CN104174803B - High-pressure common rail Preform Die - Google Patents
High-pressure common rail Preform Die Download PDFInfo
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- CN104174803B CN104174803B CN201410441957.XA CN201410441957A CN104174803B CN 104174803 B CN104174803 B CN 104174803B CN 201410441957 A CN201410441957 A CN 201410441957A CN 104174803 B CN104174803 B CN 104174803B
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Abstract
The present invention relates to a kind of high-pressure common rail Preform Die, Preform Die is made up of mould under mould on blocking and blocking, the upper surface of mould cooperatively forms the die cavity for constituting rail body and multiple pipe arrangements under the basal surface and blocking of mould on blocking, and the die cavity of the rail body and the die cavity of pipe arrangement are interconnected；And it is formed with resistance material boss at the two ends of the die cavity of the pipe arrangement on the basal surface of mould on the blocking, and the upper surface of mould is formed with the resistance material groove being engaged with the boss at the two ends of the die cavity of the pipe arrangement under the blocking, the resistance material boss and the resistance material groove constitute resistance material structure.Preform Die of the present invention can make full use of the defective products rate of the ability that self-locking blocks blank, finished product forging to be less than 2500 ppm, far below the average level of 6000 ppm of the same trade of prediction；Unit product stock utilization brings up to 78~85% by 65~72%；Raw material have been saved, the overall economics effect of energy-saving and emission-reduction has been realized.
Description
Technical field
The present invention relates to the technical field of engine fittings processing, it is more particularly related to a kind of be used for automobile
The high-pressure common rail Preform Die of engine.
Background technology
High pressure co-rail system drastically increases the cornering ability and discharge performance of automobile engine, with emission aftertreatment
The progress of technology and air-fuel ratio control technology, is cost no longer to sacrifice the high thermal efficiency of engine, energy-saving for realizing
It is significant with environmental protection.Current high pressure co-rail system turned into automobile industry engine art core technology it
One.In China, start to break the technical monopoly of foreign countries, gradually formed autonomous core technology system.
In common rail type diesel engine, the pipe arrangement for being referred to as common rail is arranged between pump and injection valve, in the common rail
The fuel of the high pressure that pressure accumulation is sent from pump pressure, dispenses fuel into the injection valve of each cylinder from here.In the fuel of the joint-track type
In spraying system, by computer, from low-speed region to high-speed region, the opportunity to fuel injection amount or injection carries out high accuracy
Control, compared with conventional Diesel engine, significantly exhaust gas cleaning degree, burnup performance, the raising of output can be realized
And noise, the performance of the attenuating of vibration are improved.In order to tackle increasingly strict exhaust emissions requirement and for quietness
Improvement, burnup performance, the raising of output, while the high-pressure injection of common rail type diesel engine is advanced, to using altogether
Fuel injection pipe requirement in rail has resistance to pressure higher.Therefore, my company develops a kind of high-pressure common rail, the product structure is answered
It is miscellaneous, it is elongated rod body, above there are eight boss, elongated rod body part is yielding in forging process, and raised head face is difficult filling, die cavity
Interior bosom oxide skin not easy-clear, forging difficulty is big.The geometric properties of this class product, and existing production technology work are pressed by my company
Skill condition, successively takes the multiple technologies methods such as various improvement bases, blocking, but cause because the local groove of mould is very deep
Blank lack of fill and be difficult to reach design and use requirement.
The content of the invention
In order to solve above-mentioned technical problem of the prior art, it is an object of the invention to provide one kind enhancing blank filling
The high-pressure common rail Preform Die of effect.
For the technical problem solved described in invention and goal of the invention is realized, present invention employs following technical scheme：
A kind of high-pressure common rail Preform Die, it is characterised in that：The Preform Die is made up of mould under mould on blocking and blocking,
The upper surface of mould cooperatively forms the die cavity for constituting rail body and multiple pipe arrangements, and institute under the basal surface and blocking of mould on the blocking
The die cavity of the die cavity and pipe arrangement of stating rail body is interconnected；And on the blocking on the basal surface of mould the pipe arrangement die cavity two
End be formed with mould under resistance material boss, and the blocking upper surface be formed with the two ends of the die cavity of the pipe arrangement it is convex with described
The resistance material groove that platform is engaged, the resistance material boss and the resistance material groove constitute resistance material structure.
Wherein, the material that described Preform Die is used be boron-containing die steel, the chemical composition of the boron-containing die steel and
Its mass percent is：The content of C is 0.35 ~ 0.40% for the content that the content of 0.38 ~ 0.42%, Cr is 8.8 ~ 10.2%, Si,
The content of Mn for 0.75 ~ 0.90%, Ni content for 0.32 ~ 0.40%, Mo content for 0.08 ~ 0.12%, V content 0.40 ~
The content of 0.45%, N is containing for 0.20 ~ 0.25%, P for the content that the content of 0.005 ~ 0.012%, Al is 0.010 ~ 0.025%, B
Measure content≤0.025% of≤0.030%, S, balance of Fe and inevitable impurity.
Compared with prior art, high-pressure common rail Preform Die of the present invention has the advantages that：
1. the ability for making full use of mould self-locking to block blank, significantly enhances the technique effect of blocking, finished product forging
Defective products rate is less than 2500 ppm, far below the average level of 6000 ppm of the same trade of prediction；
2. avoid causes forging boss to produce the critical defect for lacking material because blocking gathers material deficiency, is greatly reduced
Internal soundness cost, for example, reduce Product checking, quality and reprocess rework cost；
3., because with significant lock material function, reducing material consumption, unit product stock utilization is carried by 65~72%
It is high to 78~85%；Raw material have been saved, the overall economics effect of energy-saving and emission-reduction has been realized；
4. product streamline direction controlling is more reasonable, and state is excellent, and surface crack defect rate is less than 1000 ppm；Product
Surface roughness is low, less or without surface quality defects such as obvious surface oxidation pockmarks.
Brief description of the drawings
Fig. 1 shows for the structural representation of high-pressure common rail Preform Die and the cross-sectional structure of Section A-A of prior art
It is intended to；
Fig. 2 is that the structural representation of high-pressure common rail Preform Die of the invention and the cross-sectional structure of Section A-A are illustrated
Figure；
Fig. 3 is the structural representation and the cross-sectional structure schematic diagram of Section A-A of the upper mould of inventive die；
Fig. 4 is the structural representation and the cross-sectional structure schematic diagram of Section A-A of the lower mould of inventive die；
Fig. 5 is the schematic diagram of the high-pressure common rail Preform Die filling effect of prior art；
Fig. 6 is the schematic diagram of high-pressure common rail Preform Die filling effect of the invention；
Fig. 7 uses (0.15Cr+3V)/(10N+0.75B+C) in boron-containing die steel and the relation of impact flexibility for the present invention
Figure.
Specific embodiment
High-pressure common rail Preform Die of the present invention is further elaborated below with reference to specific embodiment, to help
Help those skilled in the art has more complete, accurate and deep understanding to inventive concept of the invention, technical scheme.
The present invention has found that the lower surface of mould 1 sets on blocking in the design basis of Preform Die as shown in the accompanying figure 1
Meter resistance material boss, resistance material groove is designed so as to form resistance material structure as shown in Figure 2 in the upper surface of mould 2 under blocking.It is specific next
Say, the Preform Die is made up of mould under mould on blocking and blocking, on the blocking under the basal surface and blocking of mould mould upper table
Face cooperatively forms the die cavity for constituting rail body and multiple pipe arrangements, and the die cavity of the rail body and the die cavity of pipe arrangement are interconnected；And
On the blocking on the basal surface of mould in the case where the two ends of the die cavity of the pipe arrangement are formed with resistance material boss, and the blocking mould
Upper surface is formed with the resistance material groove being engaged with the boss, the resistance material boss and institute at the two ends of the die cavity of the pipe arrangement
State resistance material groove and constitute resistance material structure.So in the closing course of mould, lock material ability that can be powerful promotes material to work
Part die cavity strengthens filling capacity.As shown in Figure 3, in mould original design basis on blocking, increase resistance material boss, analyze metal material
The associate features such as material thermal fluidity, mould inside die cavity feature, hot-die forging machine operating pressure, by simulating blocking state status,
It is determined that relative to the position of workpiece die cavity, determining length, width, height and the bull nose of boss；These parameter values can pass through
Computer Simulation calculation is obtained, and can make corresponding adjustment according to actual situation.As shown in Figure 4, under blocking
In mould original design basis, increase resistance material groove, analysis of metallic materials thermal fluidity, mould inside die cavity feature, hot-die forging machine work
Make the associate features such as pressure, by simulating blocking state status, it is determined that relative to the position of workpiece die cavity, determining the length of groove
Degree, width, depth and bull nose.Wherein, the groove in the longitudinal direction, takes the dimensions length two ends corresponding to boss and respectively adds
5mm, is defined by the boss that can uniformly contain upper mould outermost.And boss is designed in upper mould, groove is designed in lower mould, just
Convenient, 0.1~0.15mm of fit clearance in operative.
In the present invention, the material that described Preform Die is used is boron-containing die steel, the chemistry of the boron-containing die steel
Composition and its mass percent are：The content of C for 0.38 ~ 0.42%, Cr content for 8.8 ~ 10.2%, Si content for 0.35 ~
The content of 0.40%, Mn is the content of 0.08 ~ 0.12%, V for the content that the content of 0.75 ~ 0.90%, Ni is 0.32 ~ 0.40%, Mo
The content of 0.40 ~ 0.45%, N is 0.20 ~ 0.25% for the content that the content of 0.005 ~ 0.012%, Al is 0.010 ~ 0.025%, B,
Content≤0.030% of P, content≤0.025% of S, balance of Fe and inevitable impurity.And in order to obtain impact high
Toughness, the mass percent of Cr, V, N, B and C also needs to meet relationship below in the boron-containing die steel：3.9≤
(0.15Cr+3V)/(10N+0.75B+C) ≤4.5.In the present invention, by the forging of mould under mould on the blocking after forging and blocking
Temperature is chilled to 550~600 DEG C by being not less than 800 DEG C, and time span is 2.5 minutes；Then by mould on the blocking and in advance
The lower mould of forging is positioned in heat-treatment furnace after being heated to 1030 ~ 1050 DEG C, is incubated 2 hours；Then protected after stove is cooled to 930 ~ 950 DEG C
Temperature 2 hours, is then cooled down in 160 ~ 200 DEG C of quenching nitrate furnace, and cool time is 2.5 ~ 3.0 hours, then in sky
Room temperature is naturally cooled in gas；Finally mould under mould on the blocking after quenching and blocking is carried out in heating furnace in 200 ~ 220 DEG C
Temper, process time is 6 ~ 8 hours, and then stove is come out of the stove air cooling after being cooled to 100 DEG C.As shown in fig. 7, by causing institute
The relational expression of component meets 3.9≤(0.15Cr+3V)/(10N+0.75B+C)≤4.5 and could cause in the boron-containing die steel stated
The impact flexibility of the boron-containing die steel for being used is not less than 15 Jcm-2；Preferably, following relational expression is met：4.0≤
(0.15Cr+3V)/(10N+0.75B+C) ≤4.4。
After being heat-treated to above-mentioned Preform Die, digital control processing mould is used so that the rail build chamber and with cast
The surface roughness in chamber is not higher than, surface smoothness is good；And the rough surface of the resistance material boss and the resistance material groove
Spend and be, to increase the frictional resistance of material outflow.In a word, high-pressure common rail Preform Die of the present invention is effectively
The aggregation of blank inside is realized, is that finish forging creates advantage；And the final present invention is compared with prior art, blocker
Filling effect contrast can be given by the contrast of Fig. 5 and Fig. 6.
Embodiment 1
In the present embodiment, the material that Preform Die is used is boron-containing die steel, the chemical composition of the boron-containing die steel
And its mass percent is：The content of C is the content that the content of 0.38%, Cr is 10.2%, Si for the content of 0.35%, Mn is
The content of 0.90%, Ni is the content 0.40% of 0.08%, V for the content of 0.40%, Mo, and the content of N is for the content of 0.012%, Al
The content of 0.015%, B is 0.012% for the content that the content of 0.20%, P is 0.021%, S, and balance of Fe is miscellaneous with inevitable
Matter.Described Preform Die is by following heat treatment：By the forging temperature of mould under mould on the blocking after forging and blocking by not low
550 DEG C are chilled in 800 DEG C, time span is 2.5 minutes；Then mould under mould on the blocking and blocking is positioned over hot place
After being heated to 1050 DEG C in reason stove, 2 hours are incubated；Then 2 hours are incubated after stove is cooled to 930 DEG C, then at 160 ~ 200 DEG C
Cooled down in quenching nitrate furnace, cool time is 2.5 hours, and room temperature is then naturally cooled in atmosphere；Finally will quenching
Mould carries out temper in heating furnace in 220 DEG C under mould and blocking on blocking afterwards, and process time is 6 hours, and then stove is cold
Come out of the stove after to 100 DEG C air cooling.
Embodiment 2
In the present embodiment, the material that Preform Die is used is boron-containing die steel, the chemical composition of the boron-containing die steel
And its mass percent is：The content of C is the content that the content of 0.42%, Cr is 10.2%, Si for the content of 0.40%, Mn is
The content of 0.75%, Ni is the content 0.45% of 0.12%, V for the content of 0.32%, Mo, and the content of N is for the content of 0.010%, Al
The content of 0.020%, B is 0.018% for the content that the content of 0.22%, P is 0.025%, S, and balance of Fe is miscellaneous with inevitable
Matter.Described Preform Die is by following heat treatment：By the forging temperature of mould under mould on the blocking after forging and blocking by not low
550 DEG C are chilled in 800 DEG C, time span is 2.5 minutes；Then mould under mould on the blocking and blocking is positioned over hot place
After being heated to 1050 DEG C in reason stove, 2 hours are incubated；Then 2 hours are incubated after stove is cooled to 930 DEG C, then at 160 ~ 200 DEG C
Cooled down in quenching nitrate furnace, cool time is 2.5 hours, and room temperature is then naturally cooled in atmosphere；Finally will quenching
Mould carries out temper in heating furnace in 220 DEG C under mould and blocking on blocking afterwards, and process time is 6 hours, and then stove is cold
Come out of the stove after to 100 DEG C air cooling.
Embodiment 3
In the present embodiment, the material that Preform Die is used is boron-containing die steel, the chemical composition of the boron-containing die steel
And its mass percent is：The content of C is the content that the content of 0.40%, Cr is 8.8%, Si for the content of 0.38%, Mn is
The content of 0.85%, Ni is the content 0.43% of 0.10%, V for the content of 0.36%, Mo, and the content of N is for the content of 0.006%, Al
The content of 0.010%, B is 0.015% for the content that the content of 0.20%, P is 0.023%, S, and balance of Fe is miscellaneous with inevitable
Matter.Described Preform Die is by following heat treatment：By the forging temperature of mould under mould on the blocking after forging and blocking by not low
550 DEG C are chilled in 800 DEG C, time span is 2.5 minutes；Then mould under mould on the blocking and blocking is positioned over hot place
After being heated to 1050 DEG C in reason stove, 2 hours are incubated；Then 2 hours are incubated after stove is cooled to 930 DEG C, then at 160 ~ 200 DEG C
Cooled down in quenching nitrate furnace, cool time is 2.5 hours, and room temperature is then naturally cooled in atmosphere；Finally will quenching
Mould carries out temper in heating furnace in 220 DEG C under mould and blocking on blocking afterwards, and process time is 6 hours, and then stove is cold
Come out of the stove after to 100 DEG C air cooling.
Comparative example 1
In this comparative example, the material that Preform Die is used is boron-containing die steel, the chemical composition of the boron-containing die steel
And its mass percent is：The content of C is the content that the content of 0.38%, Cr is 10.2%, Si for the content of 0.35%, Mn is
The content of 0.90%, Ni is the content 0.40% of 0.08%, V for the content of 0.40%, Mo, and the content of N is for the content of 0.012%, Al
The content of 0.015%, B is 0.012% for the content that the content of 0.20%, P is 0.021%, S, and balance of Fe is miscellaneous with inevitable
Matter.Described Preform Die is by following heat treatment：By the forging temperature of mould under mould on the blocking after forging and blocking by not low
Room temperature is air cooled in 800 DEG C；Then mould under mould on the blocking and blocking is positioned in heat-treatment furnace and is heated to 850 DEG C, protected
Warm 2 hours, after then heating to 1050 DEG C, it is incubated 2 hours；Then cooled down in 150 ~ 180 DEG C of quenching nitrate furnace,
Cool time is 2.0 hours, and 150 DEG C are then naturally cooled in atmosphere；Finally by under mould and blocking on the blocking after quenching
Mould carries out temper in heating furnace in 600 DEG C, and process time is 6 hours, and then stove comes out of the stove air cooling i.e. after being cooled to 100 DEG C
Can.
Comparative example 2
In this comparative example, the material that Preform Die is used is boron-containing die steel, the chemical composition of the boron-containing die steel
And its mass percent is：The content of C is the content that the content of 0.38%, Cr is 10.2%, Si for the content of 0.35%, Mn is
The content of 0.90%, Ni is the content 0.40% of 0.08%, V for the content of 0.40%, Mo, and the content of N is for the content of 0.012%, Al
The content of 0.015%, B is 0.012% for the content that the content of 0.20%, P is 0.021%, S, and balance of Fe is miscellaneous with inevitable
Matter.Described Preform Die is by following heat treatment：By the forging temperature of mould under mould on the blocking after forging and blocking by not low
500 DEG C are air cooled in 800 DEG C, 550 DEG C are then warming up in heat-treatment furnace, be incubated 4 hours；Then by mould on the blocking
It is positioned in heat-treatment furnace with mould under blocking after being heated to 1020 DEG C, is incubated 8 hours, it is then air-cooled to 400 DEG C；It is then heated to
650 DEG C, it is incubated 5 hours；820 DEG C are then heated to, 10 hours are incubated, 650 DEG C are subsequently cooled to, 4 hours is incubated, Ran Housui
Stove is cooled to less than 200 DEG C, air cooling.
The mechanical property of the boron-containing die steel obtained by specific embodiment of the invention and comparative example is as follows：
The mechanical property of the boron-containing die steel that the embodiment 1 ~ 3 of table 1 and comparative example 1 ~ 2 are obtained.
For the ordinary skill in the art, the present invention is implemented and is not subject to the restrictions described above, as long as
Employ the improvement of various unsubstantialities that method of the present invention design and technical scheme are carried out, or it is not improved will be of the invention
Design and technical scheme directly apply to other occasions, within protection scope of the present invention.
Claims (5)
1. a kind of high-pressure common rail Preform Die, it is characterised in that：The Preform Die is made up of mould under mould on blocking and blocking, institute
The upper surface for stating mould under the basal surface and blocking of mould on blocking cooperatively forms the die cavity for constituting rail body and multiple pipe arrangements, and rail body
Die cavity and with tubular cavity be interconnected；And it is formed with resistance at the two ends of the die cavity of the pipe arrangement on the basal surface of mould on the blocking
The upper surface of mould is formed with the two ends with tubular cavity and is engaged with the resistance material boss under material boss, and the blocking
Resistance material groove, the resistance material boss and the resistance material groove constitute resistance material structure；The material that described Preform Die is used is
Boron-containing die steel, the chemical composition and its mass percent of the boron-containing die steel are：The content of C is 0.38 ~ 0.42%, Cr's
Content for 8.8 ~ 10.2%, Si content for 0.35 ~ 0.40%, Mn content for 0.75 ~ 0.90%, Ni content for 0.32 ~
The content of 0.40%, Mo is the content 0.40 ~ 0.45% of 0.08 ~ 0.12%, V, and the content of N is for the content of 0.005 ~ 0.012%, Al
The content of 0.010 ~ 0.025%, B for 0.20 ~ 0.25%, P content≤0.030%, content≤0.025% of S, balance of Fe and
Inevitable impurity.
2. high-pressure common rail Preform Die according to claim 1, it is characterised in that：The rail build chamber and with tubular cavity
Surface roughness is not higher than, the surface roughness of the resistance material boss and the resistance material groove is 。
3. high-pressure common rail Preform Die according to claim 1, it is characterised in that：Cr, V, N, B in the boron-containing die steel
And the mass percent of C meets relationship below：3.9≤ (0.15Cr+3V)/(10N+0.75B+C) ≤4.5.
4. high-pressure common rail Preform Die according to claim 1, it is characterised in that：Cr, V, N, B in the boron-containing die steel
And the mass percent of C meets relationship below：4.0≤ (0.15Cr+3V)/(10N+0.75B+C) ≤4.4.
5. high-pressure common rail Preform Die according to claim 1, it is characterised in that：By mould and blocking on the blocking after forging
The forging temperature of lower mould is chilled to 550~600 DEG C by being not less than 800 DEG C, and time span is 2.5 minutes；Then will be described pre-
After mould is positioned in heat-treatment furnace and is heated to 1030 ~ 1050 DEG C under mould and blocking in forging, 2 hours are incubated；Then stove be cooled to 930 ~
2 hours are incubated after 950 DEG C, are then cooled down in 160 ~ 200 DEG C of quenching nitrate furnace, cool time is 1.5 ~ 2 hours, so
Naturally cool to room temperature in atmosphere afterwards；Finally by mould under mould on the blocking after quenching and blocking in heating furnace in 200 ~ 220
Temper DEG C is carried out, process time is 6 ~ 8 hours, then stove is come out of the stove air cooling after being cooled to 100 DEG C.
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| CN104174803B true CN104174803B (en) | 2017-06-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109433983A (en) * | 2018-12-26 | 2019-03-08 | 金马工业集团股份有限公司 | Hot forging mode and hot forging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106695249B (en) * | 2015-08-13 | 2019-12-13 | 江苏龙城精锻有限公司 | Forging forming process of high-pressure common rail pipe |
| CN109023104B (en) * | 2018-09-25 | 2021-01-26 | 成都先进金属材料产业技术研究院有限公司 | 4Cr13 plastic die steel and preparation method thereof |
| CN115673210A (en) * | 2022-10-31 | 2023-02-03 | 江苏理研科技股份有限公司 | Forging die for fuel common rail |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004141883A (en) * | 2002-10-21 | 2004-05-20 | Honda Motor Co Ltd | Double acting type forging shaping method and apparatus therefor |
| JP5471476B2 (en) * | 2010-01-14 | 2014-04-16 | トヨタ自動車株式会社 | Closure device and closure method |
| CN101880836B (en) * | 2010-07-14 | 2012-02-01 | 西安交通大学 | Boron-containing die steel and heat treatment method thereof |
| CN201815620U (en) * | 2010-09-28 | 2011-05-04 | 西南大学 | Die for forging high-precision crank shaft |
| CN201895060U (en) * | 2010-11-22 | 2011-07-13 | 衡阳市鹏润锻造有限公司 | Flash structure of open forging die |
| CN202861300U (en) * | 2012-09-20 | 2013-04-10 | 芜湖三联锻造有限公司 | Knuckle preforging die structure |
| CN203140670U (en) * | 2013-01-31 | 2013-08-21 | 江苏龙城精锻有限公司 | Claw pole pre-forging die structure |
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| CN109433983A (en) * | 2018-12-26 | 2019-03-08 | 金马工业集团股份有限公司 | Hot forging mode and hot forging device |
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