CN1123336A - Method for producing cast connecting rod of engine - Google Patents
Method for producing cast connecting rod of engine Download PDFInfo
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- CN1123336A CN1123336A CN 94116046 CN94116046A CN1123336A CN 1123336 A CN1123336 A CN 1123336A CN 94116046 CN94116046 CN 94116046 CN 94116046 A CN94116046 A CN 94116046A CN 1123336 A CN1123336 A CN 1123336A
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- connecting rod
- cast connecting
- manufacture method
- engine according
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Abstract
The mfg. method uses a specific formula of modifying agent and duplex smelting process and technological processes of surface precision-pressing and strong shot-blasting, etc. so as to make the link rod obtain the ideal chemical components and metallurgical structure, therefore said method raises the surface quality and service performance of the link rod, and also reduces its cost.
Description
The present invention relates to a kind of manufacture method of cast connecting rod of engine.
At present, the used engine link of state's intrinsic motivation all is to adopt steel alloy to forge to form, and the technical process of its connecting rod rough forging is: the check → antirust processing → warehouse-in of die forging on the inspection of raw and process materials → blanking → heating → roll forging blank → hot die forging press → side cut intermediate survey → forging postheat treatment → surface-conditioning → check → correction and pressure-sizing → at last.Though the product steady quality is reliable, processing characteristics is relatively poor, involves great expense.
The manufacture method of the cast connecting rod of engine that purpose of the present invention is exactly a kind of processing characteristics height of providing at above-mentioned deficiency of the prior art, cost is low.
The object of the present invention is achieved like this:
The manufacture method of cast connecting rod of engine, its technology is:
Cleaning → go-on-go → annealing → quenching → cleaning → tempering → Performance Detection → pressure-sizing → check → magnetic-particle inspection → x-ray inspection → powerful ball blast → check → antirust processing → warehouse-in.
Duplexing is adopted in the batching fusing: cupola furnace incipient melting foundry returns → electrosmelting of intermediate frequency → adjustment chemical ingredients → stokehold inoculation, and to guarantee the Chemical Composition of molten iron.
The cupola furnace just Chemical Composition of melt is C, Si, Mn, S, P, Cr.Its composition by weight (per-cent) is: C:2.7-3, Si:1.5-1.8, Mn:0.4-0.6, S:0.15, P≤0.1, Cr≤0.06.
The chemical ingredients of cast connecting rod is: C, Si, Mn, S, P, Cr, its composition by weight (per-cent) are C:2.4-2.6, Si:1.4-1.6, Mn:0.4-0.6, S:0.12, P≤0.1, Cr≤0.06.
Nucleating agent adopts rare earth magnesium, bismuth, copper, and its composition by weight (per-cent) is: rare earth magnesium: 0.2-0.3, and bismuth 0.01-0.03, copper 0.2-0.3.Copper can increase molten iron flowability, crystal grain thinning, improve graphite shape and distribution, improve fatigue strength and solidity to corrosion, by the stokehold inoculation, as cast condition easily forms spoken parts in traditional operas, and promote greying, the requirement of premium grads in the equal conformance with standard of every technical indicator of graphite during annealing.Matrix is granular and the fine-grannular sorbite after modified.
Adopt protective atmosphere, under nitrogen, carry out conventional thermal treatment, make surface not decarburization of not oxidation, and improve tensile strength.
Ball blast and pressure-sizing are strengthened in the surface,, improve safe range of stress, make cast connecting rod can bear the high repeated load of high speed and do not rupture to increase bearing stress.
Advantages such as the present invention has realized casting and forging, and the raw material sources of having given full play to casting are extensive, and technological flexibility is big, and the frock expense is few, and good processability is saved the machining expense, and comprehensive cost is low.
Below in conjunction with embodiment the present invention is further described.Embodiment: 213 automobiles are with I-4 cast connecting rod of engine (is example with certain stove).Technical process:
→ cleaning (knockout, go dead head, first tumbling) → go-on-go → annealing---→ quenchings → cleaning → tempering → Performance Detection---→ pressure-sizing → check (shape, size, weight, equal entirely) → magnetic-particle inspection → x-ray inspection → powerful ball blast → check → antirust processing → warehouse-in.
The cast connecting rod Chemical Composition: to cast connecting rod Chemical Composition (%) as follows: C2.50, Si 1.45, Mn 0.50, S 0.1, P 0.045, Cr＜0.05.
Adopt Hunter machine modeling and homemade automatic pug mixer mulling, new molding sand proportion: silica sand 100%, coal dust 4%, wilkinite 5%, water 4%.
Adopt the melting duplex practice.Cupola furnace incipient melting foundry returns, middle frequency furnace melting again, adjustment chemical ingredients (seeing Table 1), desulfurization and stokehold inoculation, compound inoculated agent prescription and treatment process see Table 2.When sulfur content of hot metal surpassed 12%, with sweetening agent (alkali face) desulfurization, molten iron temperature was 1450-1500 ℃ at that time, and the sweetening agent add-on is decided on the sulfur content size.
Thermal treatment process: in being filled with the electric furnace of protective atmosphere, carry out high temperature annealing.Be warmed up to 950 ℃, be incubated 18 hours, the air cooling of coming out of the stove after being cooled to 870 ℃.Quenching is heated to 870 ℃, is incubated 2.5 hours, the oil quenching of coming out of the stove, 40 ℃ of oil liquid temperatures.Tempering is heated to 650 ℃, is incubated 3.5 hours, the air cooling of coming out of the stove.The mechanical property σ b=710mpa of cast connecting rod, σ 0.5=595mpa, δ=3.8%, HB=249 after the thermal treatment.The graphite form that metallographic structure has reached JB2122-77 prescribed by standard more than 3 grades, distribute more than 2 grades, size and quantity is more than 3 grades.Matrix is fine-grannular sorbite tissue.
Pressure-sizing on smoothing press, shaping, die-cut major part rising head, the electric furnace heating is 460 ℃ before pressing.Single face pressure-sizing amount, two 0.25mm, the 0.4mm of bar portion.
On shot-blasting machine, use X-light defectoscope and magnetic-particle inspection machine testing subsurface defect and surface crack.
According to technology of the present invention, 213 cast connecting rods of production have passed through 500 hours stand long duration test, prove that homemade cast connecting rod performance is up to standard, can substitute import fully.
Table 1, the used metal charge Chemical Composition of 213 cast connecting rods
| Metal charge | Chemical ingredients (%) |
| ????C??????Si????Mn??????S????????P????????Cr | |
| Cupola furnace is melt connecting rod foundry returns steel scrap ferromanganese ferrosilicon just | ????2.97???1.64??0.6?????0.15?????0.09?????0.05 ????2.6????1.6???0.51????0.084????0.045????＜0.05 ????0.35???0.30??0.60????≤0.04???≤0.04???≤0.25 ?????????????????＞65????＜0.03???＜0.3 ???????????＞70??????????＜0.02???＜0.05 |
Table 2, compound inoculated agent prescription and treatment process
| The nucleating agent title | The trade mark | Prescription add-on (%) | Granularity (mm) | Breed Wen Wendu ℃ | Treatment process |
| Rare earth magnesium ferrosilicon alloy | FeSiMg 8RE 7 | 0.3 | 10 | Put FeSiMf earlier 8RE 7In casting ladle, molten iron is injected in the back.Treat that molten iron pours scarfing cinder in 3/5 o'clock of containing, add bismuth iron and copper then, add simultaneously and pour into a mould again after 2/5 molten iron is measured in containing. | |
| Bismuth ingot | Bi-1 | 0.03 | 7 | 1540 | |
| Copper | Cu-1 | 0.2 | Wire rod |
Claims (10)
1, a kind of manufacture method of cast connecting rod of engine is characterized in that its production technique is:
Cleaning → go-on-go → annealing → quenching → cleaning → tempering → Performance Detection → pressure-sizing → check → magnetic-particle inspection → x-ray inspection → powerful ball blast → check → antirust processing → warehouse-in.
2, the manufacture method of cast connecting rod of engine according to claim 1 is characterized in that cast connecting rod batching fusing employing duplexing: cupola furnace incipient melting foundry returns → electrosmelting of intermediate frequency → adjustment chemical ingredients → stokehold inoculation.
3, the manufacture method of cast connecting rod of engine according to claim 2 is characterized in that the Chemical Composition of the first melt of cast connecting rod is C, Si, Mn, S, P, Cr.
4, the manufacture method of cast connecting rod of engine according to claim 2 is characterized in that the composition by weight (per-cent) of the first melt of cast connecting rod is: C:2.7-3, Si:1.5-1.8, Mn:0.4-0.6, S≤0.15, P≤0.1, Cr≤0.06.
5, the manufacture method of cast connecting rod of engine according to claim 1 is characterized in that the chemical ingredients of cast connecting rod is: C, Si, Mn, S, P, Cr.
6, the manufacture method of cast connecting rod of engine according to claim 1 is characterized in that the composition by weight (per-cent) of cast connecting rod is C:2.4-2.6, Si:1.4-1.6, Mn:0.4-0.6, S:0.12, P≤0.1, Cr≤0.06.
7, the manufacture method of cast connecting rod of engine according to claim 2 is characterized in that the nucleating agent that adopts is: rare earth magnesium, bismuth, copper when carrying out the stokehold inoculation.
8, the manufacture method of cast connecting rod of engine according to claim 2 is characterized in that the composition by weight (per-cent) of nucleating agent is:rare earth magnesium:0.2-0.3 0.01-0.03, copper 0.2-0.3.
9, the manufacture method of cast connecting rod of engine according to claim 1 is characterized in that cast connecting rod heat-treats under protective atmosphere.
10, the manufacture method of cast connecting rod of engine according to claim 1 is characterized in that ball blast and pressure-sizing processing are strengthened in the cast connecting rod surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94116046 CN1123336A (en) | 1994-11-23 | 1994-11-23 | Method for producing cast connecting rod of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94116046 CN1123336A (en) | 1994-11-23 | 1994-11-23 | Method for producing cast connecting rod of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1123336A true CN1123336A (en) | 1996-05-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94116046 Pending CN1123336A (en) | 1994-11-23 | 1994-11-23 | Method for producing cast connecting rod of engine |
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| CN (1) | CN1123336A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103587577A (en) * | 2013-09-04 | 2014-02-19 | 安徽安簧机械股份有限公司 | Manufacturing process of high-strength low-alloy cast steel forklift steering axle |
| CN104480269A (en) * | 2014-11-17 | 2015-04-01 | 芜湖福司精密模具有限公司 | Method for improving mechanical properties of diesel engine connecting rod |
| CN104480273A (en) * | 2014-11-17 | 2015-04-01 | 芜湖福司精密模具有限公司 | Method for improving processing properties of diesel engine connecting rod casting |
| CN104818422A (en) * | 2015-03-31 | 2015-08-05 | 安徽惠明机械制造有限公司 | Casting treatment technology |
| CN108869586A (en) * | 2018-09-06 | 2018-11-23 | 宁夏众信机械设备制造有限公司 | A kind of brake holder and its production technology based on air-pressure disc type brake pincers |
| CN109590693A (en) * | 2019-01-18 | 2019-04-09 | 徐州徐工矿业机械有限公司 | A kind of manufacturing method of excavator cast connecting rod |
-
1994
- 1994-11-23 CN CN 94116046 patent/CN1123336A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103587577A (en) * | 2013-09-04 | 2014-02-19 | 安徽安簧机械股份有限公司 | Manufacturing process of high-strength low-alloy cast steel forklift steering axle |
| CN104480269A (en) * | 2014-11-17 | 2015-04-01 | 芜湖福司精密模具有限公司 | Method for improving mechanical properties of diesel engine connecting rod |
| CN104480273A (en) * | 2014-11-17 | 2015-04-01 | 芜湖福司精密模具有限公司 | Method for improving processing properties of diesel engine connecting rod casting |
| CN104818422A (en) * | 2015-03-31 | 2015-08-05 | 安徽惠明机械制造有限公司 | Casting treatment technology |
| CN108869586A (en) * | 2018-09-06 | 2018-11-23 | 宁夏众信机械设备制造有限公司 | A kind of brake holder and its production technology based on air-pressure disc type brake pincers |
| CN109590693A (en) * | 2019-01-18 | 2019-04-09 | 徐州徐工矿业机械有限公司 | A kind of manufacturing method of excavator cast connecting rod |
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