CN107016195A - It is ground the computational methods of fillet rolling crankshaft grinding wheel width - Google Patents

It is ground the computational methods of fillet rolling crankshaft grinding wheel width Download PDF

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Publication number
CN107016195A
CN107016195A CN201710228399.2A CN201710228399A CN107016195A CN 107016195 A CN107016195 A CN 107016195A CN 201710228399 A CN201710228399 A CN 201710228399A CN 107016195 A CN107016195 A CN 107016195A
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China
Prior art keywords
width
undercut groove
grinding wheel
grinding
max
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Pending
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CN201710228399.2A
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Chinese (zh)
Inventor
张淑琪
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GUILIN FUDA CRANKSHAFT CO Ltd
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GUILIN FUDA CRANKSHAFT CO Ltd
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Priority to CN201710228399.2A priority Critical patent/CN107016195A/en
Publication of CN107016195A publication Critical patent/CN107016195A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design

Abstract

The invention discloses a kind of computational methods for being ground fillet rolling crankshaft grinding wheel width, comprise the following steps：Boss grinding wheel width minimum value, calculating is not stayed to be ground to the grinding wheel width maximum of undercut groove fillet, determine grinding wheel width L number ranges on the diameter of axle after setting crankshaft parameters, the width for calculating undercut groove, the minimum widith for calculating correspondence undercut groove, calculating wheel grinding.The optimum width from emery wheel can accurately be calculated by adopting technical scheme, exclude select grinding wheel blindness efficiently solve bent axle in process because abrasive grinding wheel width select it is improper easily cause fray and undercut groove fillet or leave on the diameter of axle boss problem.

Description

It is ground the computational methods of fillet rolling crankshaft grinding wheel width
Technical field
The present invention relates to automobile engine crankshaft manufacture field, and in particular to one kind grinding fillet rolling crankshaft grinding wheel width Computational methods.
Background technology
Bent axle is considered as the heart of engine, is the power source of engine, and it is a kind of high speed rotating part, it is desirable to had Enough wearabilities and intensity, to improve the wearability and endurance life of bent axle, journal surface and fillet are needed by reinforcing Processing, and pass through fine grinding, to reach higher case hardness and surface roughness.Current passenger car crankshaft material typically has The two kinds of selections of spheroidal graphite cast-iron and steel alloy, generally using the round as a ball reinforcing of fillet and journal surface quenching technical, advantageously reduce energy Source is consumed, environmental protection.Bent axle is general by trunnion, several parts compositions such as rod journal, microcephaly and flange.General processing technology For：Smart car axle journal is cylindrical and the whole main shafts of undercut groove → axle journal mid frequency induction hardening → fillet rolling → fine grinding, connecting rod are cylindrical and thrust Face.During grinding, in addition to thrust shelves need to be ground side, other main shafts and connecting rod neck are only ground the diameter of axle, and side is not ground, can be significantly Improve production efficiency.
In this case, the selection of grinding spindle neck and connecting rod neck grinding wheel width is particularly important, and grinding wheel width L is selected too Width, can fray undercut groove fillet；Grinding wheel width L selections are too narrow, and endless whole diameters of axle are ground again, boss is left on the diameter of axle.Therefore, Width for how accurately to select abrasive grinding wheel, it appears particularly important.
The content of the invention
In view of the above-mentioned problems of the prior art, the present invention is how to solve bent axle in process the problem of solution Because abrasive grinding wheel width select it is improper easily cause fray and undercut groove fillet or leave on the diameter of axle boss problem.
For above-mentioned technical problem, the technical scheme that the present invention is provided is a kind of grinding fillet rolling crankshaft grinding wheel width Computational methods, comprise the following steps：
Step 1 sets crankshaft parameters；If a width of H of the shelves of main shaft or connecting rod neck, the radius of undercut groove is R, the depth of undercut groove Spend for h, the width of undercut groove is k, and main shaft or connecting rod journal width are m, and undercut groove relief angle is β, the recessed depth in undercut groove side Tolerance is labeled with for δ, wherein H, R, h, δ.
Step 2 calculates the width k of undercut groove according to the depth h of undercut groove；
(1) as h >=R-R.cos β, width k=R+R.sin β+cot β [h- (R-R.cos β)]-δ of undercut groove；
(2) as h ＜ R-R.cos β, the width of undercut groove
Step 3 is according to the depth h for corresponding to undercut groovemin, calculate the minimum widith k of correspondence undercut groovemin；
When R, h take minimum value, δ to take maximum, k values are minimum, i.e.,：
(1) h is worked asmin≥Rmin-Rmin.cos during β,
kmin=Rmin+Rmin.sinβ+cotβ[hmin-(Rmin-Rmin.cosβ)]–δmax... ... ... formula is 1.
(2) h is worked asmin＜ Rmin-Rmin.cos during β,
Step 4 does not stay boss emery wheel wide after calculating wheel grinding according to main shaft or connecting rod journal width m is calculated on the diameter of axle Spend minimum value L；
M=H-2k, mmax=Hmax-2kmin, in order that not staying boss after wheel grinding on the diameter of axle, then grinding wheel width L must L >=m must be metmax=Hmax-2kmin；
Step 5 calculates the grinding wheel width maximum L for being ground to undercut groove fillet0；
When H, δ, h take minimum value, R to take maximum, at this moment emery wheel is just ground to the grinding wheel width L of undercut groove fillet0It is The maximum of select grinding wheel width
Step 6 determines grinding wheel width L number ranges.
Grinding wheel width L span is：mmax≤L≤L0, it is preferable that take L=(L0+mmax)/2 as emery wheel width Value, more satisfactory, if emery wheel repairs small round corner sometimes, grinding wheel width L at this moment refers to remove effective after emery wheel fillet Width meets above-mentioned requirements.
The optimum width from emery wheel can accurately be calculated by adopting technical scheme, exclude the blindness of select grinding wheel Property efficiently solve bent axle in process because abrasive grinding wheel width select it is improper the undercut groove fillet that frays that easily causes Or boss problem is left on the diameter of axle.
Brief description of the drawings
Fig. 1 is crankshaft structure schematic diagram；
Fig. 2 is that grinding wheel width L selections are too wide, and fray undercut groove fillet situation；
Fig. 3 grinding wheel widths L selections are too narrow, and boss situation is left on the diameter of axle；
Fig. 4 is two kinds of patterns of undercut groove；
Fig. 5 is the computation model figure of Type B undercut groove；
Fig. 6 is the maximum grinding wheel width L that Type B undercut groove is ground to undercut groove fillet0Schematic diagram；
Fig. 7 is grinding wheel width L schematic diagrames when emery wheel has small round corner；
Fig. 8 is embodiment grinding wheel width computation model figure.
Fig. 9 is the optimal grinding wheel width figure of embodiment；
Figure 10 is effective width figure when embodiment emery wheel has fillet；
Figure 11 is flow chart of the present invention.
Embodiment
Embodiments of the present invention are described further with reference to the accompanying drawings and examples, but are not the limits to the present invention It is fixed.
Fig. 1 shows that crankshaft structure is illustrated, trunnion 1 (at I, II, IV, V), bent axle microcephaly 2, main bearing journal (thrust Shelves) 3, crankshaft flange 4, crank-shaft link neck 5 (1., 2., 3., 4. locate).
Fig. 2, Fig. 3 show bent axle in grinding process, the FAQs caused by sand round width is from inappropriate.
Fig. 4 shows two kinds of patterns of undercut groove, generally, and pattern B is used for thrust shelves axle journal；Pattern A is used to remove Remaining trunnion and connecting rod neck outside thrust shelves.
According to Fig. 5 (pattern B), draw：
As h >=R-R.cos β, width k=R+R.sin β+cot β [h- (R-R.cos β)]-δ of undercut groove
During h ＜ R-R.cos β, the width of undercut groove
According to Fig. 5, when R, h take minimum value, δ to take maximum, k values are minimum, i.e.,：
Work as hmin≥Rmin-Rmin.cos during β, kmin=Rmin+Rmin.sinβ+cotβ[hmin-(Rmin-Rmin.cosβ)]–δmax Formula is 1..
Work as hmin＜ Rmin-Rmin.cos during β,
According to Fig. 4, m=H-2k, m are drawnmax=Hmax-2kmin, in order that not staying boss after wheel grinding on the diameter of axle, see Fig. 3, then grinding wheel width L must be fulfilled for L >=mmax=Hmax-2kmin。
According to Fig. 6, when H, δ, h take minimum value, R to take maximum, at this moment emery wheel is just ground to the emery wheel of undercut groove fillet Width L0It is the maximum of select grinding wheel width.
Drawn according to Fig. 6：
In order to prevent emery wheel to be ground to undercut groove fillet, then grinding wheel width L≤L0。
Pattern A can regard a kind of special circumstances of pattern B δ=0 as, when 1. 2. 3. being calculated with formula, take δmaxOr δminEqual to zero.
In summary, grinding wheel width L span is：mmax≤L≤L0。
Preferably, L=(L are taken0+mmax)/2 as emery wheel width value, it is more satisfactory, if emery wheel is to repair roundlet sometimes Angle, grinding wheel width L at this moment refers to that the effective width removed after emery wheel fillet meets above-mentioned requirements, sees Fig. 7.
If Fig. 8 is a kind of crankshaft journal undercut groove mark, the width of emery wheel is selected after being calculated by the following step
The first step：Calculate the minimum widith k of undercut groovemin
hmin=0.2mm, Rmin-Rmin.cos β=1.65-1.65 × cos30=0.22 (mm), due to 0.2 ＜ 0.22, because This according to above-mentioned formula 2.
Second step：Calculate diameter of axle Breadth Maximum mmax
mmax=Hmax-2kmin=27.05-2 × 2.137=22.776 (mm)
3rd step：Calculate L0
According to above-mentioned formula 3.
4th step：Calculate grinding wheel width L
L=(L0+mmax)/2=(25.173+22.776)/2=23.97 (mm)
Therefore, the optimal grinding wheel width of the grinding Fig. 8 undercut groove diameter of axle is 23.97mm, sees Fig. 9.If emery wheel both sides are repaired R0.5 fillets, then 23.97mm refer to the effective width of emery wheel, see Figure 10.
Figure 11 shows the flow of the present invention.
The optimum width from emery wheel can accurately be calculated by adopting technical scheme, exclude the blindness of select grinding wheel Property efficiently solve bent axle in process because abrasive grinding wheel width select it is improper the undercut groove fillet that frays that easily causes Or boss problem is left on the diameter of axle.
Embodiments of the present invention are described in detail above in association with drawings and examples, but the present invention is not limited to Described embodiment.For a person skilled in the art, without departing from the principles and spirit of the present invention, These embodiments are carried out with various change, modification, replacement and modification to still fall within the scope of the present invention.

Claims (4)

1. a kind of computational methods for being ground fillet rolling crankshaft grinding wheel width, comprise the following steps：
Step 1 sets crankshaft parameters；If a width of H of the shelves of main shaft or connecting rod neck, the radius of undercut groove is R, and the depth of undercut groove is H, the width of undercut groove is k, and main shaft or connecting rod journal width are m, and undercut groove relief angle is β, and the recessed depth in undercut groove side is δ, Wherein H, R, h, δ are labeled with tolerance；
Step 2 calculates the width k of undercut groove according to the depth h of undercut groove；
(1) as h >=R-R.cos β, width k=R+R.sin β+cot β [h- (R-R.cos β)]-δ of undercut groove；
(2) as h ＜ R-R.cos β, the width of undercut groove
Step 3 is according to the depth h for corresponding to undercut groovemin, calculate the minimum widith k of correspondence undercut groovemin；
When R, h take minimum value, δ to take maximum, k values are minimum, i.e.,：
(1) h is worked asmin≥Rmin-Rmin.cos during β,
kmin=Rmin+Rmin.sinβ+cotβ[hmin-(Rmin-Rmin.cosβ)]–δmax... ... ... formula is 1.
(2) h is worked asmin＜ Rmin-Rmin.cos during β,
Step 4 does not stay boss grinding wheel width most after calculating wheel grinding according to main shaft or connecting rod journal width m is calculated on the diameter of axle Small value L；
M=H-2k, mmax=Hmax-2kmin, in order that not staying boss after wheel grinding on the diameter of axle, then grinding wheel width L must expire Sufficient L >=mmax=Hmax-2kmin；
Step 5 calculates the grinding wheel width maximum L for being ground to undercut groove fillet0；
When H, δ, h take minimum value, R to take maximum, at this moment emery wheel is just ground to the grinding wheel width L of undercut groove fillet0It is emery wheel choosing Select the maximum of width
Step 6 determines grinding wheel width L number ranges；
Grinding wheel width L span is：mmax≤L≤L0。
2. the computational methods of grinding fillet rolling crankshaft grinding wheel width according to claim 1, it is characterised in that：The step Rapid 3, step 4, formula described in step 5 1., formula 2., formula 3. in take δmaxOr δminEqual to zero.
3. the computational methods of grinding fillet rolling crankshaft grinding wheel width according to claim 1 or 2, it is characterised in that：Institute State step 6 medium plain emery wheel width L=(L0+mmax)/2。
4. the computational methods of grinding fillet rolling crankshaft grinding wheel width according to claim 3, it is characterised in that：The sand Wheel width L refers to remove the effective width after emery wheel fillet.
CN201710228399.2A 2017-04-10 2017-04-10 It is ground the computational methods of fillet rolling crankshaft grinding wheel width Pending CN107016195A (en)

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Application Number Priority Date Filing Date Title
CN201710228399.2A CN107016195A (en) 2017-04-10 2017-04-10 It is ground the computational methods of fillet rolling crankshaft grinding wheel width

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1442344A (en) * 1973-10-13 1976-07-14 Brown Tractors Ltd Method of treating crankshafts
CN101560664A (en) * 2008-04-14 2009-10-21 滨州海得曲轴有限责任公司 Nitridized and undercut fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft
DE102009006790A1 (en) * 2009-01-30 2010-08-05 Gerhard Deschler Method for manufacturing crankshaft of internal combustion engine, involves bringing roughness depth with range of stop collar up to groove edge on nominal dimension, where ground radius of grinding disk is smaller than transition radius
CN102126109A (en) * 2010-12-30 2011-07-20 东风汽车股份有限公司 Method for machining thrust surface of forged steel fillet quenching crankshaft
CN103194586A (en) * 2012-01-05 2013-07-10 广西玉柴机器股份有限公司 Crankshaft quenching strengthening method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1442344A (en) * 1973-10-13 1976-07-14 Brown Tractors Ltd Method of treating crankshafts
CN101560664A (en) * 2008-04-14 2009-10-21 滨州海得曲轴有限责任公司 Nitridized and undercut fillet rolling and reinforcing technology of normalized nodular cast iron crankshaft
DE102009006790A1 (en) * 2009-01-30 2010-08-05 Gerhard Deschler Method for manufacturing crankshaft of internal combustion engine, involves bringing roughness depth with range of stop collar up to groove edge on nominal dimension, where ground radius of grinding disk is smaller than transition radius
CN102126109A (en) * 2010-12-30 2011-07-20 东风汽车股份有限公司 Method for machining thrust surface of forged steel fillet quenching crankshaft
CN103194586A (en) * 2012-01-05 2013-07-10 广西玉柴机器股份有限公司 Crankshaft quenching strengthening method

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Application publication date: 20170804