CN103009020B - Manufacturing method for steel cracking connecting rod - Google Patents

Manufacturing method for steel cracking connecting rod Download PDF

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Publication number
CN103009020B
CN103009020B CN201210586143.6A CN201210586143A CN103009020B CN 103009020 B CN103009020 B CN 103009020B CN 201210586143 A CN201210586143 A CN 201210586143A CN 103009020 B CN103009020 B CN 103009020B
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rod
steel
cracking
casting
casting pig
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CN103009020A (en
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姜银方
龙昆
姜文帆
万鹏
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Jiangsu University
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Jiangsu University
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Abstract

The invention discloses a manufacturing method for a steel cracking connecting rod and belongs to the field of manufacturing of engine parts. According to the method, a preheated gray cast iron sheet is prearranged at a cavity at the joint of a connecting rod body and a connecting rod cover when a connecting rod blank is cast; during casting, the interface, contacted with molten steel, of the gray cast iron sheet is fused under the strong action of the molten steel; after condensation, the gray cast iron sheet is combined with steel in a metallurgical mode to manufacture a composite connecting rod blank; and when a cracking process is implemented, a connecting rod cracking groove is arranged in the middle of the gray cast iron sheet, brittle fracture separation of the connecting rod body and the connecting rod cover is realized by utilizing the brittle fracture of gray cast iron, and a natural three-dimensional concavo-convex structure on the fracture surface guarantees precise positioning and assembling of the connecting rod body and the connecting rod cover. By the manufacturing method for the steel cracking connecting rod, various common steel materials can be used for manufacturing the steel cracking connecting rod, the brittle fracture separation of the connecting rod and the connecting rod cover is realized at normal temperature, and the process of processing the combined surface by a mechanical grinding method is avoided, so that the manufacturing process is simplified and the manufacturing cost is reduced.

Description

A kind of manufacture method of steel cracking connecting-rod
Technical field
The invention belongs to engine component and manufacture field, be specifically related to a kind of manufacture method of steel cracking connecting-rod.
Background technology
Connecting rod is one of key components and parts of engine, bears high-frequency alternating load in its course of work, and therefore connecting rod must have sufficiently high intensity, rigidity and comprehensive mechanical performance.Conventional linkage adopts parts processing method, processes the faying face of gonnecting rod body and connecting rod cap, complete both attaching together after the dowel hole of fine finishining connecting rod cap and gonnecting rod body bolt hole after solid forging connecting rod blank by methods such as saw, milling, mills.Conventional method operation is various, and efficiency is low, product percent defective is high, and bearing capacity and quality stability are all poor.Therefore, cracking process technology becomes the new technology that connecting rod manufactures field most prospect gradually.
The inductile of cast connecting rod and the application of easy brittle failure pole appropriate lysis process technology, but cast connecting rod deviation of weight is large, and mechanical performance is poor, and fatigue strength is low, and its use is restricted.At present, cracking connecting-rod is the most widely used C70S6 high-carbon non-hardened and tempered steel being Germany and developing in producing, and France development SPLITASCO series high-carbon steel, this type of material cleavability is good, but yield strength is lower, and hardness is higher, and tool wear is fast, and material price is high.Domestic enterprise successively develops vanadium system, manganese vanadium system and manganese vanadium nitrogen system connecting rod non-hardened and tempered steel, typically has 38MnVS, 40MnV, 48MnV etc.But also there is a lot of problem in actual applications: excessive, the faying face of cracking back link big end hole distortion occurs that obviously dislocation, plane of disruption grain size do not reach engagement requirement, even have and split inextricable etc., these problems all limit the manufacture of high-quality cracking connecting-rod.
For controlling the fracture quality of steel connecting rod, improve cracking connecting-rod qualification rate, research at present on the cracking technology of steel connecting rod mainly concentrates on: (1) controls steel carbon-content, adds microalloy element Mn, S, Si, V, Cr, P etc., and regulates each component content to reach brittle failure requirement; (2) the cracking subdivision structure of connecting rod is optimized, and by Surface hardening treatment, to form the cracking face with grain boundary; (3) steel connecting rod is put into liquid nitrogen deep, to change material ductility, make it enter brittle state, realize the brittle failure subdivision of connecting rod; (4) adopt laser or plasma to irradiate steel con-rod fracture splitting district, make local become martensitic structure from austenite structure, realize connecting rod brittle failure and be separated.Above-mentioned technology all fundamentally can not solve the limitation of cracking technique to connecting rod material, cannot by medium carbon steel, and common forged steel etc. are applied to the manufacture of cracking connecting-rod.
Application number is 201210111187.3, name is called that the patent of " a kind of manufacture method of cracking type connecting rod " proposes to adopt the manufacture technics connecting rod artificially arranging cracking face in connecting rod blank, namely one deck particulate metal foil is set in mold cavity, its molten metal is reacted and forms brittle interface.There are the following problems for this technology: metal foil intensity is low, easily oxidized, if foil both sides metal bath surface rise inconsistent, to fill type not steady, foil is impacted large, the brittle interface then formed in foundry goods will out of position, maybe cannot form brittle interface, follow-up or cannot implement cracking subdivision.
Application number is 201210111190.5, and the patent that name is called " a kind of manufacture method of bimetal composite cracking connecting-rod " proposes: first cast gonnecting rod body and connecting rod cap, then pours into a mould cracking molten metal after detaching intermediate isolating plate, makes composite rod strand.The method is impractical in steel material, because steel material fusing point is high, and easy sticking to mould, and metal condensation is shunk and division board will be produced to very large coated power, division board detaches difficulty smoothly.
For overcoming above-mentioned patented technology Problems existing, the present invention proposes a kind of that casting pig sheet castingin is inner at steel connecting rod, during cast by the heat of molten steel by casting pig sheet and molten steel matrix material metallurgical binding, formation composite rod strand; When implementing cracking technology, the brittle failure of casting pig sheet is utilized to complete the cracking subdivision of gonnecting rod body and connecting rod cap.The manufacturing approach craft of the steel cracking connecting-rod that the present invention proposes is simple, easy to operate, low cost of manufacture.
Summary of the invention
The steel type that the object of the invention is for can be used for manufacturing cracking connecting-rod is at present few, occur when common forged steel, medium carbon steel cracking splitting not open, the cracking problem such as cross section deformation, crack branching, the method of castingin casting pig in a kind of steel connecting rod is provided, to solve the limitation of cracking technique to connecting rod selection, improve con-rod fracture splitting quality.
Based on this object, technical scheme of the present invention is: a kind of manufacture method of steel cracking connecting-rod, is characterized in that, during cast connecting rod blank, the casting pig sheet of preheating is preset in the connecting portion cavity place of gonnecting rod body and connecting rod cap; By the heat effect that molten steel is strong during cast, make the interface melting that casting pig sheet contacts with molten steel, after condensation, casting pig sheet is metallurgically combined with steel, makes composite rod blank; Then offer splitter in the gray cast iron material district of connecting rod, adopt cracking apparatus to make gonnecting rod body and connecting rod cap complete brittle failure subdivision in gray cast iron material district, utilize natural three-dimensional concave-convex structure on the plane of disruption to complete accurate location and the assembling of gonnecting rod body-lid.
A manufacture method for steel cracking connecting-rod, concrete steps are:
A) during cast connecting rod blank, the casting pig sheet 3 of preheating is preset in the connecting portion cavity place of gonnecting rod body 1 and connecting rod cap 2;
By the heat effect of molten steel when B) pouring into a mould, make the interface melting that casting pig sheet 3 contacts with molten steel, after condensation, casting pig sheet 3 is metallurgically combined with steel, makes composite rod blank;
C) diffusion annealing/normalized treatment;
D) the composite rod blank made more than or forge, Tempering and Quenching;
E) offer splitter 4 in the gray cast iron material district of connecting rod, make gonnecting rod body 1 and connecting rod cap 2 complete brittle failure subdivision in gray cast iron material district with cracking apparatus;
F) natural three-dimensional concave-convex structure on the brittle failure subdivision plane of disruption is utilized to complete accurate location and the assembling of gonnecting rod body-lid.
Connecting rod blank adopts sand casting, model casting, lost foam casting.
Gray cast iron material phosphorus content mass percent is 2.2 ~ 4.0%, and fusing point is 1100 ~ 1300 DEG C, and the casting pig sheet thickness inlayed is 0.1mm ~ 10mm.For increasing the bond strength of casting pig and mother metal, the casting pig sheet inlayed is made as and comprises front surface, the rear surface corresponding with front surface and four sides, wherein be cut with a through v-depression by the side directly contacting gonnecting rod body and connecting rod cap, or the side profile directly contacting gonnecting rod body and connecting rod cap is made zigzag structure.
In advance preheating is carried out to casting mold before casting, the casting pig that casting mold inside is inlayed fully is preheated to 400 ~ 900 DEG C, produce Interface Crack because of thermal stress and transformation stress when contacting with casting pig to avoid molten metal, thus improve the metallurgical binding quality at mother metal and casting pig interface.
The manufacture method of described a kind of steel cracking connecting-rod, it is characterized in that, described steps A), B) replace with, during cast connecting rod blank, first pour into a mould molten steel, at gonnecting rod body 1 when molten steel is condensed to half curdled appearance with connecting rod cap 2 die cavity place, pump dividing plate, cast casting pig molten iron, makes casting pig metallurgically be combined with steel, makes composite rod blank.
The composite rod blank more than made or carry out cracking technology processing again after forging.
The manufacturing process of cracking connecting-rod comprises: cast connecting rod blank; Diffusion annealing/normalizing; Forging; Tempering and Quenching; Process splitter, cracking subdivision and ressemble.
Beneficial effect of the present invention: (1) is at land castingin one deck casting pig of gonnecting rod body and connecting rod cap, utilize the inductile of casting pig, easily brittle failure sexual satisfaction con-rod fracture splitting process technology requirement, break through cracking technique to the limitation of connecting rod material, increase the range of choices of connecting rod material, reduce manufacturing cost, can by the weight precision controlling of connecting rod 1.5%.(2) implement cracking technology in the gray cast iron material district of connecting rod, reduce the cracking strength in cracking process, can effectively improve occur in con-rod fracture splitting process tear, split not open, fall the problems such as slag, plane of disruption dislocation, big end distortion.(3) employing model casting, lost foam casting complete the precision form of cracking connecting-rod, and its geometry, dimensional accuracy, close to connecting rod finished size, decrease processing charges, reduce tool wear and energy resource consumption.(4) reserve cutting surplus, faying face grinding allowance without the need to considering during bar linkage structure design, therefore bar linkage structure design simplification, bolt hole machining accuracy and cost reduce.
Accompanying drawing explanation
Fig. 1 is with the connecting rod schematic diagram of casting pig empiecement.
Fig. 2 connecting rod lost foam casting process flow chart.
Fig. 3 connecting rod investment casting formwork schematic diagram.
Fig. 4 connecting rod model casting flow chart.
In figure, 1 connecting rod cap, 2 connecting rod caps, 3 casting pig sheets, 4 splitters, 5 connecting-rod bolts, 6 rising heads, 7 sprues, 8 induction coils, 9 sand molds, 10 ingates, 11 screws, 12 connecting rod formworks.
Detailed description of the invention
Further illustrate technical scheme of the present invention below in conjunction with embodiment, but can not be interpreted as that these examples are the restrictions to technical scheme.
embodiment 1:
Embodiment 1 adopts lost foam casting process to manufacture connecting rod blank.Connecting rod main material selects medium carbon steel 40Cr, and it is moderate, and handling ease, after heat treatment can manufacture the connecting rod part bearing high load capacity, impact, and because its toughness is comparatively large, room temperature condition can not realize brittle failure cracking, can not be used for the manufacture of cracking connecting-rod.HT200 selected by casting pig, and its plasticity and toughness, far below steel, are easy to brittle failure subdivision, and its fusing point is 1145 ~ 1250 DEG C.
Fig. 2 is connecting rod lost foam casting process figure, and connecting rod is arranged vertically, and big end is down, head-up little, and gonnecting rod body 1, connecting rod cap 2 and running gate system ingate 10 adopt lost pattern, and rising head 6 and sprue 7 adopt the direct moulding of wooden model.During Casting mold manufacturing, first the mould of the polystyrene foam plastics mould of connecting rod is made, again with the foam mould of this Mold Making connecting rod, then a rectangular enclosure is offered at the gonnecting rod body 1 of the foam mould of connecting rod with the binding site of connecting rod cap 2, be used for casting pig sheet 3 is installed, ensure that the length of casting pig sheet 3 exceeds connecting rod cap 2 both sides 3 ~ 10mm; Then on foam mould, paste running gate system ingate 10 and apply fireproof coating, putting it into temperature is that the drying room of 50 DEG C is dried and pasted the overall evaporative pattern of completion; The overall evaporative pattern of drying is imbedded in dry sand, vibration frequency be 50 ~ 60HZ, amplitude is carry out jolt ramming in 1-2mm parameter area, and adopts wooden model directly to make rising head 6 and sprue 7, completes the making of evaporative pattern casting mold.
Casting pig sheet 3 adopts watery hydrochloric acid to clean in advance, and removing surface scale, and surface application one deck anti-oxidant protective agent outside, be then embedded in lost pattern gonnecting rod body 1 and connecting rod cap 3 connecting portion.Before casting, whole sand mold is put in induction coil, eddy-current heating is adopted to carry out preheating to connecting rod casting mold, in warm, foamed polystyrene pattern is heated vaporization, when casting pig sheet 3 is preheated to 300 ~ 800 DEG C, melted alloy molten steel is poured into casting mold, until rising head is filled, molten steel is with higher than its liquidus temperature 30 ~ 80 DEG C casting.After foundry goods cooling, sand mold entirety is hung out in induction coil, broken sand pickup.
By analysis of experiments, obtaining microstructure morphology from combination interface can find out, interface there occurs obvious metallurgical reaction, and casting pig sheet two layers of material is combined with mother metal closely, without obvious crackle and hole.When implementing cracking technology, first roughing crank pin end pore, offers splitter 4 in the middle of the casting pig 3 of big end, adopts cracking apparatus that gonnecting rod body 1 is completed with connecting rod cap 2 and is separated.The casting pig 3 inlayed in connecting rod during cracking shows excellent brittle failure, and big end bore deformation is little, section is formed canine tooth cross structure, can realize gonnecting rod body 1 and the locating surface of connecting rod cap 2, complete both accurately attaching together.Due to casting pig edge as, monolaterally when effectively decreasing con-rod fracture splitting to tear, split the problems such as inextricable, big end hole distortion.
embodiment 2:
Embodiment 2 adopts full form casting process to manufacture steel connecting rod blank.Connecting rod main material selects medium carbon steel 40Cr, and it is moderate, and handling ease, after heat treatment can manufacture the connecting rod part bearing high load capacity, impact, and because its toughness is comparatively large, room temperature condition can not realize brittle failure cracking, can not be used for the manufacture of cracking connecting-rod.HT200 selected by casting pig, and its plasticity and toughness, far below steel, are easy to brittle failure subdivision, and its fusing point is 1145 ~ 1250 DEG C.
Adopt full form casting process, first according to the connecting rod moulding that will manufacture, make the wax-pattern of connecting rod, and the gonnecting rod body 1 on connecting rod wax-pattern offers a rectangular enclosure with the connecting rod position of connecting rod cap 2, be used for casting pig sheet 3 is installed, and gate stick and ingate are bonded on connecting rod wax-pattern, make wax-pattern module.Casting pig sheet 3 will adopt watery hydrochloric acid clean before embedding wax-pattern, removes surface scale, and surface application one deck anti-oxidant protective agent outside, protective agent is boric acid or rare earth oxide; Casting pig sheet 3 is embedded into two ends after in wax-pattern and is screwed into low melting point screw 11 respectively, and screw 11 is stretched out wax-pattern outer wall 3 ~ 6mm; Then the mixture of upper refractory material waterglass or silicic acid glue and fine sand is dipped on connecting rod module surface, then mucilage, spill fire sand, ensure that surperficial layer of sand has 2 ~ 5mm thick; After its dry solidification, whole module is heated to 60 ~ 80 DEG C, the wax material melted is deviate from from cast gate, makes die housing 12, as shown in Figure 3; Before casting, die housing is heated to 700 ~ 900 DEG C, by melted steel alloy heat from sprue gate injection, molten steel is with higher than its liquidus temperature 30 ~ 80 DEG C casting.In being formed after condensation, the compound casting of castingin iron plate, manually shells and excises dead head.
By analysis of experiments, obtaining microstructure morphology from combination interface can find out, interface there occurs obvious metallurgical reaction, and casting pig sheet two layers of material is combined with mother metal closely, without obvious crackle and hole.When implementing cracking technology, first roughing crank pin end pore, offers splitter 4 in the middle of the casting pig 3 of big end, adopts cracking apparatus that gonnecting rod body 1 is completed with connecting rod cap 2 and is separated.The casting pig 3 inlayed in connecting rod during cracking shows excellent brittle failure, and big end bore deformation is little, section is formed canine tooth cross structure, can realize gonnecting rod body 1 and the locating surface of connecting rod cap 2, complete both accurately attaching together.Due to casting pig edge as, monolaterally when effectively decreasing con-rod fracture splitting to tear, split the problems such as inextricable, big end hole distortion.

Claims (4)

1. a manufacture method for steel cracking connecting-rod, is characterized in that, concrete steps are:
A) during cast connecting rod blank, the casting pig sheet (3) of preheating is preset in the connecting portion cavity place of gonnecting rod body (1) and connecting rod cap (2); The material phosphorus content mass percent of described casting pig sheet (3) is 2.2 ~ 4.0%, and fusing point is 1100 ~ 1300 DEG C, and described casting pig sheet (3) thickness is 0.1mm ~ 10mm, and described casting pig sheet (3) is through Nickel Plating Treatment;
By the heat effect of molten steel when B) pouring into a mould, make the interface melting that casting pig sheet (3) contacts with molten steel, after condensation, casting pig sheet (3) is metallurgically combined with steel, makes composite rod blank;
C) diffusion annealing/normalized treatment;
D) the composite rod blank made more than, Tempering and Quenching;
E) offer splitter (4) in the gray cast iron material district of connecting rod, make gonnecting rod body (1) and connecting rod cap (2) complete brittle failure subdivision in gray cast iron material district with cracking apparatus;
F) natural three-dimensional concave-convex structure on the brittle failure subdivision plane of disruption is utilized to complete accurate location and the assembling of gonnecting rod body-lid.
2. the manufacture method of a kind of steel cracking connecting-rod according to claim 1, is characterized in that, described connecting rod blank adopts sand casting, model casting or lost foam casting.
3. the manufacture method of a kind of steel cracking connecting-rod according to claim 1 and 2, it is characterized in that, the side of described casting pig sheet (3) contact gonnecting rod body and connecting rod cap is cut with a through v-depression, maybe zigzag is made in the side of contact gonnecting rod body and connecting rod cap.
4. the manufacture method of a kind of steel cracking connecting-rod according to claim 1, it is characterized in that, described steps A), B) replace with, during cast connecting rod blank, first pour into a mould molten steel, at gonnecting rod body (1) when molten steel is condensed to half curdled appearance with connecting rod cap (2) die cavity place, pump dividing plate, cast casting pig molten iron, makes casting pig metallurgically be combined with steel, makes composite rod blank.
CN201210586143.6A 2012-12-31 2012-12-31 Manufacturing method for steel cracking connecting rod Active CN103009020B (en)

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TWI665035B (en) * 2013-10-09 2019-07-11 國立大學法人東北大學 Semi-solidified casting and forging device and method, and casting and forging products
CN104923737A (en) * 2015-06-01 2015-09-23 含山县恒翔机械制造有限公司 Stopper of rear door of car
CN104985120A (en) * 2015-06-01 2015-10-21 含山县恒翔机械制造有限公司 Fabrication method of tail section of minicar exhaust pipe
CN104927152A (en) * 2015-06-01 2015-09-23 含山县恒翔机械制造有限公司 Wear-resistant cover plate for automobile chassis
CN105195673B (en) * 2015-10-14 2017-08-04 江苏大学 A kind of bimetallic is combined the investment casting method of cracking connecting-rod
CN105290743A (en) * 2015-12-01 2016-02-03 吉林大学 Method for cracking hardened and tempered forged steel connection rods
CN106994496B (en) * 2017-04-14 2018-12-14 江苏大学 A kind of forging method of steel bimetallic cracking connecting-rod
CN108080602A (en) * 2017-12-21 2018-05-29 南京航空航天大学 A kind of part blank nature cracking technology
CN111496195A (en) * 2020-04-26 2020-08-07 全椒康盛机电有限公司 Bimetallic investment casting process for automobile engine connecting rod

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CN101307796A (en) * 2007-12-21 2008-11-19 长春设备工艺研究所 High intensity alloyed steel linkage rod deep cooling embrittlement bulge-breaking process
CN102011791B (en) * 2010-08-24 2013-02-27 钟树平 Connecting rod of engine and making method thereof
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CN102626777B (en) * 2012-04-17 2014-10-29 江苏大学 Manufacturing method of composite double-metal cracking connecting rod
CN102626770B (en) * 2012-04-17 2014-08-20 江苏大学 Manufacturing method of splitting-type connecting rod

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