stated), the 3rd pin forming part forms the 3rd pin of crankshaft, the arm molding
Portion's arm adjacent with the 3rd pin to crankshaft forms, from the die joint of the lower die of the roller-compaction mold to described
1st rolls the die joint of the depth of mold flat surface and the lower die from the roughing mold for forming to the 1st roughing
The depth of mold flat surface is identical, and it is flat to roll mold from the die joint of the lower die of the roller-compaction mold to the described 3rd
The die joint of the depth in face and lower die from the roughing mold for forming to the 3rd preform moulds flat surface depth
It is identical.
Thus in roller-compaction process, mold flat surface and the 3rd can be rolled the 1st and roll and load on mold flat surface
As the billet of material, therefore, cylindrical base can be made with the probably consistent positional relationship in the axle center with journal shaft forming part
Ingot configures in roller-compaction mold.Therefore, the axle center of cylindrical billet is able to suppress relative to journal shaft forming part
Axle center becomes decrease in yield caused by inclined positional relationship.
In addition, the flash of material is by a pair of of slot of the lower die of roughing mold for forming point in roughing molding procedure
It does not support, at the same time, the 1st preform moulds flat surface bearing surface of material, the 3rd preform moulds flat surface bearing surface difference
By the 1st preform moulds flat surface, the 3rd flat surface bearing of preform moulds.That is, being capable of being total to using roughing mold for forming
Count four part supporting materials.Therefore, the lower die locator material loosely relative to roughing mold for forming can not be generated,
So as to the steadily supporting material in the lower die of roughing mold for forming.
Also, in the finishing molding procedure, as it is described finishing mold for forming lower die, using it is following this
The lower die (such as aftermentioned lower die 310) of sample: by the 1st pin forming part (such as aftermentioned 1st pin forming part 313) and arm
There is the 1st material supporting part (such as aftermentioned 1st material in the region that forming part (such as aftermentioned arm forming part 316) surrounds
Expect supporting part 324), the 1st pin forming part forms the 1st of crankshaft pin, and the arm forming part is to crankshaft and the 1st
The arm for selling adjacent is formed, what is surrounded by the 3rd pin forming part (such as aftermentioned 3rd pin forming part) with arm forming part
There is the 3rd material supporting part, the 3rd pin forming part forms the 3rd pin of crankshaft, the arm forming part pair in region
Crankshaft is formed with the 3rd adjacent arm of pin, from the die joint of the lower die of the finishing mold for forming to the described 1st
The depth of material supporting part and the die joint of the lower die from the roughing mold for forming are flat to the 1st preform moulds
The depth in face is identical, from it is described finishing mold for forming lower die die joint to the 3rd material supporting part depth with
Depth from die joint to the 3rd preform moulds flat surface of the lower die of the roughing mold for forming is identical.
Thus in finishing molding procedure, the flash of material is finish-machined at least a pair of of slot of the lower die of type mold
It supports respectively, at the same time, the 1st material supporting part bearing surface of material, the 3rd material supporting part bearing surface are respectively by the 1st material
The protrusion end face of supporting part, the 3rd material supporting part protrusion end surface supporting.That is, being capable of being total to using finishing mold for forming
Count four part supporting materials.Therefore, the lower die locator material loosely relative to finishing mold for forming can not be generated,
So as to the steadily supporting material in the lower die of finishing mold for forming.
The effect of invention
In accordance with the invention it is possible to provide a kind of manufacturing method of crankshaft, the manufacturing method of the crankshaft can be in each process
It is easily positioned material, and is able to suppress decrease in yield.
Detailed description of the invention
Fig. 1 is used in the manufacturing method for show the in-line three-cylinder engine crankshaft of an embodiment of the invention
The top view of the lower die 110 of roller-compaction mold 100.
Fig. 2 is that the manufacturing method shown in the in-line three-cylinder engine crankshaft of an embodiment of the invention rolls
In molding procedure, what billet 910 was placed in the lower die 110 of roller-compaction mold 100 the 1st is rolled on mold flat surface 124
The enlarged cross-sectional view of state.
Fig. 3 is used in the manufacturing method for show the in-line three-cylinder engine crankshaft of an embodiment of the invention
The top view of the lower die 210 of roughing mold for forming 200.
Fig. 4 be show the in-line three-cylinder engine crankshaft of an embodiment of the invention manufacturing method thick plus
In work molding procedure, material 920 is placed in the 1st preform moulds flat surface of the lower die 210 of roughing mold for forming 200
The enlarged cross-sectional view of state on 224.
Fig. 5 is used in the manufacturing method for show the in-line three-cylinder engine crankshaft of an embodiment of the invention
The enlarged cross-sectional view of the inclined surface S of roughing mold for forming 200.
Fig. 6 is used in the manufacturing method for show the in-line three-cylinder engine crankshaft of an embodiment of the invention
The lower die 210 of roughing mold for forming 200 and the top view of material.
Fig. 7 is the cross-sectional view of the line B-B along Fig. 6.
Fig. 8 is the cross-sectional view of the line A-A along Fig. 6.
Fig. 9 is the cross-sectional view of the line C-C along Fig. 6.
Figure 10 is the essence shown in the manufacturing method of the in-line three-cylinder engine crankshaft of an embodiment of the invention
In machine-shaping process, material 930 is placed on the 1st material supporting part 324 of the lower die 310 of finishing mold for forming 300
State enlarged cross-sectional view.
Label declaration
100: roller-compaction mold；
110: lower die；
111,211: die joint；
112,212: journal shaft forming part；
113: the 1 pin forming parts；
114,214: the 2 pin forming part；
115: the 3 pin forming parts；
116: arm forming part；
118: arm forming part；
121,221: dovetail groove (slot)；
125: the 3 roll mold flat surface；
200: roughing mold for forming；
210: lower die；
213: the 1 pin forming parts；
215: the 3 pin forming parts；
216: arm forming part；
218: arm forming part；
223: convex shaped part；
224: the 1 preform moulds flat surfaces；
225: the 3 preform moulds flat surfaces；
300: finishing mold for forming；
310: lower die；
313: the 1 pin forming parts；
316: arm forming part；
324: the 1 material supporting parts；
910: billet (material)；
920: material；
931: flash.
Specific embodiment
An embodiment of the invention is directed at while referring to attached drawing to be described in detail.
Fig. 1 is used in the manufacturing method for show the in-line three-cylinder engine crankshaft of an embodiment of the invention
The top view of the lower die 110 of roller-compaction mold 100.Fig. 2 is three cylinder of array shown in an embodiment of the invention
In the roller-compaction process of the manufacturing method of engine crankshaft, billet 910 is placed in the lower die of roller-compaction mold 100
The 1st of 110 rolls the enlarged cross-sectional view of the state on mold flat surface 124.Fig. 3 shows an embodiment of the invention
The top view of the lower die 210 of the roughing mold for forming 200 used in the manufacturing method of in-line three-cylinder engine crankshaft.
Fig. 4 be show the in-line three-cylinder engine crankshaft of an embodiment of the invention manufacturing method thick plus
In work molding procedure, material 920 is placed in the 1st preform moulds flat surface of the lower die 210 of roughing mold for forming 200
The enlarged cross-sectional view of state on 224.Fig. 5 is the in-line three-cylinder engine crankshaft for showing an embodiment of the invention
The enlarged cross-sectional view of the inclined surface S of the roughing mold for forming 200 used in manufacturing method.Fig. 6 is to show of the invention one
The lower die of the roughing mold for forming 200 used in the manufacturing method of the in-line three-cylinder engine crankshaft of a embodiment
210 and material top view.Fig. 7 is the cross-sectional view of the line B-B along Fig. 6.Fig. 8 is the cross-sectional view of the line A-A along Fig. 6.Fig. 9 is edge
The cross-sectional view of the line C-C of Fig. 6.Figure 10 is the system shown in the in-line three-cylinder engine crankshaft of an embodiment of the invention
It makes in the finishing molding procedure of method, material 930 is placed in the 1st material branch of the lower die 310 of finishing mold for forming 300
The enlarged cross-sectional view of state in bearing portion 324.
The crankshaft forged using the manufacturing method of the in-line three-cylinder engine crankshaft of present embodiment is in automobile etc.
In internal combustion engine (engine), the reciprocating motion of piston is collaboratively converted into rotary motion with connecting rod.Crankshaft is structured to directly
Column three-cylinder engine.
Crankshaft is hot-forged by what is carried out in the manufacturing method of the in-line three-cylinder engine crankshaft of present embodiment
Type.Hot forging has roller-compaction process, roughing molding procedure and finishing molding procedure.In roller-compaction process,
Using the roller-compaction mold 100 with lower die 110 and upper mold (not shown).In roughing molding procedure, use
Roughing mold for forming 200 with lower die 210 and upper mold 250.In finishing molding procedure, using has lower die
310 and upper mold (not shown) finishing mold for forming 300.
Firstly, being illustrated to the roller-compaction mold 100 used in roller-compaction process.Roller-compaction mold
100 according to the shape of each crankshaft, makes the cylindrical billet 910 as material (referring to the enlarged section of the line D-D along Fig. 1
Figure, i.e. Fig. 2) it is shaped to be similar to the shape of the finished form of crankshaft.
As shown in Figure 1, the lower die 110 of roller-compaction mold 100 has lower die die joint 111, journal shaft forming part
112, the 1st pin forming part the 113, the 2nd sells forming part the 114, the 3rd and sells forming part 115, arm forming part 116,117,118, counterweight
Portion's forming part 119, dovetail groove 121, convex shaped part the 122,123, the 1st roll mold flat surface 124 and the 3rd, and to roll mold flat
Face 125.
In roller-compaction process, when roller-compaction uses the lower die 110 of mold 100 and upper mold to clip the billet as material
910 when being formed, and a part of die joint 111 is abutted with the upper mold die joint of upper mold (not shown).Journal shaft forming part 112
It is (not shown) to part, the i.e. journal shaft in the cylinder block for being supported on engine in a manner of it can rotate in crankshaft carry out at
Type.Journal shaft forming part 112, which is formed as having in lower die 110, mutually closes across the position of compartment of terrain configuration on the same axis
System, so that multiple journal shafts have the positional relationship mutually across compartment of terrain configuration on the same axis.Each axle journal of lower die 110
Axis forming part 112 has generally cylindrical shaped with shape obtained from the section cutting containing its axle center, thus by lower die 110
Each journal shaft forming part 112 and upper mold (not shown) each journal shaft forming part form it is substantial cylindrical.
1st pin forming part the 113, the 2nd sells the pin forming part 115 of forming part the 114, the 3rd and is respectively configured to form in journal shaft
On the axis direction (left and right directions of Fig. 1) in portion 112, at the position of shaft core position for deviateing journal shaft forming part 112, respectively
Between multiple journal shaft forming parts 112.The 1st of the crankshaft connecting with the connecting rod of piston is set to sell in the 1st pin forming part 113
Molding.Similarly, the 2nd of the crankshaft connecting with the connecting rod of piston is made to sell molding in the 2nd pin forming part 114, in the 3rd pin molding
The 3rd of the crankshaft connecting with the connecting rod of piston is set to sell molding in portion 115.
2nd pin forming part 114 configures in the vertical direction carries out molding journal shaft forming part in the journal shaft to crankshaft
112 lower section.Specifically, the 2nd sells forming part 114 between journal shaft forming part 112 and journal shaft forming part 112, from tool
Have and is recessed with the shaft core position of the journal shaft forming part 112 of the consistent positional relationship of die joint 111 to vertical lower section and is formed.
In contrast, the 1st pin forming part 113 is formed to have following positional relationship: when from journal shaft forming part 112
(with from figure when the extending direction in axle center just looks at the direction observation that the 1st pin forming part 113 to the 2 sells forming part 114 by front up
When the direction observation of 1 from left to right), the 1st pin forming part 113 is centered on the axle center of journal shaft forming part 112, relative to the
2 pin forming parts 114 are counterclockwise along 120 ° of circumferential offset of the phase in the axle center of journal shaft forming part 112.Therefore, under
In 1st pin forming part 113 of mould 110, seldom a part of the 1st pin is only molded, the major part of the 1st pin is upper mold (not shown)
The 1st pin forming part in form.
Similarly, the 3rd pin forming part 115 is formed to have following positional relationship: when from the axle center of journal shaft forming part 112
Extending direction just look at up the 1st pin forming part 113 to the 2 sell forming part 114 by front direction observation when (from Fig. 1's
When the direction observation of from left to right), the 3rd pin forming part 115 is centered on the axle center of journal shaft forming part 112, relative to the 2nd pin
Forming part 114 is clockwise along 120 ° of circumferential offset of the phase in the axle center of journal shaft forming part 112.Therefore, in lower die
In 110 the 3rd pin forming part 115, seldom a part of the 3rd pin is only molded, the major part of the 3rd pin is in upper mold (not shown)
It is formed in 3rd pin forming part.
116,117,118 pairs of arm forming part respectively with the 1st of crankshaft pin, the 2nd pin, the 3rd integrally formed arm of pin into
Row molding.Arm forming part 116,117,118 is connected on the axis direction (left and right directions of Fig. 1) of journal shaft forming part 112
1st pin forming part the 113, the 2nd sells each end and journal shaft forming part 112 that forming part the 114, the 3rd sells forming part 115, so that
Arm prolongs to journal shaft a pair to the approximately axially orthogonal direction of journal shaft from the 1st pin, the 2nd pin, the 3rd pin over the ground respectively
It stretches and is integrally formed with journal shaft.
Counterweight part forming part 119 forms counterweight part, and the counterweight part is from journal shaft along substantially orthogonal with journal shaft
Direction from the 1st pin, the 3rd direction left of pin towards plate-like extending respectively.Counterweight forming part 119 be formed as respectively with arm at
Type portion 116,118 is connected to and width is wider than arm forming part 116,118, so that counterweight part and arm are integrally formed and are shaped to width
Degree is wider than the plate of arm.Arm forming part 116,118 is formed in pairs, arm forming part 116,118 in pairs formed so that
It is formed over the ground with the integrally formed counterweight part of each arm also a pair respectively.In addition, selling not integrated on integrally formed arm with the 2nd
Form counterweight part.Therefore, the not formed counterweight part forming part being connected to arm forming part 117.
Dovetail groove 121 has following such trapezoidal shape: the section orthogonal with the length direction of dovetail groove 121 is with connecing
Nearly slot bottom and be tapered (referring to the roughing mold for forming 200 roughly the same with 121 shape of dovetail groove shown in Fig. 9
The dovetail groove 221 of lower die 210).Dovetail groove 121 is recessed to forming direction, that is, vertical lower section, and along roller-compaction mold 100
Die joint 111 to the direction orthogonal with the axis direction of journal shaft forming part 112, i.e. to the up and down direction of Fig. 1 to divide each other
From mode extend in couples.The base end part of dovetail groove 121 is connected to the 2nd pin forming part 114.Dovetail groove 121 is along parting
Projecting end on the direction in face 111 is located at the edge of lower die 110.When the billet 910 as material passes through roller-compaction mould
When 100 molding of tool, a part of material enters dovetail groove 121.The flash with the 2nd pin connection of crankshaft is generated as a result,.Enter ladder
A part of material of shape slot 121 becomes a part of flash.
Convex shaped part 122,123 is prominent to vertical top, and along the die joint 111 of roller-compaction mold 100 to axis
The orthogonal direction of the axis direction of neck axis forming part 112 extends to the lower section of Fig. 1, top in couples respectively.To under Fig. 1
The base end part of the convex shaped part 122 of Fang Yanshen is connected to the 1st pin forming part 113, and convex shaped part 122 is in the direction along die joint 111
On projecting end be located at lower die 110 Fig. 1 downside edge.To the top of Fig. 1 extend convex shaped part 123 base end part with
3rd pin forming part 115 is connected to, and projecting end of the convex shaped part 123 on the direction along die joint 111 is located at the figure of lower die 110
The edge of 1 upside.Therefore, as shown in Fig. 2, in the section of the lower die 110 orthogonal with the axle center of journal shaft forming part 112,
Downward inclination is formd from convex shaped part 122 to the 1st pin forming part 113.
Also, in top view shown in Fig. 1, the 1st pin forming part 113 by being located in inclination, selling with the 1st to crankshaft
Adjacent pair arm carries out molding a pair of of arm forming part 116 and is connected to and with a pair of of arm forming part 116 to one
Carry out the part in the region for the lower die 110 that molding a pair of of counterweight part forming part 119 surrounds to counterweight part, i.e., it is shown in Fig. 2 from
The part for terminating the left side that the part tilted down is risen has the 1st to roll mold flat surface 124.1st rolls mold flat surface
124 in roller-compaction process, and formation is made of flat surface on as the material part from the 1st pin to the part of counterweight part
1st preform moulds flat surface bearing surface 921 (referring to Fig. 4).
Similarly about the convex shaped part 123 being connected with the 3rd pin forming part 115, as shown in Figure 1, by the 3rd pin forming part
115, to crankshaft and the 3rd pin adjacent pair arm carry out molding a pair of of arm forming part 118 and with a pair of of arm at
Type portion 118 is connected to and carries out to a pair of of counterweight part the portion in the region for the lower die 110 that molding a pair of of counterweight part forming part 119 surrounds
Dividing has the 3rd to roll mold flat surface 125.3rd rolls mold flat surface 125 in roller-compaction process, with from the 3rd pin to
The 3rd preform moulds flat surface bearing surface being made of flat surface is formed in the comparable material part in the part of counterweight part (not scheme
Show).
Journal shaft forming part the 112, the 1st sells forming part the 113, the 2nd and sells the pin of forming part the 114, the 3rd forming part 115, arm molding
Portion 116,117,118, counterweight part forming part the 119, the 1st roll mold flat surface 124 and the 3rd and roll 125 structure of mold flat surface
At a part of chamber, which molds the portion as crankshaft in roller-compaction process from the billet 910 as material
Point.
In addition, the part of the upper mold (not shown) of roller-compaction mold 100, i.e. in roller-compaction process from material at
The part being located in upper mold that type goes out to become the chamber of the part of crankshaft is constituted are as follows: to crankshaft molding one in lower die 110
Part except part is formed.That is, upper mold is (not shown) to have axis same as the journal shaft forming part 112 of lower die 110
Neck axis forming part.In addition, upper mold is (not shown) to have upper mold die joint that is opposite with lower die die joint 111 and abutting.On moreover,
Mold has the 1st pin forming part, the 3rd pin forming part, arm forming part and counterweight part forming part (not shown), they are not under
Part, the part of arm and the part of counterweight part of part, the 3rd pin that mould 110 the molding 1st is sold are formed.
In addition, upper mold is formed with trapezoidal protrusion and concave groove, the trapezoidal protrusion and the dovetail groove formed in lower die 110
121 engagings, and there is the shape more smaller than dovetail groove 121, the concave groove is blocked with the convex shaped part 122 formed in lower die 110
It closes, and more bigger than convex shaped part 122.
Then, the roughing mold for forming 200 used in roughing molding procedure is illustrated.Roughing molding is used
Mold 200 makes molding material 920 in roller-compaction process be shaped to the shape of the shape closer to the crankshaft as finished product.
Therefore, the lower die 210 of roughing mold for forming 200 has lower die in the same manner as the lower die 110 of roller-compaction mold 100
Die joint 211, journal shaft forming part the 212, the 1st sell forming part the 213, the 2nd sell forming part the 214, the 3rd sell forming part 215, arm at
Type portion 216,217,218 and counterweight part forming part 219.These parts can be to be more similar to as each of the crankshaft of finished product
The shape of partial shape forms material.It omits about these roughly the same with the structure of roller-compaction mold 100
Partial explanation, below to the roughing mold for forming 200 different from the structure of roller-compaction mold 100 in addition to this
Characteristic structural be illustrated.
Shown in cross-sectional view such as Fig. 5, i.e. along the F-F line of Fig. 3, the dovetail groove of the lower die 210 of roughing mold for forming 200
221 bottom surface has inclined surface S.Inclined surface S is present in the bottom surface of dovetail groove 221, that is, is located at the axis with the 2nd pin forming part 214
To the bottom surface of the dovetail groove 221 in orthogonal direction (top, lower section in Fig. 3).Inclined surface S has the extension with dovetail groove 221
The orthogonal positional relationship in direction (above or below in Fig. 3), exists in a manner of traversing dovetail groove 221.Therefore, such as Fig. 5 institute
Show, is the bottom surface of the dovetail groove 221 on boundary, the side for being located remotely from the 2nd pin forming portion relative to being located adjacent to the using inclined surface S
The bottom surface of the dovetail groove 221 of the side of 2 pin forming portions, has the positional relationship for being higher by one section in the vertical direction.That is, to edge
Flash 931 (referring to Fig. 8) in dovetail groove 221 in the section of line A-A shown in fig. 6 and along the section of line B-B shown in fig. 6
In dovetail groove 221 in flash 931 (referring to Fig. 7) be compared, then be configured to dovetail groove 221 bottom formed flash
The position of 931 height is different.
The dovetail groove 221 of the lower die 210 of roughing mold for forming 200, be equivalent to the part of trapezoidal a pair of of bevel edge
220 (referring to Fig. 8 etc.), use relative to the inclination angle of vertical direction (up and down direction of Fig. 8) and with its comparable roller-compaction
The dovetail groove 121 of the lower die 110 of mold 100, the part (not shown) that is equivalent to two trapezoidal bevel edges, relative to vertical
The inclination angle in direction is identical.
In addition, as shown in figure 5, engage with the dovetail groove 221 of the lower die 210 of roughing mold for forming 200, roughing
The lower end of the trapezoidal protrusion of the upper mold (not shown) of mold for forming 200 has 221 He of dovetail groove similar to lower die 210
The shape of inclined surface S.Inclined surface S inhibits the flash in roughing molding procedure to generate and from dovetail groove 221 along die joint 211
The flash diffusion flowed out and spread, inhibits the generation of flash.
As shown in figure 3, the convex shaped part 222,223 of the lower die 210 of roughing mold for forming 200 and roller-compaction mold
The convex shaped part 122,123 of 100 lower die 110 is similarly, prominent to vertical top, and along roughing mold for forming 200
Die joint 211 is each extended over to the direction orthogonal with the axis direction of journal shaft forming part, i.e. to the lower section of Fig. 3, top.Xiang Tu
The base end part for the convex shaped part 222 that 1 lower section extends is sold forming part 213 with the 1st and is connected to, convex shaped part 222 along die joint 211
Projecting end be located at lower die 210 Fig. 3 downside edge.The base end part and the of the convex shaped part 223 extended to the top of Fig. 3
3 pin forming parts 215 are connected to, and the projecting end along die joint 211 of convex shaped part 223 is located at the edge of the upside of Fig. 3 of lower die 210
Portion.Therefore, such as in the state of having loaded material 920 in the lower die 210 of roughing mold for forming 200, E-E along Fig. 6
Shown in amplification section, that is, Fig. 4 of line, in the section of the lower die 210 orthogonal with the axle center of journal shaft forming part 212, from convex shaped part
222 to the 1st pin forming parts 213 form downward inclination.
Also, in top view shown in Fig. 3, by the 1st pin forming part 213 being located in inclination and to crankshaft and the 1st
Pin adjacent pair arm carries out the region part for the lower die 210 that molding a pair of of arm forming part 216 surrounds, i.e., in lower die
The part in the left side in 210 from the part shown in Fig. 4 for terminating to tilt down has the 1st preform moulds flat surface 224.?
In forming direction, that is, vertical direction, rolled from the die joint 111 to the 1st of the lower die 110 of roller-compaction mold 100 above-mentioned
211 to the 1st preform moulds of die joint of the depth of mold flat surface 124 and the lower die 210 from roughing mold for forming 200
The depth of flat surface 224 is identical.
In addition, the dovetail groove 221 and the 1st preform moulds flat surface of the roughing mold for forming 200 in vertical direction
224 positional relationship and the dovetail groove 121 and the 1st of roller-compaction mold 100 roll the positional relationship of mold flat surface 124
It is identical.In roughing molding procedure, the 1st preform moulds flat surface bearing surface 921 and the 1st preform moulds flat surface 224
It is abutted by face, the 1st preform moulds flat surface bearing surface 921 is by the flat surface that is formed on material in roller-compaction process
It constitutes.Also, the 1st preform moulds flat surface 224 is sold with from the 1st to the part phase of arm in roughing molding procedure
When material part on form the 1st material supporting part bearing surface 932 (referring to Fig.1 0) that is made of flat surface.
Also, than the 1st preform moulds flat surface 224 more by the part of counterweight part forming part 219, ratio i.e. shown in Fig. 4
1st preform moulds flat surface 224, which is also formed with by the part in left side from what the 1st preform moulds flat surface 224 declined, to incline
Tiltedly, the part surrounded in the part that decline terminates, top view i.e. shown in Fig. 3 by counterweight part, is also formed with for counterweight
The a part in portion carries out molding flat surface 226.
About convex shaped part 223 that the part that tilts down is connected with the 3rd pin forming part 215 is terminated similarly, in Fig. 3
Shown in top view, carry out molding a pair with the 3rd pin adjacent pair arm by the 3rd pin forming part 215 and to crankshaft
The part in the region for the lower die 210 that arm forming part 218 surrounds has the 3rd preform moulds flat surface 225 (referring to Fig. 3).?
In forming direction, that is, vertical direction, rolled from the die joint 111 to the 3rd of the lower die 110 of roller-compaction mold 100 above-mentioned
211 to the 3rd roughing mould of die joint of the depth of mold flat surface 125 and the lower die 210 from roughing mold for forming 200
The depth for having flat surface 225 is identical.
In addition, the dovetail groove and the 3rd preform moulds flat surface 225 of the roughing mold for forming 200 in vertical direction
Positional relationship and the dovetail groove 121 of roller-compaction mold 100 with the 3rd to roll the positional relationship of mold flat surface 125 identical.
In roughing molding procedure, the 3rd preform moulds flat surface bearing surface (not shown) and the 3rd preform moulds flat surface 225
It is abutted by face, the 3rd preform moulds flat surface bearing surface is by the flat surface structure that is formed on material in roller-compaction process
At.Also, the 3rd preform moulds flat surface 225 is in roughing molding procedure, suitable to the part of arm with from the 3rd pin
Material part on form the 3rd material supporting part bearing surface (not shown) that is made of flat surface.
Also, more the part of counterweight part forming part 219 (lower section in Fig. 1) is leaned on also than the 3rd preform moulds flat surface 225
It is formed with the inclination declined from the 3rd preform moulds flat surface 225, the top view shown in the part that decline terminates, i.e. Fig. 3
In the part that is surrounded by counterweight part forming part 219, be also formed with and carry out molding flat surface for a part to counterweight part
227。
Then, the finishing mold for forming 300 used in finishing molding procedure is illustrated.Finishing molding is used
Mold 300 (referring to Fig.1 0) makes molding material in roughing molding procedure be shaped to the finished product shape with the crankshaft of machining allowance
Shape.Therefore, the lower die 310 of mold for forming 300 is finished in the same manner as the lower die 210 of roughing mold for forming 200, is had
Lower die die joint (not shown), journal shaft forming part (not shown), the 1st pin forming part the 313, the 2nd sell forming part (not shown),
3rd pin forming part (not shown), arm forming part 316 and counterweight part forming part 319, they have for molding more than processing
Each section of the crankshaft of amount.Thus, it omits about these parts roughly the same with the structure of roughing mold for forming 200
Illustrate, below to the spy of the finishing mold for forming 300 different from the structure of roughing mold for forming 200 in addition to this
Sign property structure is illustrated.
As shown in Figure 10, the convex shaped part 322 and roughing mold for forming of the lower die 310 of mold for forming 300 are finished
The convex shaped part 222 of 200 lower die 210 is similarly, prominent to vertical top respectively, and along finishing mold for forming 300
Parting extends towards the direction orthogonal with the axis direction of journal shaft forming part (not shown).Therefore, as shown in Figure 10, with axis
In the section of the orthogonal lower die 310 in the axle center of neck axis, forming part 313 is sold from convex shaped part 322 to the 1st and forms downward inclination.
Also, the by being located in inclination the 1st sells forming part 313 and carries out to crankshaft with the 1st pin adjacent pair arm
It (is sold with shown in Fig. 3 in roughing molding procedure by the 1st in the region for the lower die 310 that molding a pair of arm forming part 316 surrounds
Forming part 213 and the lower die that molding a pair of of arm forming part 216 surrounds is carried out to crankshaft and the 1st pin adjacent pair arm
The comparable region in 210 region) part, i.e., in lower die 310 from it is shown in Fig. 10 terminate the part that tilts down a left side
The part of side has flat surface.The 1st material supporting part 324 is formed in the end by counterweight part of the flat surface.Such as Figure 10 institute
Show, the 1st material supporting part 324 has generally trapezoidal shape in the section orthogonal with journal shaft forming part, and to vertical top
It is prominent.In forming direction, that is, vertical direction, from finishing mold for forming 300 lower die 310 die joint (not shown) extremely
The die joint 211 of the depth of the protrusion end face of 1st material supporting part 324 and lower die 210 from roughing mold for forming 200 to
The depth of 1st preform moulds flat surface 224 is identical.
In addition, the dovetail groove (not shown) and the 1st of the finishing mold for forming 300 in forming direction, that is, vertical direction
The positional relationship of the protrusion end face of material supporting part 324 and the dovetail groove 221 of roughing mold for forming 200 and the 1st roughing
The positional relationship of mold flat surface 224 is identical.1st material supporting part bearing surface 932 is connected to the prominent of the 1st material supporting part 324
Out on end face, the 1st material supporting part bearing surface 932 is made of the flat surface being formed on material in roughing molding procedure.
The dovetail groove 221 of the lower die 210 of roughing mold for forming 200, be equivalent to the part of two trapezoidal bevel edges
220 (referring to Fig. 8 etc.), relative to vertical direction (up and down direction of Fig. 8) inclination angle and with its comparable finishing molding
With the dovetail groove of the lower die 310 of mold 300, be equivalent to the part of two trapezoidal bevel edges, inclining relative to vertical direction
Oblique angle is identical.
In addition, comparing the shown in Fig. 10 in the part for more leaning on counterweight part forming part 319 than the 1st material supporting part 324
1 material supporting part 324 leans on the part in left side, is also formed with and carries out molding flat surface 325 for a part to counterweight part.
Next, to the mold 100 of roller-compaction using the above structure, roughing mold for forming 200 and finishing
The manufacturing method of the in-line three-cylinder engine crankshaft of work mold for forming 300 is illustrated.
It in the manufacturing method of in-line three-cylinder engine crankshaft, is hot-forged as previously described, hot forging has roller-compaction
Process, roughing molding procedure and finishing molding procedure, and be hot-forged in this order.
As shown in Fig. 2, regarding cylindrical billet 910 as raw material in roller-compaction process, being used using roller-compaction
Mold 100 (referring to Fig.1) makes the billet 910 as material be shaped to be similar to the finished product of crankshaft according to the shape of each crankshaft
The shape of shape.Specifically, firstly, in lower die 110, in the part for constituting a part of chamber, with the axle center of billet 910 with
Cylindrical billet 910 of the probably consistent positional relationship configuration in the axle center of journal shaft forming part 112 as material.At this point, such as
Shown in Fig. 2, billet 910 is placed in the 1st near the 1st pin forming part 113 and is rolled on mold flat surface 124.Similarly, base
Ingot 910 is placed in the 3rd near the 3rd pin forming part 115 and is rolled on mold flat surface 125.
It rolls mold flat surface 124 and the 3rd in this way, billet 910 is placed in the 1st and rolls on mold flat surface 125, because
This as material cylindrical billet 910 with the probably consistent position in axle center in the axle center of billet 910 and journal shaft forming part 112
Relationship is set steadily to be configured.In this state, make the die joint 111 of lower die 110 and the die joint of upper mold (not shown) mutual
It approaches and abuts, thus molded, in the chamber formed by lower die 110 and upper mold (not shown), cylindrical billet 910
It is shaped to be similar to the shape of the finished form of crankshaft.Mold is rolled at this point, being placed in the 1st and rolling mold flat surface the 124, the 3rd
The part of material on flat surface 125, which by the 1st rolls mold flat surface the 124, the 3rd and rolls mold flat surface 125, to be pressed.As a result,
It is abutted as shown in figure 4, being formed with the 1st preform moulds flat surface being made of respectively flat surface in these parts of material 920
Face 921, the 3rd preform moulds flat surface bearing surface (not shown).In addition, be formed in dovetail groove 121 trapezoidal flash (with
The same flash of trapezoidal flash in roughing molding procedure shown in Fig. 8).
Then, in roughing molding procedure, using roughing mold for forming 200, make to form in roller-compaction process
Material 920 be shaped to more be similar to the shape of the finished form of crankshaft.Specifically, firstly, by roller-compaction process
Molding material 920 is configured in the lower die 210 of roughing mold for forming 200 in the part for constituting a part of chamber.
At this point, such as show in the cross-sectional view of the line C-C of Fig. 6 in the lower die 210 of roughing mold for forming 200
Shown in the Fig. 9 for having loaded the state of material 920, make in roller-compaction process in the ladder of the lower die 110 of roller-compaction mold 100
Be formed in shape slot 121 the trapezoidal flash 931 of a pair on material respectively with the lower die 210 of roughing mold for forming 200
Dovetail groove 221 engages.At the same time, make to grind in roller-compaction process using the 1st of the lower die 110 of roller-compaction mold 100
It is thick that compression mould flat surface the 124, the 3rd rolls the molding 1st preform moulds flat surface bearing surface the 921, the 3rd of mold flat surface 125
Processing mold flat surface bearing surface (not shown) respectively with the 1st preform moulds flat surface 224, the 3rd preform moulds flat surface
225 abut.
That is, as shown in figure 9, in the dovetail groove 221 of the lower die 210 of roughing mold for forming 200, dovetail groove 221
It is equivalent in the part 220 and roller-compaction process of two trapezoidal bevel edges in the ladder of the lower die 110 of roller-compaction mold 100
The part that two bevel edges of the trapezoidal flash 931 on material are formed in shape slot 121 is abutted by face respectively, therefore, trapezoidal
Flash 931 reliably engage with dovetail groove 221, material 920 is steadily supported on the lower die of roughing mold for forming 200
210.In addition, the 1st preform moulds flat surface bearing surface 921, the 3rd preform moulds flat surface bearing surface (not shown) respectively with
1st preform moulds flat surface 224, the 3rd preform moulds flat surface 225 are abutted by face.Material is by a pair of of dovetail groove as a result,
221, this four parts of the 1st preform moulds flat surface 224 and the 3rd preform moulds flat surface 225 support, and will not generate
It loosens, the lower die 210 relative to roughing mold for forming 200 is positioned, and is used to be steadily supported on roughing molding
In the lower die 210 of mold 200.
In this state, make the die joint (not shown) of the die joint 211 of lower die 210 and upper mold 250 close to each other and support
It connects, to be molded, in the chamber formed by lower die 210 and upper mold 250, material 920 is shaped to more be similar to crankshaft
Finished form shape.At this point, being placed in the 1st preform moulds flat surface 224, on the 3rd preform moulds flat surface 225
The part of material is pressed by the 1st preform moulds flat surface 224, the 3rd preform moulds flat surface 225, is formed in these parts
There are the 1st material supporting part bearing surface 932, the 3rd material supporting part bearing surface (not shown) being made of respectively flat surface.In addition,
Fig. 7, trapezoidal flash as shown in Figure 8 are formed in the dovetail groove 221 of roughing mold for forming 200.At this point, due to
The inclined surface S (referring to Fig. 5) of the dovetail groove 221 of the lower die 210 of roughing mold for forming 200, simultaneously from the diffusion of dovetail groove 221
The flash 931 of outflow is by resistance, it is suppressed that further diffusion, to inhibit the generation of flash 931.Since roughing forms
With the inclined surface S of the dovetail groove 221 of mold 200, the part of inclined plane type is formed in the middle section of trapezoidal flash 931.
Next, using finishing mold for forming 300, making in roughing molding procedure in finishing molding procedure
Molding material is shaped to the finished form with the crankshaft of machining allowance.Specifically, as shown in Figure 10, firstly, will slightly add
The configuration in the lower die 310 of finishing mold for forming 300 of molding material 920 is constituting a part of chamber in work molding procedure
Part.
At this point, making in roughing molding procedure the shape in the dovetail groove 221 of the lower die 210 of roughing mold for forming 200
(do not scheme in a pair of of dovetail groove of the trapezoidal flash of a pair on material respectively with the lower die 310 of finishing mold for forming 300
Show) engaging.At the same time, make in roughing molding procedure by the 1st roughing of the lower die 210 of roughing mold for forming 200
Mold flat surface 224, the molding 1st material supporting part bearing surface 932 of the 3rd preform moulds flat surface 225, the bearing of the 3rd material
Portion's bearing surface (not shown) is abutted with the protrusion end face of the 1st material supporting part 324, the 3rd material supporting part (not shown) respectively.
That is, in the same manner as roughing molding procedure, in the dovetail groove of the lower die 310 of finishing mold for forming 300, under
The part for being equivalent to two trapezoidal bevel edges of the dovetail groove (not shown) of mould 310 in roughing molding procedure roughing at
The part of two bevel edges of the trapezoidal flash 931 on material is formed in the dovetail groove 221 of the lower die 210 of type mold 200
It is abutted respectively by face, therefore, trapezoidal flash reliably engages with dovetail groove 221, and material 930 is steadily supported on finishing
The lower die 310 of mold for forming 300.In addition, the 1st material supporting part bearing surface 932, the 3rd material supporting part bearing surface (are not schemed
Show) it is abutted respectively with the protrusion end face of the 1st material supporting part 324, the 3rd material supporting part (not shown) by face.Material as a result,
930 with the roughing molding procedure the case where in the same manner as, by a pair of of dovetail groove (not shown), the jag of the 1st material supporting part 324
Face and the part of the protrusion end face of the 3rd material supporting part (not shown) this four support, and loosening will not be generated, relative to finishing
The lower die 310 of mold for forming 300 is positioned, to be steadily supported on the lower die 310 of finishing mold for forming 300
In.
In this state, the die joint of the die joint (not shown) and upper mold (not shown) that make lower die 310 is close to each other simultaneously
It abuts, to be molded, in the chamber formed by lower die 310 and upper mold, material 930 is shaped to the song with machining allowance
The finished form of axis.At this point, due to also being formed in the dovetail groove (not shown) of the lower die 310 of finishing mold for forming 300
There is inclined surface, the diffusion of flash is suppressed, to inhibit the generation of flash.
According to the present embodiment, effect below is played.
In present embodiment, carrying out that there is roller-compaction process, roughing molding procedure, the heat for finishing molding procedure
In the manufacturing method of the in-line three-cylinder engine crankshaft of forging, in roller-compaction process, by cylindrical 910 conduct of billet
Raw material are made using the roller-compaction mold 100 with lower die 110 and upper mold (not shown) according to the shape of each crankshaft
Billet 910 as material is shaped to be similar to the shape of the finished form of crankshaft, in roughing molding procedure, using having
The roughing mold for forming 200 of lower die 210 and upper mold is shaped to molding material 920 in roller-compaction process more closely
It is similar to the shape of the finished form of crankshaft, in finishing molding procedure, is formed using the finishing with lower die 310 and upper mold
With mold 300, molding material 930 in roughing molding procedure is made to be shaped to the finished form with the crankshaft of machining allowance.
As roller-compaction mold 100 lower die 110, the lower die 210 of roughing mold for forming 200, be finish-machined to
The lower die 310 of type mold 300, using following such lower die: in the vertical direction, being formed in the journal shaft to crankshaft
The arranged beneath of journal shaft forming part have molding 2nd pin forming part carried out to the 2nd of crankshaft pin, be formed with the 2nd pin at
The dovetail groove of type portion connection, the dovetail groove are recessed to vertical lower section, and use along roller-compaction mold 100, roughing molding
Mold 200 and each die joint for finishing mold for forming 300 extend, and dovetail groove is at least formed with a pair, in dovetail groove
The flash of middle generation and the 2nd pin connection of crankshaft.
As the lower die 210 of roughing mold for forming 200, using following such lower die: being located at and the 2nd pin forming part
There is inclined surface S, inclined surface S to inhibit material 920 from trapezoidal for the bottom surface of dovetail groove 221 on 214 direction axially intersected
Slot 221 is flowed out along the die joint 211 of roughing mold for forming 200 and the generation of the flash of composition.
In roughing molding procedure, make in roller-compaction process in the trapezoidal of the lower die 110 of roller-compaction mold 100
Each flash 931 being formed on material in slot 121 blocks with the dovetail groove 221 of the lower die 210 of roughing mold for forming 200 respectively
It closes, positions molding material 920 in roller-compaction process relative to the lower die 210 of roughing mold for forming 200.
It, can be relative to roughing mold for forming as a result, by supporting trapezoidal flash 931 by a pair of of dovetail groove 221
200 210 locator material 920 of lower die, so as to the steadily Zhi Chengcai in the lower die 210 of roughing mold for forming 200
Material 920.In addition, being able to suppress the generation for the flash 931 that material is constituted from the outflow of dovetail groove 221 using inclined surface S.Therefore,
It is able to suppress decrease in yield.In addition, not formed and being inclined in other parts due to only forming inclined surface S on a pair of of dovetail groove 221
Inclined-plane S, therefore load when being able to suppress forging becomes larger.Further, since in the dovetail groove 221 being connected to the 2nd pin forming part 214
On form inclined surface S, as in the present embodiment, in the case where being not provided with counterweight with the 2nd adjacent arm of pin, can press down
The flash that system generates becomes more.It is stretched out therefore, because being able to suppress flash 931 from roughing mold for forming 200, it is thus possible to make
Mold for other processes is adjacent to configuration, further, it is possible to which flash 931 whens forged article transmission etc. is inhibited to cause the feelings of obstacle
Condition.It, correspondingly being capable of the efficiently and easily packing material in the chamber of mold furthermore it is possible to inhibit the generation of flash 931.
Also, in roller-compaction process, as the lower die 110 of roller-compaction mold 100, using it is following it is such under
Mould 110: the 1st rolls mold flat surface in the region surrounded by the 1st pin forming part 113 and a pair of of arm forming part 116
124, the 1st pin forming part 113 forms the 1st of crankshaft pin, and the pair of arm forming part 116 is to crankshaft and the
1 pin adjacent pair arm is formed, and is had in the region surrounded by the 3rd pin forming part 115 with a pair of of arm forming part 118
There is the 3rd to roll mold flat surface 125, the 3rd pin forming part 115 forms the 3rd pin of crankshaft, the pair of arm
Forming part 118 is formed to crankshaft with the 3rd pin adjacent pair arm.
In roughing molding procedure, as the lower die 210 of roughing mold for forming 200, using it is following it is such under
Mould 210: have the 1st preform moulds flat in the region surrounded by the 1st pin forming part 213 with a pair of of arm forming part 216
Face 224, the 1st pin forming part 213 form the 1st of crankshaft pin, the pair of arm forming part 216 to crankshaft with
1st pin adjacent pair arm is formed, in the region surrounded by the 3rd pin forming part 215 and a pair of of arm forming part 218
With the 3rd preform moulds flat surface 225, the 3rd pin forming part 215 forms the 3rd pin of crankshaft, the pair of
Arm forming part 218 is formed to crankshaft with the 3rd pin adjacent pair arm.
From the die joint 111 to the 1st of the lower die 110 of roller-compaction mold 100 roll the depth of mold flat surface 124 with
Depth from die joint to the 1st preform moulds flat surface 224 of the lower die 210 of roughing mold for forming 200 is identical, from stone roller
The die joint 111 to the 3rd of the molded lower die 110 with mold 100 roll the depth of mold flat surface 125 with from roughing at
The depth of die joint to the 3rd preform moulds flat surface 225 of the lower die 210 of type mold 200 is identical.
Thus in roller-compaction process, mold flat surface 124 and the 3rd can be rolled the 1st and roll mold flat surface
Therefore billet 910 of the mounting as material on 125 can be closed with the probably consistent position in the axle center with journal shaft forming part 212
System configures cylindrical billet 910 in roller-compaction mold 100.Therefore, it is able to suppress the axis of cylindrical billet 910
The heart becomes decrease in yield caused by inclined positional relationship relative to the axle center of journal shaft forming part 212.
In addition, the trapezoidal flash 931 of material 920 is by roughing mold for forming 200 in roughing molding procedure
A pair of of dovetail groove 221 of lower die 210 support respectively, at the same time, the 1st preform moulds flat surface bearing surface of material 920
921, the 3rd preform moulds flat surface bearing surface (not shown) is respectively by the 1st preform moulds flat surface 224, the 3rd roughing mould
Have flat surface 225 to support, material 920 is supported by total four parts of roughing mold for forming 200.Therefore, 920 energy of material
Enough do not generate is loosely positioned relative to the lower die 210 of roughing mold for forming 200, to be steadily supported on thick
In the lower die 210 of machine-shaping mold 200.
Also, finishing molding procedure in, as finishing mold for forming 300 lower die 310, using it is following in this way
Lower die 310: there is the 1st material supporting part in the region surrounded by the 1st pin forming part 313 and a pair of of arm forming part 316
324, the 1st pin forming part 313 forms the 1st of crankshaft pin, and the pair of arm forming part 316 is to crankshaft and the
1 pin adjacent pair arm is formed, and has the 3rd in the region surrounded by the 3rd pin forming part and a pair of of arm forming part
Material supporting part (not shown), the 3rd pin forming part form the 3rd pin of crankshaft, the pair of arm forming part pair
Crankshaft is formed with the 3rd pin adjacent pair arm.
Depth from the die joint of the lower die 310 of finishing mold for forming 300 to the 1st material supporting part 324 with from thick
The depth of 211 to the 1st preform moulds flat surface 224 of die joint of the lower die 210 of machine-shaping mold 200 is identical, from essence
The depth of the die joint of the lower die 310 of machine-shaping mold 300 to the 3rd material supporting part (not shown) is formed with from roughing
Depth with 211 to the 3rd preform moulds flat surface 225 of die joint of the lower die 210 of mold 200 is identical.
Thus in finishing molding procedure, the trapezoidal flash 931 of material 930 is finish-machined to type mold 300
A pair of of dovetail groove (not shown) of lower die 310 supports respectively, at the same time, the 1st material supporting part bearing surface 932 of material 930,
3rd material supporting part bearing surface (not shown) respectively by the protrusion end face of the 1st material supporting part 324, the 3rd material supporting part it is prominent
End surface supporting out, total four parts that material 930 is finish-machined to type mold 300 support.Therefore, material 930 can not
It generates the lower die 310 loosely relative to finishing mold for forming 300 to be positioned, to be steadily supported on finishing
In the lower die 310 of mold for forming 300.
The present invention is not limited to the above embodiments, can reach deformation, improvement etc. in the range of the object of the invention and all wrap
Containing in the present invention.
For example, in the present embodiment, the lower die 110 of roller-compaction mold 100, roughing mold for forming 200
Lower die 210 finishes in the lower die 310 of mold for forming 300, forms a pair of of dovetail groove, but be not limited to the structure.Dovetail groove
As long as at least being formed a pair of.In addition, the structure of the mold used in the manufacturing method of in-line three-cylinder engine crankshaft is not
It is limited to the roller-compaction mold 100 in present embodiment, roughing mold for forming 200, finishes mold for forming 300
Structure.
Claims (3)
1. a kind of manufacturing method of crankshaft carries out forming with roller-compaction process, roughing in the manufacturing method of the crankshaft
Process and the hot forging for finishing molding procedure, the manufacturing method of the crankshaft is characterized in that,
In the roller-compaction process, using cylindrical billet as raw material, using being rolled into lower die and upper mold
Type mold makes the billet as material be shaped to be similar to the shape of the finished form of crankshaft according to the shape of each crankshaft,
In the roughing molding procedure, using the roughing mold for forming with upper die and lower die, make described be rolled into
Molding material is shaped to more be similar to the shape of the finished form of crankshaft in type process,
In the finishing molding procedure, using the finishing mold for forming with lower die and upper mold, make the roughing
Molding material is shaped to the finished form with the crankshaft of machining allowance in molding procedure,
Lower die, the lower die of the roughing mold for forming, the finishing as the roller-compaction mold, which form, to be used
The lower die of mold, using following such lower die: in the vertical direction, the journal shaft to crankshaft carry out molding journal shaft at
The arranged beneath in type portion, which has, carries out molding 2nd pin forming part to the 2nd pin of crankshaft, is formed with and connects with the 2nd pin forming part
Logical slot, the slot are recessed to vertical lower section, and along the roller-compaction mold, the roughing mold for forming and
Each die joint of the finishing mold for forming extends to mould ends, and the slot is at least formed with a pair, in the slot
The flash of middle generation and the 2nd pin connection of crankshaft,
As the lower die of the roughing mold for forming, using following such lower die: selling forming part positioned at the described 2nd
The bottom surface of the slot on the direction axially intersected has inclined surface, and the inclined surface inhibits material from the slot along described thick
The die joint of machine-shaping mold flows out and the generation of the flash of composition,
In the roughing molding procedure, make in the roller-compaction process in the institute of the lower die of the roller-compaction mold
State each flash being formed in slot on material engage respectively with the slot of the lower die of the roughing mold for forming and
By the slot bearing of the lower die of the roughing mold for forming, thus make molding material phase in the roller-compaction process
Lower die positioning for the roughing mold for forming.
2. the manufacturing method of crankshaft according to claim 1, which is characterized in that
In the roller-compaction process, as the lower die of the roller-compaction mold, using following such lower die: by
To the 1st of crankshaft pin carry out molding 1st pin forming part and to the arm adjacent with the 1st pin of crankshaft carry out molding arm at
In the region that type portion surrounds, have the 1st to roll mold flat surface, molding 3rd pin forming part is being carried out by the 3rd pin to crankshaft
It is carried out in the region that molding arm forming part surrounds with the arm adjacent with the 3rd pin to crankshaft, has the 3rd to roll mold and put down
Smooth face,
In the roughing molding procedure, as the lower die of the roughing mold for forming, using following such lower die:
Molding 1st pin forming part is being carried out by the 1st pin to crankshaft and molding arm is carried out to the arm adjacent with the 1st pin of crankshaft
In the region that portion's forming part surrounds, there is the 1st preform moulds flat surface, molding 3rd pin is being carried out by the 3rd pin to crankshaft
Forming part and the arm adjacent with the 3rd pin to crankshaft carry out in the region that molding arm forming part surrounds, have the 3rd it is thick plus
Tool and mould flat surface,
From the die joint of the lower die of the roller-compaction mold to the described 1st roll the depth of mold flat surface with from described thick
The depth of the die joint of the lower die of machine-shaping mold to the 1st preform moulds flat surface is identical,
From the die joint of the lower die of the roller-compaction mold to the described 3rd roll the depth of mold flat surface with from described thick
The depth of the die joint of the lower die of machine-shaping mold to the 3rd preform moulds flat surface is identical.
3. the manufacturing method of crankshaft according to claim 2, which is characterized in that
In the finishing molding procedure, as the lower die of the finishing mold for forming, using following such lower die:
Molding 1st pin forming part is being carried out by the 1st pin to crankshaft and molding arm is carried out to the arm adjacent with the 1st pin of crankshaft
In the region that portion's forming part surrounds, there is the 1st material supporting part, molding 3rd pin forming part is being carried out by the 3rd pin to crankshaft
It is carried out in the region that molding arm forming part surrounds with the arm adjacent with the 3rd pin to crankshaft, there is the bearing of the 3rd material
Portion,
Slightly add from the depth of die joint to the 1st material supporting part of the lower die of the finishing mold for forming with from described
The depth of the die joint of the lower die of work mold for forming to the 1st preform moulds flat surface is identical,
Slightly add from the depth of die joint to the 3rd material supporting part of the lower die of the finishing mold for forming with from described
The depth of the die joint of the lower die of work mold for forming to the 3rd preform moulds flat surface is identical.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015060613A JP5992064B1 (en) | 2015-03-24 | 2015-03-24 | Crankshaft manufacturing method |
| JP2015-060613 | 2015-03-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106001380A CN106001380A (en) | 2016-10-12 |
| CN106001380B true CN106001380B (en) | 2018-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610119575.4A Active CN106001380B (en) | 2015-03-24 | 2016-03-03 | The manufacturing method of crankshaft |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5992064B1 (en) |
| CN (1) | CN106001380B (en) |
| CA (1) | CA2923915C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109127999B (en) * | 2018-10-31 | 2020-03-27 | 中冶陕压重工设备有限公司 | Forging method of concave gear shaft |
| WO2021053812A1 (en) * | 2019-09-20 | 2021-03-25 | 本田技研工業株式会社 | Forging method |
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|---|---|---|---|---|
| GB2145949A (en) * | 1983-07-26 | 1985-04-11 | Honda Motor Co Ltd | Method of forging a crankshaft |
| US6199275B1 (en) * | 1998-05-19 | 2001-03-13 | Honda Giken Kogyo Kabushiki Kaisha | Method for forming crank shaft and method for producing crank shaft |
| CN201815620U (en) * | 2010-09-28 | 2011-05-04 | 西南大学 | Die for forging high-precision crank shaft |
| CN102548684A (en) * | 2010-09-17 | 2012-07-04 | 丰田自动车株式会社 | Crankshaft production method and production apparatus |
| WO2014091730A1 (en) * | 2012-12-12 | 2014-06-19 | 新日鐵住金株式会社 | Device for forming finish-forging element for forged crankshaft for 3-cylinder engine and method for producing forged crankshaft for 3-cylinder engine using same |
| JP6190487B2 (en) * | 2016-04-14 | 2017-08-30 | サミー株式会社 | Bullet ball machine |
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|---|---|---|---|---|
| JPS58132342A (en) * | 1982-01-29 | 1983-08-06 | Nissan Motor Co Ltd | Forging method of coarse material of crank shaft |
| JPS59223132A (en) * | 1983-06-02 | 1984-12-14 | Honda Motor Co Ltd | Hot forging device |
| JPH06190487A (en) * | 1992-12-22 | 1994-07-12 | Mazda Motor Corp | Forging method |
| JP2004322137A (en) * | 2003-04-23 | 2004-11-18 | Nissan Motor Co Ltd | Method and die for forging crankshaft |
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2015
- 2015-03-24 JP JP2015060613A patent/JP5992064B1/en active Active
-
2016
- 2016-03-03 CN CN201610119575.4A patent/CN106001380B/en active Active
- 2016-03-16 CA CA2923915A patent/CA2923915C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2145949A (en) * | 1983-07-26 | 1985-04-11 | Honda Motor Co Ltd | Method of forging a crankshaft |
| US6199275B1 (en) * | 1998-05-19 | 2001-03-13 | Honda Giken Kogyo Kabushiki Kaisha | Method for forming crank shaft and method for producing crank shaft |
| CN102548684A (en) * | 2010-09-17 | 2012-07-04 | 丰田自动车株式会社 | Crankshaft production method and production apparatus |
| CN201815620U (en) * | 2010-09-28 | 2011-05-04 | 西南大学 | Die for forging high-precision crank shaft |
| WO2014091730A1 (en) * | 2012-12-12 | 2014-06-19 | 新日鐵住金株式会社 | Device for forming finish-forging element for forged crankshaft for 3-cylinder engine and method for producing forged crankshaft for 3-cylinder engine using same |
| JP6190487B2 (en) * | 2016-04-14 | 2017-08-30 | サミー株式会社 | Bullet ball machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2016179480A (en) | 2016-10-13 |
| JP5992064B1 (en) | 2016-09-14 |
| CA2923915A1 (en) | 2016-09-24 |
| CA2923915C (en) | 2018-05-22 |
| CN106001380A (en) | 2016-10-12 |
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