CN102269020B - Method for producing integral volute pressurization exhaust manifold - Google Patents

Abstract

The invention discloses a method for producing an integral volute pressurization exhaust manifold. The integral volute pressurization exhaust manifold comprises a supercharger turbo shell and an exhaust manifold. The supercharger turbo shell and the exhaust manifold are integrally cast. The integral volute pressurization exhaust manifold is made of an austenitic nodular cast iron QTANi35Si5Cr2 material. According to a product produced by the invention, the supercharger turbo shell and the exhaust manifold are designed into an integral cast; weights of parts are greatly reduced; simultaneously, a flow channel is smooth; and the normal exertion of engine power cannot be influenced by preventing a vortex from locally generated in a gap of combined surfaces in the gas flowing process.

Description

A kind of method for producing integral volute pressurization exhaust manifold

Technical field

The invention belongs to technical field of automobile parts, be specifically related to a kind of method for producing integral volute pressurization exhaust manifold.

Background technique

Updating and optimizing along with exhaust turbine pressuring technology, the continuous reduction of cost, in addition the catalysis of awareness of saving energy and Abgasgesetz, automobile emission rule is harsher, reduces car body weight, reduces fuel consumption, improves the matter of utmost importance that motor car engine compression ratio is Automobile Design.Motor car engine supercharging technology more and more comes into one's own, because it can not increase on the basis of engine displacement, increases substantially power and moment of torsion.By the contrast to various supercharging mode, exhaust turbine pressuring technology, owing to not consuming useful work, is widely used.Motor is after employing exhaust turbine pressuring technology, the maximum explosive pressure produced in work and mean temperature will increase substantially, in design most at present, supercharger turbo shell, gas exhaust manifold are two foundry goods independently, volume is large, weight is also large, and this does not meet the requirement of automotive light weight technology.In addition turbine case and gas exhaust manifold junction plane by after processing with being threaded, runner is rough, and the gap of junction plane makes gas local in flow process produce eddy current, affect the normal performance of engine power, noise increasing simultaneously.

Summary of the invention

The object of the invention is to avoid above-mentioned deficiency of the prior art, and a kind of method for producing integral volute pressurization exhaust manifold is provided.

Realizing the technological scheme that object of the present invention adopts is: a kind of production method of integral volute pressurization exhaust manifold, described integral volute pressurization exhaust manifold comprises supercharger turbo shell and gas exhaust manifold, described supercharger turbo shell and gas exhaust manifold cast inblock processing, described integral volute pressurization exhaust manifold is made up of high-nickel austenite nodular cast iron QTANi35Si5Cr2 material; Described high-nickel austenite nodular cast iron QTANi35Si5Cr2, comprises the chemical composition (unit, wt%) of following mass percent: C :≤2.0%; Si:4 ~ 6%; Mn:0.5 ~ 1.5%; Ni:34.0 ~ 36%; Cr:1.5 ~ 2.5%; Cu≤0. 5%; P≤0.05%; S≤0.03%, is characterized in that: the production method of described integral volute pressurization exhaust manifold comprises the steps:

A, reinforcement raw and auxiliary material warehouse-in control; To Q10, Q12 high duty pig iron that Linzhou City of buying produces, the nodulant, silicon strontium inovulant, 75SiFe inovulant etc. of the low-carbon waste steel of high-quality, nickel magnesium nodulizer, Si-Mg alloy carry out incoming test, rationally deposit granting, ensure its quality;

B, strengthening process process control: the selection of Chemical composition, to a certain degree have impact on Oxygen potential and mechanical property, and Chemical composition table is as follows:

	C	Si	Mn	S	P	Cr	Ni	Mo	Mg	Cu	Fe	Ce
													Base iron	2.01	4.32	0.538	0.007	0.02	1.86	35.6	0.61	0	0.012	55.1	0.00316
After process	1.95	5.15	0.531	0.007	0.02	1.81	34.9	0.61	0.13	0.012	54.8	0.0034

Strict tapping temperature, process stipulation is come out of the stove at 1630 DEG C ± 10 DEG C;

The addition 1.0% of strict control nodulant, residual magnesium amount is between 0. 8%-0.14%;

Adopt the means of Multi inoculation, divide and breed for three times, that is: wrap end nodulant at the 75SiFe adding a cover 0.2%, secondary is at the silicon strontium of launder current-following inoculation 0.4%, and the long-acting inovulant of instant inoculation 0.18%;

C, accelerate pouring time: general often bag process 500kg molten iron, controlled pouring time between 7-10 minutes;

Foundry goods after d, cast, takes off work after being incubated 1-2 hours;

E, employing InteCast CAE solidification simulation software are analyzed its process of setting, designing pouring technology simultaneously, for the isolated thermal center that some are special, adopting and laying Quench core, exothermic riser, on fuse, offering the techniques such as cast gate;

F, Design of Dies and making: mould three dimensional design adopts Pro/E software, Making mold adopts highi degree of accuracy machining center, and utilizes CIMATRON software programming;

G, coremaking and moulding: adopt cold core box process coremaking, with special core assembly mold, by single core composition core unit;

H, combination core: adopt box-less shoot squeeze mo(u)lding line, there is higher sand hardness, highly stable characteristic;

I, machining is carried out to parts.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the invention will be further described:

Fig. 1 is the structural representation of integral volute pressurization exhaust manifold in the present invention.

Fig. 2 is the casting flow chart of integral volute pressurization exhaust manifold in the present invention.

Fig. 3 is the machining flow chart of integral volute pressurization exhaust manifold in the present invention.

Embodiment

As Fig. 1, Fig. 2 institute, shown in Fig. 3: below by specific embodiment, further illustrate advantage of the present invention:

A kind of integral volute pressurization exhaust manifold, comprises supercharger turbo shell 1 and gas exhaust manifold 2, described supercharger turbo shell 1 and gas exhaust manifold 2 cast inblock processing.

Described high-nickel austenite nodular cast iron QTANi35Si5Cr2, it comprises the chemical composition (unit, wt%) of following mass percent: C :≤2.0%; Si:4 ~ 6%; Mn:0.5 ~ 1.5%; Ni:34.0 ~ 36%; Cr:1.5 ~ 2.5%; Cu≤0. 5%; P≤0.05%; S≤0.03%.

The production method of described high-nickel austenite nodular cast iron QTANi35Si5Cr2 comprises the steps:

A, reinforcement raw and auxiliary material warehouse-in control; To the high duty pig iron (production of Q10, Q12 Linzhou City) of buying, the nodulant, silicon strontium inovulant, 75SiFe inovulant etc. of the low-carbon waste steel of high-quality, nickel magnesium nodulizer, Si-Mg alloy carry out incoming test, rationally deposit granting, ensure its quality;

B, strengthening process process control: the selection of Chemical composition, to a certain degree have impact on Oxygen potential and mechanical property, and Chemical composition table is as follows:

	C	Si	Mn	S	P	Cr	Ni	Mo	Mg	Cu	Fe	Ce
													Base iron	2.01	4.32	0.538	0.007	0.02	1.86	35.6	0.61	0	0.012	55.1	0.00316
After process	1.95	5.15	0.531	0.007	0.02	1.81	34.9	0.61	0.13	0.012	54.8	0.0034

Strict tapping temperature, because product is thin-wall part, complex structure, the liquid contraction of high-Ni-Cr cast iron is comparatively large, and therefore, process stipulation is come out of the stove at 1630 DEG C ± 10 DEG C,

The addition 1.0% of strict control nodulant, because Mg is the element that a kind of carbide is formed, the too much existence of residual magnesium amount has a significant impact affecting matrix, and therefore residual magnesium amount is between 0.08%-0.14%,

Adopt the means of Multi inoculation (divide and breed for three times), that is: wrap the 75SiFe that end nodulant adds a cover 0.2%, secondary is at the silicon strontium of launder current-following inoculation 0.4%, and the long-acting inovulant of instant inoculation 0.18%;

C, accelerate pouring time: general often bag process 500kg molten iron, pouring time controlled between 7-10 minutes, in case the too fast and decaying spheroidisation of molten iron cooling;

Foundry goods after d, cast, takes off work after being incubated 1-2 hours, in case rate of cooling is too fast cause casting deformation;

The production method of integral volute pressurization exhaust manifold, it comprises the following steps:

The production of a, high-nickel austenite nodular cast iron QTANi35Si5Cr2 as above.

B, employing InteCast CAE solidification simulation software are analyzed its process of setting, designing pouring technology simultaneously, for the isolated thermal center that some are special, adopting and laying Quench core, exothermic riser, on fuse, offering the techniques such as cast gate.

C, Design of Dies and making: mould three dimensional design adopts Pro/E software, Making mold adopts highi degree of accuracy machining center, and utilizes CIMATRON software programming.

D, coremaking and moulding: adopt cold core box process coremaking, with special core assembly mold, by single core composition core unit.

E, combination core: adopt box-less shoot squeeze mo(u)lding line, higher sand hardness, highly stable characteristic can ensure the production of the foundry goods of high repetition and high dimensional accuracy.

F, machining is carried out to parts.

Claims (1)

1. the production method of an integral volute pressurization exhaust manifold, described integral volute pressurization exhaust manifold comprises supercharger turbo shell and gas exhaust manifold, described supercharger turbo shell and gas exhaust manifold cast inblock processing, described integral volute pressurization exhaust manifold is made up of high-nickel austenite nodular cast iron QTANi35Si5Cr2 material; Described high-nickel austenite nodular cast iron QTANi35Si5Cr2, comprises the chemical composition (unit, wt%) of following mass percent: C :≤2.0%; Si:4 ~ 6%; Mn:0.5 ~ 1.5%; Ni:34.0 ~ 36%; Cr:1.5 ~ 2.5%; Cu≤0. 5%; P≤0.05%; S≤0.03%, is characterized in that: the production method of described integral volute pressurization exhaust manifold comprises the steps:

A, reinforcement raw and auxiliary material warehouse-in control; To Q10, Q12 high duty pig iron that Linzhou City of buying produces, the nodulant, silicon strontium inovulant, 75SiFe inovulant etc. of the low-carbon waste steel of high-quality, nickel magnesium nodulizer, Si-Mg alloy carry out incoming test, rationally deposit granting, ensure its quality;

B, strengthening process process control: the selection of Chemical composition, to a certain degree have impact on Oxygen potential and mechanical property, and Chemical composition table is as follows:

C Si Mn S P Cr Ni Mo Mg Cu Fe Ce Base iron 2.01 4.32 0.538 0.007 0.02 1.86 35.6 0.61 0 0.012 55.1 0.00316 After process 1.95 5.15 0.531 0.007 0.02 1.81 34.9 0.61 0.13 0.012 54.8 0.0034

Strict tapping temperature, process stipulation is come out of the stove at 1630 DEG C ± 10 DEG C;

The addition 1.0% of strict control nodulant, residual magnesium amount is between 0. 8%-0.14%;

Adopt the means of Multi inoculation, divide and breed for three times, that is: wrap end nodulant at the 75SiFe adding a cover 0.2%, secondary is at the silicon strontium of launder current-following inoculation 0.4%, and the long-acting inovulant of instant inoculation 0.18%;

C, accelerate pouring time: general often bag process 500kg molten iron, controlled pouring time between 7-10 minutes;

Foundry goods after d, cast, takes off work after being incubated 1-2 hours;

E, employing InteCast CAE solidification simulation software are analyzed its process of setting, designing pouring technology simultaneously, for the isolated thermal center that some are special, adopting and laying Quench core, exothermic riser, on fuse, offering the techniques such as cast gate;

F, Design of Dies and making: mould three dimensional design adopts Pro/E software, Making mold adopts highi degree of accuracy machining center, and utilizes CIMATRON software programming;

G, coremaking and moulding: adopt cold core box process coremaking, with special core assembly mold, by single core composition core unit;

H, combination core: adopt box-less shoot squeeze mo(u)lding line, there is higher sand hardness, highly stable characteristic;

I, machining is carried out to parts.。