CN100566919C - Technique for processing connecting rod bearing shell - Google Patents
Technique for processing connecting rod bearing shell Download PDFInfo
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- CN100566919C CN100566919C CNB2008101393943A CN200810139394A CN100566919C CN 100566919 C CN100566919 C CN 100566919C CN B2008101393943 A CNB2008101393943 A CN B2008101393943A CN 200810139394 A CN200810139394 A CN 200810139394A CN 100566919 C CN100566919 C CN 100566919C
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- rod bearing
- outside circle
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Abstract
The invention discloses a kind of technique for processing connecting rod bearing shell.Technique for processing connecting rod bearing shell, it comprises the following steps with process sequence: cast blank, this blank need have the technology chuck; Weathering, with the open-air placement separately of described blank 50～70 days; Described blank is milled bearing shell into two, place in the workshop and carried out weathering in 35～45 days; Above-mentioned two half-watts are combined into an integral body by clip, rough turn inside and outside circle, made allowance 5～7mm; Rough mill a watt mouth; Weathering, placed 3 days separately in job shop; Half finish turning inside and outside circle; Half finish-milling watt mouth; At the described technology chuck groove of preapring for an unfavorable turn of events of getting on the bus, proofread and correct the finish turning inside and outside circle, machining accuracy IT8～IT5 cuts away the technology chuck; Bore the connecting rod bearing shell pilot hole, orthopedic then; Finish-milling Wa Kou and Wa Kou inclined-plane.The invention provides the processing technology that has long service life, makes the high connecting rod bearing shell product of toggle running accuracy.
Description
(1) technical field
The present invention relates to a kind of technique for processing connecting rod bearing shell, special, relate to the kinematic accuracy that satisfies various crank connecting link transmissions and the processing technology of the connecting rod bearing shell in service life.
(2) background technology
At present, various crank linkage driving systems are widely used in industries such as automobile, Aeronautics and Astronautics, household electrical appliances, especially occupy critical role in auto industry and Aero-Space manufacturing industry.Connecting rod bearing shell is the coupling part that is in piston lever and bent axle, rises to connect and supporting role, and its effect is similar with bearing.As the connector of the member that runs up and the support member of bigger load, the machining accuracy of connecting rod bearing shell, with and the internal stress form, to the kinematic accuracy of crankshaft connecting mechanism, and service life have a main influence, and to decisive influence is arranged in service life of connecting rod bearing shell self.If connecting rod bearing shell machining accuracy and internal stress form are unreasonable, the working face that causes connecting rod bearing shell, connecting rod bearing shell seat hole and bent axle easily has damage in various degree, crankshaft deformation, connecting rod bending even scrap when serious, and the connecting rod bearing shell seat loses circle.
The service life and the structure precision of connecting rod bearing shell directly determined by processing technology, and a few countries such as American-European at present and Japan have monopolized the high-end market of all connecting rod bearing shells, owing to blockade on new techniques, and China's external advanced processing technology of having no way of in this field learning.Just present China existing connection watt processing technology,---weathering---rough turn---check that the inclined-plane is holed, milled to half heavy boring------that it mainly comprises following operation: cast blank, its comprise one weathering, this operation mainly is to eliminate work hardening, eliminate internal stress, in following process, still work hardening can occur, if there is not this step, then must be that the mechanical performance that connects watt seriously descends; In addition, its machining only comprises rough turn and semi-finished heavy boring of roughing feed, be difficult to guarantee the machining accuracy of workpiece, and because connecting rod bearing shell is the accurate device that a kind of specification requirement is not less than 7 class precisions, existing processing technology is not owing to reach required machining accuracy, its coefficient of friction is bigger, and wearability is poor, service life in addition can not with year the meter.Though there is not gross imperfection, its microstructure is widely different, influences the transmission accuracy and the service life of toggle.In addition, manufacturing procedure is normally earlier the whole machine-shaping of connecting rod bearing shell at present, and then be cut to two half-watts, though this scheme process easily in middle operation because its finishing operation is the cold working operation of cutting two half-watts, be easy to cause half-watt malformation, even if increase orthopedic operation, also can't guarantee its orthopedic precision, and because this cutting two halves bricklayer preface, be easy to cause finished product internal stress situation complexity, flow harden is more serious.
(3) summary of the invention
The present invention is in order to overcome the defective that connects watt processing technology in the background technology, and the specific embodiment of the invention provides the processing technology that has long service life, makes the high connecting rod bearing shell product of toggle running accuracy.
According to the preferred embodiments of the present invention, provide following technical scheme:
Technique for processing connecting rod bearing shell, its process sequence is as follows:
A. cast blank, this blank need have the technology chuck;
B. weathering, with the open-air placement separately of described blank 50～70 days;
C. described blank is milled bearing shell into two, place in the workshop and carried out weathering in 35～45 days;
D. above-mentioned two halves bearing shell is combined into an integral body by clip, rough turn inside and outside circle, made allowance 5～7mm;
E. rough mill a watt mouth;
F. weathering, placed 3 days separately in job shop;
G. half finish turning inside and outside circle;
H. half finish-milling watt mouth;
I. at the described technology chuck groove of preapring for an unfavorable turn of events of getting on the bus, proofread and correct the finish turning inside and outside circle, machining accuracy IT8～IT5 cuts away the technology chuck;
J. bore the connecting rod bearing shell pilot hole, orthopedic then;
K. finish-milling Wa Kou and Wa Kou inclined-plane.
Above-mentioned technique for processing connecting rod bearing shell, it is 60r/min that the operation that described blank is milled bearing shell into two requires cutting speed, the amount of crossing feed t=2mm, length feed amount S=0.5mm/r; Milling surplus 0.2 ~ 0.3mm shaves out then.Described rough turn inside and outside circle operation rotating speed is 80r/min, the amount of crossing feed t=0.8mm, length feed amount S=0.5mm/r.Described half finish turning inside and outside circle operation adopts fixation workpiece one end, process non-clamping part, the part surface of clamping machined surface then, machine the described finish turning inside and outside circle operation amount of crossing feed t=0.5mm for the first time, when surplus also has 1mm, the car groove of preapring for an unfavorable turn of events, it is afterburning to adjust dress then, cooling, and then adjust clamping power, cut.Described cast blank operation adopts centrifugal precision-investment casting, requires blank cylindrical and hole not to have sand holes, shrinkage cavity, shrinkage porosite and hard spot defective.
Above-mentioned technique for processing connecting rod bearing shell describedly mills described blank into two bearing shell operation, rough turn inside and outside circle operation, process inspection all is set after rough milling a watt mouth operation, half finish turning inside and outside circle operation and finish turning inside and outside circle operation.
Processing technology is not simple operation stack, and the order of each inter process, and the setting of in-process work step and machined parameters are all influential to the quality of product, even have bigger influence.
The present invention is based on existing technique for processing connecting rod bearing shell of refinement and selection of process parameters thereof, guaranteeing to connect the precision and the internal stress form of watt finished product, and then guarantee the running accuracy and the service life of toggle, and the service life that connects watt self.Principle of Mechanical Designing has the selection of the quality of processing technology and process sequence and working procedure parameter that the instruction of direct relation is also arranged, processing technology is not the stack of simple process, the present invention then integrates existing processing technology, and then improve it, obtained required machining accuracy and guaranteed that its finished product is in the service life of toggle and the running accuracy and the service life of assurance toggle.
The present invention is behind casting process, carry out the weathering of 50～70 day long period, select for use fate to decide according to mean daily temperature and humidity, mean daily temperature height, high humidity, then can select the relatively short weathering time, can meet the demands in general 60 days, and the casting internal stress be eliminated as much as possible, to reduce the difficulty of following process.Finish the scheme of milling out again with respect to thick finish turning one cutter of original inside and outside circle, the present invention adopt earlier blank is milled open again rough turn, half finish turning, the finish turning operation break-down is finished, and with the Milling Process space, eliminated the machining deformation problem, the nature actual effect is set to eliminate the operation of internal stress, after the elimination workpiece machines, the distortion that produces because of inner stress of work is excessive, thereby guarantee the machining accuracy of connecting rod bearing shell, and then guarantee the transmission accuracy and the service life of toggle.Improvements of the present invention also are embodied in and now blank are milled blank into two, and then knot gets up to carry out following process, adjusting clip in the process gets final product, open clip at last and be finished product, do not have last cold working, can not produce additional flow harden, can not produce the machining deformation problem yet, the structure precision height, circularity is good.The groove of preapring for an unfavorable turn of events that wherein relates to is the cannelure of getting on the bus at the technology chuck, and part deformation amount during with minimizing turning is to guarantee the precision of turning processing.
(4) specific embodiment
This specific embodiment provides a kind of preferred technique for processing connecting rod bearing shell, and its process sequence is as follows:
A. cast blank, this blank need have the technology chuck;
B. weathering, with the open-air placement separately of described blank 50～70 days;
C. described blank is milled bearing shell into two, place in the workshop and carried out weathering in 35～45 days;
D. above-mentioned two halves bearing shell is combined into an integral body by clip, rough turn inside and outside circle, made allowance 5～7mm;
E. rough mill a watt mouth;
F. weathering, placed 3 days separately in job shop;
G. half finish turning inside and outside circle;
H. half finish-milling watt mouth;
I. at the described technology chuck groove of preapring for an unfavorable turn of events of getting on the bus, proofread and correct the finish turning inside and outside circle, machining accuracy IT8～IT5 cuts away the technology chuck;
J. bore the connecting rod bearing shell pilot hole, orthopedic then;
K. finish-milling Wa Kou and Wa Kou inclined-plane.
The above-mentioned weathering fate that relates to is selected, and what mainly consider is mean daily temperature and humidity, and in large-scale production, weathering mode is lower than heat treatment mode cost, in producing continuously, does not influence subsequent handling ground and carries out.Mainly consider the feed number and the depth of cut for rough turn inside and outside circle surplus, can meet the demands in above-mentioned scope.
In order to guarantee machining accuracy, need do strict restriction, especially fine finishining to the depth of cut and cutting speed.It is 60r/min that the operation that described blank is milled bearing shell into two requires cutting speed, the amount of crossing feed t=2mm, length feed amount S=0.5mm/r; Milling surplus 0.2～0.3mm is to prevent to press from both sides cutter.Shave out then.
Described rough turn inside and outside circle operation rotating speed is 80r/min, the amount of crossing feed t=0.8mm, length feed amount S=0.5mm/r.
Described half finish turning inside and outside circle operation adopts fixation workpiece one end, processes non-clamping part, and the part surface of clamping machined surface machines then.
In order to prevent to damage machined surface, the outer bowlder of finish turning, the clamping preferred tunable clip that connects watt blocks the clamping end, grabs the chuck clamping with four again, makes that to connect watt clamping end stressed even.Described finish turning inside and outside circle operation is the amount of crossing feed t=0.5mm for the first time, when surplus also has 1mm, and the car groove of preapring for an unfavorable turn of events, it is afterburning to adjust dress then, cooling, and then adjust clamping power, cut.
Described cast blank operation adopts precision-investment casting, requires blank cylindrical and hole not to have sand holes, shrinkage cavity, shrinkage porosite and hard spot defective.
Described blank is milled into two bearing shell operation, rough turn inside and outside circle operation, process inspection all is set after rough milling a watt mouth operation, half finish turning inside and outside circle operation and finish turning inside and outside circle operation.To guarantee the crudy behind these several procedures, for subsequent handling provides satisfactory middleware.
Claims (7)
1. technique for processing connecting rod bearing shell, its process sequence is as follows:
1) cast blank, this blank need have the technology chuck;
2) weathering, with the open-air placement separately of described blank 50～70 days;
3) described blank is milled bearing shell into two, place in the workshop and carried out weathering in 35～45 days;
4) above-mentioned two halves bearing shell is combined into an integral body by clip, rough turn inside and outside circle, made allowance 5～7mm;
5) rough mill a watt mouth;
6) weathering, placed 3 days separately in job shop;
7) half finish turning inside and outside circle;
8) half finish-milling watt mouth;
9) at the described technology chuck groove of preapring for an unfavorable turn of events of getting on the bus, proofread and correct the finish turning inside and outside circle, machining accuracy IT8～IT5 cuts away the technology chuck;
10) bore the connecting rod bearing shell pilot hole, orthopedic then;
11) finish-milling Wa Kou and Wa Kou inclined-plane.
2. technique for processing connecting rod bearing shell according to claim 1 is characterized in that: it is 60r/min that the operation that described blank is milled bearing shell into two requires cutting speed, the amount of crossing feed t=2mm, length feed amount S=0.5mm/r; Milling surplus 0.2～0.3mm shaves out then.
3. technique for processing connecting rod bearing shell according to claim 1 is characterized in that: described rough turn inside and outside circle operation rotating speed is 80r/min, the amount of crossing feed t=0.8mm, length feed amount S=0.5mm/r.
4. technique for processing connecting rod bearing shell according to claim 1 is characterized in that: described half finish turning inside and outside circle operation adopts fixation workpiece one end, processes non-clamping part, and the part surface of clamping machined surface machines then.
5. technique for processing connecting rod bearing shell according to claim 1 is characterized in that: described finish turning inside and outside circle operation is the amount of crossing feed t=0.5mm for the first time, when surplus also has 1mm, the car groove of preapring for an unfavorable turn of events is adjusted clamping power then, cooling, and then adjust clamping power, cut.
6. technique for processing connecting rod bearing shell according to claim 1 is characterized in that: described cast blank operation adopts centrifugal precision-investment casting, requires blank cylindrical and hole not to have sand holes, shrinkage cavity, shrinkage porosite and hard spot defective.
7. according to the described technique for processing connecting rod bearing shell of one of claim 1 to 6, it is characterized in that: described blank is milled into two bearing shell operation, rough turn inside and outside circle operation, process inspection all is set after rough milling a watt mouth operation, half finish turning inside and outside circle operation, finish turning inside and outside circle operation and finish-milling watt mouth operation.
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| CNB2008101393943A CN100566919C (en) | 2008-09-05 | 2008-09-05 | Technique for processing connecting rod bearing shell |
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| CNB2008101393943A CN100566919C (en) | 2008-09-05 | 2008-09-05 | Technique for processing connecting rod bearing shell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102528076A (en) * | 2010-12-13 | 2012-07-04 | 大连瑞谷科技有限公司 | Optimizing process for molding and processing oversized copper cage |
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| CN102259255A (en) * | 2011-03-23 | 2011-11-30 | 黄浩杨 | Method for machining tilting type bearing bush |
| CN102672441B (en) * | 2012-04-28 | 2014-06-04 | 重庆市江津区宏盛机械制造有限公司 | Light rail intermediate shaft machining process |
| CN102717232B (en) * | 2012-05-31 | 2014-05-28 | 中信重工机械股份有限公司 | Manufacturing method for half liner in head sheave of large-sized elevator |
| CN103264262B (en) * | 2013-05-24 | 2015-06-24 | 武汉群峰机械有限公司 | Machining technology of cam reinforcement lever mechanism |
| CN104646687A (en) * | 2014-06-21 | 2015-05-27 | 柳州凯通机械有限公司 | Aluminum piston machining method |
| CN104384874B (en) * | 2014-09-27 | 2017-10-20 | 安徽金庆龙机械制造有限公司 | A kind of processing technology of automobile engine crankshaft |
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| CN108381124B (en) * | 2018-02-28 | 2019-10-11 | 广汉天空动力机械有限责任公司 | A kind of process of highly-efficient processing burner inner liner floating wall tile fragment |
| CN111215753A (en) * | 2019-12-10 | 2020-06-02 | 北京航空航天大学 | Laser processing method for efficient high-precision polishing additive medical removable denture support |
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