CN106903492B - Engine link rises disconnected method processing technology - Google Patents
Engine link rises disconnected method processing technology Download PDFInfo
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- CN106903492B CN106903492B CN201710218956.2A CN201710218956A CN106903492B CN 106903492 B CN106903492 B CN 106903492B CN 201710218956 A CN201710218956 A CN 201710218956A CN 106903492 B CN106903492 B CN 106903492B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005516 engineering process Methods 0.000 title claims abstract description 23
- 230000000630 rising effect Effects 0.000 claims abstract description 32
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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Abstract
Rise disconnected method processing technology the present invention relates to a kind of engine link, its big end hole processed on connecting rod blank is circular hole, the connecting rod blank for being machined with big end hole is separated into gonnecting rod body and connecting rod cap two parts by rising by disconnected mode, the involutory surface of gonnecting rod body and connecting rod cap is the not machined section that rises, the connection positioning between gonnecting rod body and connecting rod cap is realized by the intermeshing between gonnecting rod body and the involutory surface of connecting rod cap, connecting rod cracking device for connecting rod cracking includes Vertical Rack and the workbench that is mounted on the Vertical Rack, it further include upper head and lower head, on described, it is respectively equipped on lower head, lower wedge piece and for driving corresponding wedge piece to move up and down, under rise disconnected thrust mechanism, by upper, lower wedge piece is because moving towards the extruding force to be formed for connecting rod cracking.Method of the invention reduces the disconnected difficulty that rises, and ensure that the quality of connecting rod of having no progeny that rises, reduces production process and manufacturing cost, with good economic efficiency.
Description
Technical field
The present invention relates to a kind of processing technology of engine link, in particular, be it is a kind of using rise disconnected method will even
Bar (blank) is separated into gonnecting rod body and the two-part Machining of Connecting Rod process of connecting rod cap, and it is each to be adapted to 484 water-cooled diesel engines etc.
The manufacture processing of kind connection rod of automobile engine and other similar workpiece.
Background technique
Connecting rod is the important part in automobile engine, it is connected to piston and crankshaft, and effect is by the reciprocal of piston
Movement is changed into the rotary motion of crankshaft, and the power acted on piston is transmitted to crankshaft with output power.Connecting rod at work,
In addition to bearing the pressure that combustion chamber combustion gas generates, the inertia force of vertical and horizontal is still suffered from.Therefore, connecting rod is complicated at one
It works under stress state.Its not only by the tension and compression stress of alternation but also by bending stress.The main damage forms of connecting rod are fatigue fractures
And excessive deformation.The position of usual fatigue fracture is three high stress areas on connecting rod.The operating condition of connecting rod requires to connect
Bar intensity with higher and anti-fatigue performance；Enough rigidity and toughness are required again.The reliability of engine is very big
The degree of reliability of connecting rod is depended in degree, division face quality is with positioning relation among the factor of the assembly reliability of connecting rod
Principal element, therefore the orientation problem between gonnecting rod body and connecting rod cap is resolved, the production cost of connecting rod can be reduced, hair is improved
The reliability of motivation.But since the shape of connecting rod is more complicated, is easily deformed, poor rigidity, dimensional accuracy, position precision and table
Face quality etc. is more demanding, has in manufacture and acquires a certain degree of difficulty.And the quality of its connecting rod manufacturing technology directly affects connecting rod
The quality of service performance and economic performance and diesel engine, with the development of production technology, traditional manufacturing technology gradually cannot
Adapt to the requirement produced now.
Connecting rod blank is separated by gonnecting rod body and connecting rod cap two parts using the process of chopping in the processing of existing connecting rod, is mainly related to
And following several critical process processes:
(1) big end hole roughing: processing the big end hole of ellipse rather than circular big end hole on connecting rod blank, with
It reserves the thickness for cutting cutter and cuts the machining allowance at back link body and lid parting plane.Since the big end hole of blank needs
Heavy boring processing is carried out on two stations, processes two half of circles respectively, and is discontinuously to process, therefore shake big, cutter mill
Damage is fast, cutter consumption is big, machine failure rate is high；
(2) finish-milling gonnecting rod body and connecting rod cap screw face: the screw face of finish-milling gonnecting rod body and connecting rod cap.It is due to cutting connecting rod
Connection type is tightened by screw bolt and nut, nut is directly on the screw face of gonnecting rod body, and processing request is very strict, difficulty of processing
Greatly, at high cost such as the roughness Ras 3.2 in screw face of 484 water-cooled diesel engine gonnecting rod bodies, dimensional accuracy 20.5 ± 0.1, parallel
Degree 0.03.
(3) connecting rod is cut, gonnecting rod body and connecting rod cap two parts are formed: behind finish-milling gonnecting rod body lid screw face, using from centre
Sawed-off method makes connecting rod blank be divided into gonnecting rod body and connecting rod cap two parts, also to separate respectively to gonnecting rod body, lid after sawed-off
Face carries out Milling Process, and this processing same accuracy requires height, and difficulty is big, at high cost, such as 484 water-cooled diesel engine connecting rods need to protect
Demonstrate,prove roughness Ra 1.6 and the position degree 0.2 etc. of parting plane.
(4) connecting rod bolt holes: the machining accuracy in order to guarantee connecting rod bolt holes are processed, in gonnecting rod body and connecting rod cap parting plane
After progress Milling Process reaches permissible accuracy, then the bolt hole of accurate processing gonnecting rod body, lid connection, the assembly of gonnecting rod body, lid
The position portion of location hole and bolt of the positioning in two bolts hole cooperates to position, these bolt hole required precisions are all very tight
Lattice are all not easy to guarantee in processing, such as the bolt hole roughness requirements Ra1.6 of 484 water-cooled diesel engine connecting rods, gonnecting rod body bolt
Pore size and toleranceThe size and tolerance in connecting rod cap bolt hole
The verticality 0.04 in the separated face of bolt hole and the center carpenters square cun 66.2 ± 0.05 of two bolts hole.Scale error will lead to company
There is residual stress to stay in connecting rod ASSY after the body of rod and connecting rod cap assembly, the two sides of connecting rod ASSY and the finishing of size head bore finish
Afterwards, it to be sent on engine line and be assembled with crankshaft, at this moment to dismantle connecting rod cap and gonnecting rod body, discharge residual stress, this meeting
Cause big end bore deformation.When connecting rod cap and gonnecting rod body are again mounted on engine crankshaft, serious lead is deformed
Cause can not install.The bolt for cutting connecting rod plays a part of to position and connect, and guarantees gonnecting rod body and lid assembly back link big end hole not
Can axially and radially vibration, can guarantee that connecting rod preferably works within the engine.Since there is error, connecting rods for processing
Body, lid are difficult accurately to coincide after separating, it is possible to lead to the critical failures such as engine tile kilning, cracking connecting rod.
(5) cut back link processing and engine assembly connecting rod: gonnecting rod body lid parting plane and bolt hole after processing is completed,
Need to tighten on bolt, then accurately processing crank pin end pore guarantee big end hole circularity and to the center of small head bore away from and it is parallel
The parameters such as twisted.It in engine assembly, needs to unclamp connecting-rod bolts, gonnecting rod body lid is separated, puts bearing shell well, be mounted in crankshaft
On, then again by gonnecting rod body and lid by being coupled positioning with bolt, connecting rod nut is tightened.If bolt hole and bolt
Cooperation precision it is bad, will result in crank pin end pore dislocation the phenomenon that, influence the assembly and use of engine.
Summary of the invention
In order to overcome the drawbacks described above under the prior art, rise disconnected method the purpose of the present invention is to provide a kind of engine link
Processing technology reduces difficulty of processing and processing cost to reduce the required precision of machining, guarantees connecting rod quality.
The disconnected method processing technology the technical scheme is that a kind of engine link rises, processes on connecting rod blank
Big end hole be circular hole, the connecting rod blank for being machined with big end hole is separated into gonnecting rod body and connecting rod cap two by rising by disconnected mode
Point, the involutory surface of gonnecting rod body and connecting rod cap is the not machined section that rises, by the involutory surface of gonnecting rod body and connecting rod cap it
Between intermeshing realize the connection positioning between gonnecting rod body and connecting rod cap, realized using connecting rod cracking device described by rising
The connecting rod blank for being machined with big end hole is separated into gonnecting rod body and connecting rod cap two parts by disconnected mode, and the connecting rod cracking device includes
Vertical Rack and the workbench being mounted on the Vertical Rack, further include upper head and lower head, the upper head and lower machine
Head is mounted on the column of the Vertical Rack respectively with the movable connection method for allowing it to move up and down, and being respectively equipped with can
Its upper walking mechanism moved up and down and lower walking mechanism are driven, the upper head is located at the top of the workbench, under described
Head is located at the lower section of the workbench, is equipped with connecting rod positioning device on the workbench, the upper head be equipped with can on
The upper wedge piece of lower movement and the disconnected thrust mechanism of the rise that the upper wedge piece can be pushed to move down, the lower head are set
There is the lower wedge piece that can be moved up and down and the lower wedge piece can be pushed to move up down the disconnected thrust mechanism that rises, it is described
The tip of upper wedge piece downward, positioned at the top of the lower wedge piece, the tip of the lower wedge piece upward, the upper and lower wedge
The cross section of shape part is in rectangle, and opposite side is the tapered plane being parallel to each other between the upper wedge piece and lower wedge piece,
Other sides are vertical plane, and the connecting rod wait rise disconnected is fixed on the table, and two matched rise disconnected watt are placed in major part
It in hole and is attached to big end hole respectively to correspond respectively on the inner wall of connecting rod cap and gonnecting rod body, mobile upper and lower head makes upper and lower wedge shape
Part insertion two is risen between disconnected watt by the rectangular space in the disconnected watt inner rectangular slot pairing that rises and making upper and lower wedge piece, rising disconnected watt
With big end hole inner wall successively respectively close to or be adjacent to, by rising above and below, disconnected thrust mechanism pushes upper and lower wedge piece to move in opposite directions up and down
It is dynamic, by the extruding force of wedge piece by connecting rod cracking.
The mode that big end hole is processed on connecting rod blank can be that continuous cutting goes out circular big end hole on connecting rod blank,
It is preferred that carrying out the machining of big end hole using boring machine.
Bolt fastening usually can be used between the gonnecting rod body and connecting rod cap.
Preferably, mutual corresponding bolt hole, the bolt hole on the connecting rod cap are processed on the link body and the connecting rod cover
For the through-hole for not setting screw thread, the bolt hole on the gonnecting rod body is to set internal thread blind hole, processes position on the connecting rod cap
Screw face at bolt hole port does not have screw face on the gonnecting rod body.When fastening, by the involutory surface of gonnecting rod body and connecting rod cap
Pairing makes the convex-concave structure intermeshing broken and formed on parting surface of rising, then fastening is penetrated to the bolt of connecting rod cap with bolt
Hole, and screw threads for fastening is on the bolt hole of gonnecting rod body.
The bolt hole connects the location structure of positioning with can not set on the bolt for gonnecting rod body with connecting rod cap.
Material therefor is can be with C70S6BY high-carbon middle carbon microalloy pearlitic steel.
Rise it is disconnected before, can first be processed on the inner wall at left and right sides of big end hole left and right two it is symmetrical rise it is disconnected
Guiding groove forms the plane of disruption along the disconnected guiding groove that rises when rising disconnected.
The disconnected guiding groove that rises is preferably relative to the wedge shaped wedge shape of plane of disruption design plane mirror symmetry and cross section
Slot or cross section are in the rectangular channel of rectangle, and alleged plane of disruption design plane refers to should be from the plane according to design requirement connecting rod blank
Fracture.
The disconnected guiding groove that rises preferably is processed by the way of laser cutting.
Preferably, the left and right towards connecting rod body portion is imposed in the part on disconnected forward oriented link blank corresponding to connecting rod cap of rising
Symmetrical back pressure, back pressure and the size relationship for the disconnected power that rises are preferably 1:3-1:4.
Rise during breaking and/or rise and has no progeny and can blow away the metal powder grain that fracture generates to breaking joint gap blowing of rising.
Preferably, the disconnected mode that rises of connecting rod blank is will be inserted into rise disconnected watt in big end hole, and disconnected watt of the quantity of rising is multi-disc,
The connecting rod body portion (rise to have no progeny and belong to the part of gonnecting rod body) and connecting rod cover born against in the inner wall of big end hole (rises and has no progeny
Belong to the part of connecting rod cap) on, to the disconnected watt of outside disconnected thrust that rises imposed along connecting rod blank axis direction that rises, connecting rod body portion
Disconnected watt of the Impact direction of rising with connecting rod cover is on the contrary, design connecting rod blank under the guidance for the disconnected guiding groove that rises along the plane of disruption
Plane rises disconnected, and spreading speed (gonnecting rod body and connecting rod cap are in the relative moving speed for being kept completely separate moment) is preferably not less than 100mm/
s。
The connecting rod blank point that big end hole will be machined with by the disconnected mode that rises can be realized using connecting rod cracking device
From for gonnecting rod body and connecting rod cap two parts.
A kind of preferred connecting rod cracking device includes Vertical Rack and the workbench that is mounted on the Vertical Rack, is also wrapped
Head and lower head are included, the upper head and lower head are mounted on institute respectively with the movable connection method for allowing it to move up and down
It states on the column of Vertical Rack, and is respectively equipped with the upper walking mechanism and lower walking mechanism for being able to drive that it is moved up and down, it is described
Upper head is located at the top of the workbench, and the lower head is located at the lower section of the workbench, is equipped on the workbench
Connecting rod positioning device, the upper head are equipped with the upper wedge piece that can be moved up and down and the upper wedge piece can be pushed downward
The disconnected thrust mechanism of mobile rise, the lower head are equipped with the lower wedge piece that can be moved up and down and can push the hyposphene
Shape part moves up down the disconnected thrust mechanism that rises, the tip of the upper wedge piece downward, positioned at the top of the lower wedge piece, institute
State the tip of lower wedge piece upward, the cross section of the upper and lower wedge piece is in rectangle, the upper wedge piece and lower wedge piece
Between opposite side be the tapered plane being parallel to each other, other sides are vertical plane, will be fixed on work wait the disconnected connecting rod that rises
Make on platform, by two it is matched rise disconnected watt to be placed in big end hole and be attached to big end hole respectively correspond respectively to connecting rod cap and gonnecting rod body
Inner wall on, mobile upper and lower head makes upper and lower wedge piece insertion two rise between disconnected watt by the disconnected watt inner rectangular slot pairing that rises
In rectangular space and make upper and lower wedge piece, rise disconnected watt and big end hole inner wall successively respectively close to or be adjacent to, it is disconnected by rising above and below
Thrust mechanism pushes upper and lower wedge piece to move towards up and down, by the extruding force of wedge piece by connecting rod cracking.
Beneficial effects of the present invention are mainly manifested in:
(1) it due to separating gonnecting rod body and connecting rod cap using the disconnected mode that rises, is cut without being reserved on the big end hole of connecting rod blank
It operates on the thickness of tool and cuts the machining allowance at back link body and lid parting plane, be not necessarily to as elliptical aperture on two stations
Carry out heavy boring processing, eliminate because process oval big end hole exist vibration is big, tool wear is fast, cutter consumption is big, lathe therefore
The defects of barrier rate is high significantly simplifies the processing technology of big end hole, considerably reduces difficulty of processing and processing cost, simultaneously
Also it is effectively guaranteed the quality of big end hole；
(2) due to corresponding processing technology being omitted, especially because existing correlation adds without processing to the section that rises
The requirement of work technique is very strict, and difficulty of processing is big, at high cost, it is this it is technologic be reduced to processing bring greatly just
Benefit significantly reduces processing cost, and helps to ensure that product quality.
(3) due to being positioned not against bolt hole and bolt, the difficulty of processing of bolt hole is significantly reduced, and can be with
Threaded hole is arranged directly on gonnecting rod body to be bolted, without the processing screw face on gonnecting rod body, processing step is omitted,
And eliminate influence because of bolt hole and screw face mismachining tolerance to positioning.
(4) due to being carried out between gonnecting rod body and connecting rod cap by the intermeshing between gonnecting rod body and the section that rises of connecting rod cap
Connection positioning, without being processed to the section that rises, manufacturing procedure is omitted, avoids because parting plane mismachining tolerance is to product matter
The influence of amount, and can be at a fully engaged between the section that rises, advantageously ensure that alignment quality.Simultaneously as the section that rises is uneven,
The bonded area between connecting rod cap and gonnecting rod body is also increased, bearing capacity of the connecting rod ASSY after installation and anti-shearing is enhanced
Ability.
(5) since connecting rod cracking device used is equipped with upper and lower two heads, by the upper and lower wedge piece that is oppositely arranged because
The effect of lateral extrusion caused by moving towards up and down, while to corresponding respectively to the two of connecting rod cap and gonnecting rod body on big end hole inner wall
Part impose effect on the same line, size it is identical, it is contrary and in big end hole axial direction equal extruding force everywhere, no
Can only effectively realize it is disconnected to rising for connecting rod, and because axially upper all disconnected active forces that rises are balanced (in axial direction each for big end hole
The stress intensity of point is identical with displacement), avoid because axial upper stress and displacement it is unbalanced caused by unbalanced plastic deformation, guarantor
The quality for having demonstrate,proved the big end hole of connecting rod cap and gonnecting rod body again after pairing is conducive to the cooperation essence for improving crank pin end pore and crankshaft
Degree guarantees and improves the transmission performance between connecting rod and crankshaft, avoids unnecessary local excessive mill and loses, and then improves and start
The power performance of machine, prolongs the service life.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of connecting rod of the present invention；
Fig. 2 is the schematic diagram of rise wedge piece involved in disconnected device and the disconnected watt of mode of action in big end hole that rise of the invention, is
For the sake of display is clear, gap is depicted between each part；
Fig. 3 is overlook direction schematic diagram corresponding with Fig. 2；
Fig. 4 is the schematic diagram of the disconnected device of the invention that rises；
Fig. 5 is that a kind of the rise expansion of the cam curve profile in disconnected device in the disconnected thrust mechanism embodiment that rises of the present invention is shown
It is intended to.
Specific embodiment
In the following, the present invention will be further described in conjunction with Fig. 1-5.
The material of connecting rod selects: the common used material of engine link is 40Cr steel at present, since this material is in knot of tissue
Structure and performance, using disconnected method separation gonnecting rod body 1 and the connecting rod cap 2 of rising, the plane of disruption under the action of distracting force, plastic deformation compared with
Greatly, there is the situation that big end hole loses circle, interfere the implementation of disconnected method of rising.Connecting rod material used in the present invention is the micro- conjunction of C70S6BY high-carbon
Golden non-hardened and tempered steel, this steel, which not only can guarantee after forging is air-cooled, enough intensity, meets the needs of connecting rod service performance, and
And experiments verify that, it is in brittle fracture feature, and the plane of disruption has good nibble under the premise of guaranteeing tough integrated performance index
Conjunction property.Due to this characteristic of the plane of disruption, it is sufficient to realize the correspondence of 2 pairing of gonnecting rod body 1 and connecting rod cap, and accurate positioning, therefore
It does not need to position by bolt and bolt hole, it will be able to guarantee the precision of connecting rod in use, guarantee the plane of disruption secondary
It is functional when assembly, while this materials microstructure structure and mechanical property all improve very much, wherein tension than existing 40Cr
Intensity is increased to 900-1050N/mm by the 780-930N/mm of current material, can largely reduce the failure rate of connecting rod.
Connecting rod is made of gonnecting rod body 1 and 2 two parts of connecting rod cap (referring to Fig. 1), and being tightened together by screw 3, it is complete to be formed
Connecting rod, both ends are respectively equipped with big end hole 5 and small head bore, and wherein big end hole is used to connect the corresponding axle journal of crankshaft, big end hole 5 by
Half-round recessed on gonnecting rod body 1 and connecting rod cap 2 involutes, but based on the convenience in processing, can be first on connecting rod blank
Big end hole 5 is processed, connecting rod blank is then separated into connecting rod from 5 middle part of big end hole along the plane perpendicular to connecting rod axis direction
2 two parts of body 1 and connecting rod cap, to install crankshaft.
Process big end hole: the first heavy boring major part circular hole on connecting rod blank, the big end hole of connecting rod blank are no longer ellipses, and
It is circle, can be processed on a boring machine, and be continuous cutting metal, stable cutting does not shake, and can save cutter
Consumption, guarantee the service life of lathe.
It processes screw face: only processing the screw face of connecting rod cap, without processing screw face on gonnecting rod body, this save
One procedure saves cutter, equipment and cost of labor.
Processing bolt hole: the processing of bolt hole is easier than cutting connecting rod, since the involutory surface of gonnecting rod body and connecting rod cap (rises
Section) there is positioning action naturally, it no longer needs to be positioned with bolt, therefore the size tolerance requirements of bolt hole are wide, cooperates ruler
Very little and roughness requirements are relatively low, it is possible thereby to save processing cost, without processing for location fit on bolt
Saw tooth shaped structure.Furthermore it is also possible to do not have to nut, the tapping on the bolt hole of gonnecting rod body, by connecting rod cap spiral shell when assembly
Bolt is directly tightened on gonnecting rod body.
Processing is risen disconnected guiding groove: rise it is disconnected before need first to process the disconnected guiding groove 4 that rises and (be shown in Fig. 1 and have no progeny rising
The disconnected guide groove that rises restored through pairing again), it can be processed by the way of laser cutting, laser resonator output swashs
Light beam becomes the high light beam of power density after the reflection of the eyeglass in light-conducting system, aggregation, which passes through fiber optic cables
It is radiated at crank pin end pore break inside line with nozzle, metal molten is evaporated, forms laser grooving.By adjusting the poly- of laser
Collect point, pulse wavelength and power to control the depth and width of laser grooving.
Disconnected 4 width of guiding groove that rises is chosen as 0.3-0.6mm, depth 0.3-0.5mm.
Due to laser beam energy density height, process velocity is fast, and is partial operation, influences pole to non-laser irradiated site
Small, heat affected area is also just small, so the thermal deformation of workpiece is small, the influence to subsequent big end hole machined (right boring, honing) is just
Very little.
Rise and form stress concentration during breaking at the disconnected guiding groove 4 that rises, connecting rod is made to form convex-concave not along the disconnected guiding groove 4 that rises
The flat planar plane of disruption, the distribution of disconnected 4 shape of guiding groove that rises and the disconnected power that rises and the disconnected speed etc. that rises all affect breaking effect
With plane of disruption quality, the good disconnected effect that rises is to obtain a necessary condition of qualified products.Should be with plane of disruption design plane
Benchmark processes phase using the intersecting straight lines of plane of disruption design plane and big end hole inner wall as middle line respectively at left and right sides of a fat person
The disconnected guiding groove 4 that rises answered, the disconnected guiding groove 4 itself that rises should be horizontal using the structure relative to plane of disruption design plane mirror symmetry
Section can be wedge shaped, preferably to guide fracture to extend along plane of disruption design plane, and helps to reduce the required power of breaking that rises,
Cross section also can achieve similar effect in rectangle.
Orientation rises disconnected: rise it is disconnected not only load is applied with certain acceleration, to initial crack slot (rise disconnected guiding groove) into
Row fully draws to split and urge and splits, and crackle is made to orient Quick Extended along crackle slot, until gonnecting rod body 1 is separated with connecting rod cap 2, and
The connecting rod cap 2 after breaking separation that rises allows for accurately resetting, and nibbles completely at the lattice plane (rise section) of fracture with gonnecting rod body 1
It closes, after tightening bolt, the big end hole of connecting rod can be restored to the geometry state before fracture.In addition, during orientation rises disconnected,
On the one hand major part bore deformation must be limited, prevent it is unilateral fracture and shear off phenomenon of rupture, this requires the power of application is right
Claim uniformly release；Opposite direction linear motion can only occur for another aspect connecting rod body portion and connecting rod cover, i.e., along connecting rod blank
Axis move backward and separate, it is any relative rotation can all cause it is unnecessary plastic deformation and lead to gonnecting rod body 1 and connecting rod
Lid 2 can not be attached together normally, therefore it is required that rise disconnected device to active force two-part in connecting rod blank must be straight line it is reversed and
It is balanced everywhere, while the disconnected device that also requires to rise should sufficiently meet the disconnected speed that rises for generating fracture effect, experimental verification, spreading speed
When being not less than 100mm/s, fracture face quality is more stable.To be rapidly achieved this velocity amplitude, need to accelerate from 0 value rapidly
100mm/s is spent, generates enough explosive force in moment.The mechanism for forming this explosive force is gathered by " back pressure " balancing effect
Energy, then abrupt release at one end suddenly, so that the acceleration for reaching needs is straight, and releases powerful impact force.Back pressure
Release should be matched with the application for the disconnected thrust that rises, the abrupt release back being sufficiently applied on big end hole inner wall in the disconnected thrust that rises
Pressure, thus not only facilitates guarantee impact effect, also contributes to avoid the mistake applying the disconnected thrust that rises to big end hole inner wall
Cheng Zhong leads to plastic deformation and stress because of different parts discontinuity equalization.
The disconnected device that rises by the wedge piece (can be described as wedge) with certain degree of hardness applies thrust to the disconnected set that rises, and can pass through
Hydraulic cylinder drives wedge piece pull rod to move linearly along the axial direction of big end hole, during wedge piece moves axially, passes through wedge shape
The component perpendicular to moving direction that face generates forces disconnected cover in the direction in opening trend, thus to major part of rising in big end hole
Hole inner wall applies the powerful disconnected power that rises, and under the action of moment step load, and stress collection is formed at the disconnected guiding groove that rises of connecting rod
In, along rising, disconnected 4 direction of guiding groove is accurately broken, so that connecting rod blank moment is two parts by spreading, a part is gonnecting rod body
1, another part is connecting rod cap 2.In order to guarantee the required disconnected impact effect that rises, rise before breaking using connecting rod cap screw towards connecting rod cap
Part applies the back pressure along connecting rod blank axis, and by control adjustment back pressure and the disconnected power that rises, (the disconnected device that rises passes through wedge etc.
The active force being actively applied on big end hole inner wall) size relationship, good blasting effect is capable of forming, to obtain
The plane of disruption of function admirable, according to experimental verification, the size relationship of back pressure and the disconnected power that rises is preferably between 1:3-1:4
(containing end value).
During connecting rod cracking, a small amount of metal powder grain is had on parting surface and is not fallen off, will be set in big end hole
The blowing device of air blowing plug is opened, and parting surface is blown off.Gonnecting rod body 1 and connecting rod cap 2 are assembled up and carried out at first time timeliness
Reason, is then unclamping again and is blowing off for the second time its parting surface, to ensure that cross-sectional face is stable and cleans, carries out at second of timeliness
Reason, then reassembles gonnecting rod body and connecting rod cap.Ageing treatment can carry out at room temperature, and when can use the appropriateness between process
Between be spaced realize, aging time can be determined by experiment according to dissimilar material properties, by this processing mode, favorably
In eliminating widely distributed small plastic deformation adverse effect, gonnecting rod body 1 and connecting rod cap 2 (built-up crankshaft after pairing again are improved
Afterwards) two rise on disconnected parting surface between microcosmic convex-concave structure everywhere close coincide.
The disconnected device that rises has decisive influence to the disconnected effect that rises, and should ensure that the direction for the disconnected power that rises is along connecting rod blank axis side
To not generating the active force for deviateing the axis direction or the active force for deviateing the axis direction to gonnecting rod body 1 and 2 part of connecting rod cap
Resultant force and resultant force to guarantee the disconnected synchronous progress of rising of two sides, and do not occur reversing or reversing the trend, avoid generating corresponding away from being zero
Stress and plastic deformation, in the axial direction of big end hole (major part axially bored line and connecting rod blank axis intersect vertically), active force
Basis equalization is answered in distribution, is carried out with guaranteeing that the same side rises to break also to synchronize everywhere in big end hole is axially upper, is avoided generating corresponding
Stress and plastic deformation.
The present invention provides a kind of preferred connecting rod cracking devices can be realized simultaneously using the connecting rod cracking device
State requirement.
As shown in Fig. 4 and Fig. 2, Fig. 3 and Fig. 5, connecting rod cracking device provided by the invention includes Vertical Rack 61, lower head
62, workbench 66 and upper head 69, the upper head 69 and lower head 62 the flexible connection side to allow it to move up and down respectively
Formula is mounted on the column of the Vertical Rack 61, and is respectively equipped with the upper walking mechanism and downlink for being able to drive that it is moved up and down
Mechanism is walked, the upper head 69 is located at the top of the workbench 66, and the lower head 62 is located under the workbench 66
It is square, connecting rod positioning device is installed, the upper head 69 is equipped with the upper wedge piece 68 that can be moved up and down on the workbench 66
And the upper wedge piece 68 can be pushed to move down rise break thrust mechanism, the lower head 62 be equipped with can on move down
Dynamic lower wedge piece 67 and the lower wedge piece 67 can be pushed to move up down the disconnected thrust mechanism that rises, the upper wedge piece
Downward, positioned at the top of the lower wedge piece 67, upward, described wedge-shaped 68 under at lower wedge-shaped 67 tip at 68 tip
Opposite side is the tapered plane being parallel to each other between wedge piece 67, other sides are vertical plane, the microcephaly of each wedge piece
End can be in pointed shape, or horizontal plane shape end face, arc surfaced end face or any other suitable shape, each wedge piece and
The movable connection method that can use existing any suitable is moved up and down between head (head rack or head box) where it
It realizes, for example, setting is for limiting the guide parts such as guide rail that it is moved up and down, when work, the upper wedge piece 68 was moved downward,
Lower wedge piece 67 moves upwards, and sectional area increases, and squeezes two sides, to realize the disconnected purpose that rises.
Preferably, vertical guiding force column 16, the guiding of the upper wedge piece 68 are equipped on the upper and lower wedge piece
Force column 16 is located at the top of the upper wedge piece 68, and the guiding force column 16 of the lower wedge piece 67 is located at the lower wedge shape
The lower part of part 67 is respectively provided with the upper and lower guide sleeve 64 of the upper and lower wedge piece mobile guide on the upper and lower head,
The upper and lower guide sleeve 64 is respectively fitted over the outside of the guiding force column 16 of the upper and lower wedge piece, and respectively with it is described it is upper,
16 clearance fit of guiding force column of lower wedge piece can form protection to the wedge piece by the guiding force column 16 and make
With 16 top of guiding force column can mitigate abrasion equipped with idler wheel.
By the fit clearance being rationally arranged between guide sleeve and corresponding force column, allow wedge piece that there is certain transverse direction
Mobile capacity, to form lateral rise disconnected thrust and transverse shifting during rising disconnected, by connecting rod cracking.
Preferably, horizontal annular groove, the guiding of the upper and lower wedge piece are equipped in the upper and lower guide sleeve 64
It is respectively equipped with the annular protrusion for the annular groove being inserted into corresponding guide sleeve on force column 16, is consequently formed opposite to each wedge piece
In the limit up and down of respective guide sleeve 64, the section of the annular groove and annular protrusion is preferably in rectangle, the convex annular
The width risen is less than the width of the annular groove, to form the capacity for allowing wedge piece to move up and down relative to its guide sleeve 64,
Be equipped in the annular groove of the upper guide sleeve can by the annular protrusion on the guiding force column 16 of the upper wedge piece 68 to
The upper reset spring 65 above pushed away, interior be equipped with of the annular groove of the lower guide sleeve can be by the guiding stress of the lower wedge piece 67
The lower reset spring 65 that annular protrusion on column 16 pushes down on, not to connecting rod application rise disconnected power when, pass through the effect of spring 65
The pre-determined bit for realizing upper and lower wedge piece, when carrying out connecting rod cracking to the upper and lower wedge piece force, upper wedge piece 68 declines,
Lower wedge piece 67 rises, and rises and is returned to original position again under the action of spring 65 after the completion of breaking.
Preferably, the upper and lower reset spring 65 is all made of precompressed one or more disc spring (disc spring group), it is described on
Reset spring 65 is located at below the annular protrusion on the guiding force column 16 of the upper wedge piece 68, the lower reset spring 65
The upper surface of annular protrusion on the guiding force column 16 of the lower wedge piece 67.
Preferably, the disconnected thrust mechanism that rises above and below respectively includes upper and lower cam 63 and described for respectively driving
The disconnected driving device that rises above and below that upper and lower cam 63 rotates, the overhead cam 63 is located at the top of the upper wedge piece 68, with institute
The rotation connection of head 69 is stated, the upper end for being oriented to force column 16 or upper end installation of curved profile and the upper wedge piece 68
Idler wheel is in contact and imposes active force, and thus being formed with the upper wedge piece 68 with the upper wedge piece 68 is the upper of its driven member
Cam mechanism, the lower cam 63 are located at the lower section of the lower wedge piece 67, connect with the lower rotation of head 62, curve wheel
The wide idler wheel installed with the lower end of the guiding force column 16 of the lower wedge piece 67 or lower end is in contact and imposes active force, thus
The lower cam mechanism with the lower wedge piece 67 for its driven member is formed with the lower wedge piece 67, the upper and lower cam 63 is
It is preferred that facilitate installation and transmission, and be suitable for biggish thrust transmission using cylindrical edge cam, it is described rise above and below it is disconnected
Driving device can use the driving device using motor as power source, can also use any other suitable prior art,
It is preferred that use cylinder drive, to be better adapted to connecting rod cracking needs, forming sufficiently large moment rises disconnected thrust, described
It is the smooth linear of convex shaped for a central part that expanded view is used with the curved profile of driven member effect in upper and lower cam 63
(referring to Fig. 5), height of projection on contour line according under wedge piece interaction to crank pin end pore 5 rise it is disconnected require setting,
Stroke needed for wedge piece when meeting connecting rod cracking, thus during cam rotates a circle, when starting corresponding wedge piece
It is motionless, thrust is imposed to corresponding wedge piece when cam rotates near half cycle, upper and lower wedge piece is pushed to move in opposite directions respectively
Dynamic (upper wedge piece moves down, lower wedge piece moves up), by the mutual extrusion between two wedge piece tapered planes, forms in the horizontal direction
The horizontal thrust of the disconnected thrust that rises of (Chong Die with horizontal positioned connecting rod central axis), two wedge pieces is located on same level straight line
And it is equal in magnitude, contrary, 5 inner wall of crank pin end pore is respectively acting on corresponding to the part of connecting rod cap 2 and corresponds to connecting rod
The position of body 1 can guarantee due to the inclined-plane amplification (wedge shape of wedge piece usually can be using acute angle wedge shape) of wedge piece
The sufficiently large disconnected thrust that rises rises from the preset disconnected indentation, there that rises of big end hole 5 connecting rod disconnected, forms connecting rod cap 2 and gonnecting rod body 1 two
Point, then continue to rotate with cam, wedge piece retracts initial position under the action of respective reset spring 65 again, rises disconnected
Connecting rod cap 2 and gonnecting rod body 1 afterwards is no longer influenced by the thrust of wedge piece.It is understood that realize the above-mentioned course of work, it is described
On workbench 66 should there are the holes for allowing lower wedge piece 67 and lower head 62 other relevant portions to pass through, and connecting rod is in workbench
It is installed on 66 after fixing, big end hole 5 should be located on the corresponding position of the hole, and the axis of connecting rod should be located at upper and lower wedge piece
The disconnected thrust that rises position on.
Preferably, the connecting rod positioning device include for be inserted into small head bore positioning pin that connecting rod small end hole is positioned and
It is respectively used to keep off two backing pins at the nearly big end hole position in connecting rod shank two sides, big end hole preload is additionally provided on the workbench 66
Device, the big end hole pre-tightening apparatus includes at least two groups big end hole elastic force push rod, wherein one group of big end hole elastic force push rod is used for
Hole wall outside of the big end hole corresponding to 1 part of gonnecting rod body is withstood on, another group of big end hole elastic force push rod is corresponding for withstanding on big end hole
On the outside of the hole wall of connecting rod cover, the big end hole elastic force push rod is equipped with push-rod guide (such as push rod guide sleeve) to limit
Elastic force push rod can only be moved along its own axis, and the big end hole elastic force push rod is additionally provided with for pushing away what it was pushed away to top orientation
Power spring, big end hole thrust pre-tightening apparatus can suitably select the amount of force of connecting rod, and it is disconnected not influence rising for connecting rod, connecting rod
Rise and have no progeny, during wedge piece retracts original position, each elastic force push rod pushes connecting rod cap 2 and gonnecting rod body 1 respectively, and pairing exists again
Together, effectively to eliminate the microplasticity deformation risen on section, the convex-concave structure for making to rise on section can after re-assemblying
It preferably coincide, in addition, this big end hole pre-tightening apparatus, which can also play the connecting rod for being mounted on workbench 66, is auxiliarily fixed work
With.
Preferably, the connecting rod cracking device be additionally provided with it is matched with big end hole 5 and wedge piece rise disconnected watt 11, it is described to rise
Disconnected watt 11 of quantity is two, and the lateral surface for rising disconnected watt is in cylindrical, is preferably matched with the inner wall of big end hole 5,
Cylindrical surface may be typically less than and (be slightly less than) half of cylinder, reserve to rise two convenient between assembling work between disconnected watt 11
Away from described the medial surface for rising disconnected watt is plane and is equipped with vertically extending rectangular channel, and the rectangular channel is placed in the middle in the lateral direction
Setting, width are greater than the width of (being slightly larger than) described wedge piece.It is placed in crank pin end pore 5 in use, two are risen disconnected watt,
Its lateral surface is set to be bonded the position for corresponding to connecting rod cap 2 and gonnecting rod body 1 on 5 inner wall of crank pin end pore respectively, by walking above and below
Mechanism drives upper and lower head mobile, and upper and lower wedge piece insertion two is made to rise the rectangular channel formed after disconnected watt of rectangular channel pairing
It is interior, on the upper and lower wedge piece vertical plane opposite with tapered plane respectively close to or be adjacent to corresponding disconnected watt of square of rising
Shape slot slot bottom disconnected watt and is risen disconnected watt to rising and imposes appropriate pre- thrust to 5 inner wall of big end hole, in favor of reduce rise it is disconnected during
Unnecessary vibration or offset, during rising disconnected, wedge piece imposes thrust to its corresponding rises disconnected watt, and by rise disconnected watt to
The corresponding region of 5 inner wall of big end hole imposes thrust, passes through this power transmitting construction and mode, it is ensured that rise thrust during breaking
In the balanced or symmetrical of connecting rod corresponding region, guarantee synchronizing and rise disconnected in the axial direction, avoid because axial caused by asynchronous
Distortion and deformation, and then connecting rod cap 2 and gonnecting rod body 1 can be made to be bonded after re-assemblying more preferably, guarantee assembly precision.
Preferably, the center of the rectangular channel slot bottom is equipped with vertically extending arc guide groove 12, on the wedge piece with
The opposite vertical plane of tapered plane is equipped with vertically extending arc fin 15 corresponding with the arc guide groove 12, the arc
Shape guide groove 12 and the arc fin 15 cooperate, it is ensured that rise disconnected process linear movement and straight line stress.
Preferably, the nearly notch position of the two sidewalls of the rectangular channel be in abducent arc surfaced (i.e. and rectangular channel
Cross section intersection be arc), for example, 1/4 is arc-shaped, be additionally provided with air-jet device on the upper head 69 or lower head 62,
The air-jet device includes the air jet pipe 14 vertically extended from corresponding head, and the quantity of the air jet pipe 14 is preferably two,
It is located at the left and right sides of corresponding wedge piece, the air jet pipe 14 connects pressure gas source, the air jet pipe by connecting pipe
Connecting pipe between the pressure gas source is equipped with gas puff Z-pinch valve.By the arc surfaced in rectangle groove sidewall, rise when two
After disconnected watt pairing, the arc space that can accommodate air jet pipe is formed in the side wall apposition position of rectangular channel, it is possible thereby to by each side
Air jet pipe 14 is inserted into respectively in the arc space of corresponding side, and each air jet pipe is equipped with several axially distributed puff prots, described
Puff prot is towards outside (opposite side of nearly wedge piece side).
Preferably, the upper and lower head is separately mounted on the upper and lower head cantilever, the upper and lower head with it is described
The mode that column is flexibly connected is that the upper and lower head cantilever passes through sliding sleeve respectively or slide opening is socketed on the column, described
The screw drive mechanism equipped with driving device can be used in upper and lower walking mechanism, and the upper and lower head is on corresponding head cantilever
Mounting means can be to be fixedly connected, or allow it along the flexible connection of cantilever linear movement, when straight using allowing
When the flexible connection of line movement, the upper and lower head, which can be respectively set, is able to drive its walking in a horizontal state moved along place cantilever
Mechanism, furthermore it is also possible to the prior art using any suitable enables cantilever to rotate around column, so that head can be
It is moved on any direction, can arbitrarily adjust the spatial position of head.
It, can also on the workbench 66 as the another embodiment of connecting rod positioning device and big end hole pre-tightening apparatus
To be equipped with track, movable plate can be installed on the track, the movable plate is equipped with the device for fixing small end of connecting rod,
Such as the multiple positioning pins and/or locating piece etc. of suitable way distribution, the movable plate is additionally provided with pre-tightening apparatus, rise it is disconnected before
Size according to connecting rod etc. adjusts the position of movable plate, and movable plate is fixed on a suitable position by the pre-tightening apparatus,
When connecting rod cracking, the small end of connecting rod can move along a straight line along connecting rod axis direction together with the movable plate, pass through work as a result,
Movable plate and corresponding location structure and the pre-tightening apparatus being mounted on movable plate, and cooperate sliding of the movable plate on workbench 66,
Realize that installation of the connecting rod on workbench 66 is fixed and the pairing again of connecting rod cap and gonnecting rod body of having no progeny that rises.
Preferably, the movable plate is equipped with automatic resetting device, after the completion of connecting rod cracking, movable plate drive small end of connecting rod from
Dynamic return realizes the engagement again after breaking of rising, and thus obtains the firm plane of disruption.
Preferably, the air jet pipe 14 and it is described accommodate air jet pipe space it is each there are two, in apposition position connecting rod axis pair
Two air jet pipes are arranged in the position of title, and from two sides, jet guarantees that the clast in entire crank pin end pore can be dried only.
Originally rise each electricity consumption part of disconnected device can be uniformly controlled by control cabinet, can be real by the way of any suitable
The disconnected device each section that now rises orderly synergistically works, these control modes and the control problem that may relate to can foundations
The prior art is realized, is repeated no more.
The present invention has following clear superiority compared with the traditional processing mode of cutting parting plane:
(1) processing of the faying face of connecting rod cap and gonnecting rod body is saved；
(2) gonnecting rod body and the processing in connecting rod cap bolt hole are relatively easy；
(3) cracking connecting rod that rises does not need nut, and screw thread is directly processed on gonnecting rod body, when reducing nut part and installation
Between；
(4) the rough section that rises increases the area of the faying face of connecting rod cap and gonnecting rod body, enhances connecting rod in this way
Bearing capacity and anti-shear ability of the assembly after installation；
(5) gonnecting rod body and connecting rod cap are assembled by the section combination of rising of self-assembling formation, not only repeatable accuracy and positioning accuracy
Good, the precision (circularity, cylindricity) of the form tolerance of crank pin end pore is also kept as；
(6) connecting-rod bolts are not playing the role of positioning, and the processing of bolt is relatively easily many, reduce the purchase cost of bolt；
(7) a large amount of cutter expense and die cost are saved；
(8) reduce process and lathe, reduce equipment operator；
(9) pass through statistics and calculate: compared with cutting Machining of Connecting Rod method, laser rise disconnected technology can save machine tool throw
Money 5% reduces machining processes 50%-60%, reduces production cost 5%-20%；
It is disclosed by the invention it is each preferably with optional technological means, unless otherwise indicated and one preferably or can selecting technology hand
Section is that further limiting for another technological means is outer, can form several different technical solutions in any combination.
Claims (10)
- The disconnected method processing technology 1. a kind of engine link rises, it is characterised in that the big end hole processed on connecting rod blank is circle The connecting rod blank for being machined with big end hole is separated into gonnecting rod body and connecting rod cap two parts, gonnecting rod body and company by rising by disconnected mode by hole The involutory surface of bowl cover is the not machined section that rises, real by the intermeshing between gonnecting rod body and the involutory surface of connecting rod cap Connection positioning between existing gonnecting rod body and connecting rod cap will be machined with using connecting rod cracking device realization is described by the disconnected mode that rises The connecting rod blank of big end hole is separated into gonnecting rod body and connecting rod cap two parts, and the connecting rod cracking device includes Vertical Rack and installation Workbench on the Vertical Rack further includes upper head and lower head, and the upper head and lower head are respectively to allow it The movable connection method moved up and down is mounted on the column of the Vertical Rack, and is respectively equipped with and is able to drive it and moves up and down Upper walking mechanism and lower walking mechanism, the upper head is located at the top of the workbench, and the lower head is located at the work Make the lower section of platform, connecting rod positioning device is installed on the workbench, the upper head is equipped with the upper wedge shape that can be moved up and down Part and the disconnected thrust mechanism of the rise that the upper wedge piece can be pushed to move down, the lower head are equipped with and can move up and down Lower wedge piece and the lower wedge piece can be pushed to move up down the disconnected thrust mechanism that rises, the tip of the upper wedge piece Downward, positioned at the top of the lower wedge piece, upward, the cross section of the upper and lower wedge piece is equal at the tip of the lower wedge piece In rectangle, opposite side is the tapered plane being parallel to each other between the upper wedge piece and lower wedge piece, other sides are vertical Straight plane, the connecting rod wait rise disconnected is fixed on the table, two matched rise disconnected watt are placed in big end hole and are attached to respectively Big end hole corresponds respectively on the inner wall of connecting rod cap and gonnecting rod body, and mobile upper and lower head makes upper and lower wedge piece insertion two rise disconnected watt Between by the rectangular space in the disconnected watt inner rectangular slot pairing that rises and make upper and lower wedge piece, rise disconnected watt and big end hole inner wall according to It is secondary respectively close to or be adjacent to, push upper and lower wedge piece to move towards up and down by the disconnected thrust mechanism of rising above and below, pass through wedge piece Extruding force by connecting rod cracking.
- 2. processing technology as described in claim 1, it is characterised in that the mode for processing big end hole on connecting rod blank is even Continuous cutting goes out circular big end hole on bar blank.
- 3. processing technology as described in claim 1, it is characterised in that bolt fastening is used between the gonnecting rod body and connecting rod cap, Mutual corresponding bolt hole is processed on the link body and the connecting rod cover, and the bolt hole on the connecting rod cap is not set leading to for screw thread Hole, the bolt hole on the gonnecting rod body are to set internal thread blind hole, are processed at bolt hole port on the connecting rod cap Screw face, there is no screw face on the gonnecting rod body.
- 4. processing technology as claimed in claim 3, it is characterised in that do not set for connecting on the bolt hole and the bolt The body of rod connects the location structure of positioning with connecting rod cap.
- 5. processing technology as described in claim 1, it is characterised in that material therefor is C70S6BY high carbon microalloy Micro Alloying Steel.
- 6. the processing technology as described in claim 1,2,3,4 or 5, it is characterised in that rise it is disconnected before, first in big end hole or so The symmetrical disconnected guiding groove that rises in left and right two is processed on the inner wall of two sides, forms the plane of disruption along the disconnected guiding groove that rises when rising disconnected.
- 7. processing technology as claimed in claim 6, it is characterised in that the disconnected guiding groove that rises is flat relative to plane of disruption design The wedge shaped wedge groove or cross section of face mirror symmetry and cross section is in the rectangular channel of rectangle.
- 8. processing technology as claimed in claim 7, it is characterised in that the disconnected guiding groove that rises is added by the way of laser cutting Work.
- 9. processing technology as claimed in claim 6, it is characterised in that correspond to the portion of connecting rod cap on the disconnected forward oriented link blank that rises It gives so that towards the symmetrical back pressure of connecting rod body portion, back pressure and the size relationship for the disconnected power that rises are 1:3-1:4, are risen During disconnected and/or rise and have no progeny to breaking joint gap blowing of rising, blows away the metal powder grain that fracture generates.
- 10. processing technology as claimed in claim 9, it is characterised in that the spreading speed that connecting rod blank rises disconnected is not less than 100mm/ s。
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| CN107740004A (en) * | 2017-10-23 | 2018-02-27 | 浙江跃进机械有限公司 | The manufacture method of Stainless-steel fibre aluminum connecting rod |
| CN108167315A (en) * | 2017-11-22 | 2018-06-15 | 中国北方发动机研究所(天津) | A kind of the connecting rod blank structure and connecting rod method for processing fractured of the swollen disconnected position of controls connecting rod |
| CN109434389A (en) * | 2018-12-07 | 2019-03-08 | 安徽江淮汽车集团股份有限公司 | A kind of disconnected processing method that rises of engine link |
| CN110497164B (en) * | 2019-08-29 | 2021-09-17 | 宁波嘉鹏机械设备制造有限公司 | Machining process of driving link rod in thermoplastic forming equipment |
| CN111120260B (en) * | 2019-12-18 | 2021-10-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Machining method of double-support frame, double-support frame and piston compressor |
| CN113634780A (en) * | 2021-09-13 | 2021-11-12 | 山西柴油机工业有限责任公司 | Control method for ovality of large end hole of connecting rod part of high-power diesel engine |
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