CN108941469A - A kind of technique of heat resisting steel volute running channel pushing off the slag and feeding - Google Patents

Abstract

The invention discloses belong to heat resisting steel volute casting technology field, the technique of especially a kind of heat resisting steel volute running channel pushing off the slag and feeding, including sprue, the sprue upper section place filter, " eight " type contraction flow region is set in the middle part of the sprue, and feeding head neck is arranged in the sprue lower section.The Pouring System Design Method can quickly fill type with big flow, avoid not forming, oxide inclusion defects, meanwhile, riser quantity is saved, product yield is improved.

Description

A kind of technique of heat resisting steel volute running channel pushing off the slag and feeding

Technical field

The present invention relates to heat resisting steel volute casting technology field, especially a kind of heat resisting steel volute running channel pushing off the slag and feeding Technique.

Background technique

With the continuous improvement of environmental requirement, automobile engine tail gas exhaust temperature is higher and higher, resistance to 950 DEG C of nickel Ovshinsky Exhaust manifold, the volute of body magnesium iron material have been unable to meet requirement.Currently, the exhaust discrimination of austenitic matrix heat resisting steel material Pipe, volute are gradually applied in engine exhaust system, and 1050 DEG C of heatproof, thermal fatigue, good in oxidation resistance.

Austenitic matrix heat resisting steel alloy content is high, and degree of supercooling is big, poor fluidity, fills type difficulty.Heat resisting steel volute is general Wall thickness 4.5mm, the volute of dual channel type, wall thickness only 3mm between two runners will fully consider that casting forms in Design of Runner System Property, the process of type is quickly filled using big flow.

Four unit running gate systems are used in general G. Iron Castings technological design, as depicted in figs. 1 and 2, wherein 1- sprue (F_Directly), 2- overlaps (F_Resistance), wherein overlap joint is also referred to as the vertical choked flow of cross gate, cross gate overlaps up and down, and iron liquid flows through herein, flowing side To change, is conducive to dregs floating, plays the role of pushing off the slag, 3- cross gate (F_{It is horizontal}), 4- ingate (F_{It is interior}), F_Directly: F_Resistance: F_{It is horizontal}: F_{It is interior}=1: 0.8:1.2:0.9；But heat resisting steel volute wall is thin, and molten steel is oxidizable, difficult forming, and traditional four unit running gate systems are not suitable for heat-resisting The casting of steel volute.

Summary of the invention

In view of this, in view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of heat resisting steel volute running channel pushing off the slag And the technique of feeding, this Pouring System Design Method can quickly fill type with big flow, it avoids not forming, oxide inclusion defects, Meanwhile riser quantity is saved, improve product yield.

In order to achieve the above objectives, the invention adopts the following technical scheme:

A kind of heat resisting steel volute running channel, including sprue, the sprue upper section place filter, the sprue middle part " eight " type contraction flow region is set, and feeding head neck is arranged in the sprue lower section.

Further, the technique of the heat resisting steel volute running channel pushing off the slag and feeding, comprising the following steps:

(1) sprue, filter and " eight " type contraction flow region section ratio, i.e. F are determined_Directly: F_Filter: F_Resistance=1:4:0.8；

(2) running gate system filling time is determined:

Wherein: G is molten steel total weight in type, including running and feeding system weight；

(3) formula is praised according to Austria and determines each running gate system sectional area:

Wherein: ρ is molten steel density, and μ is flow loss coefficient, and g is acceleration of gravity, and Hp is average static pressure grease head highness；

F_Directly=1.25*F_Resistance,

F_Filter=5*F_Resistance。

The beneficial effects of the present invention are:

1, the present invention is cast using resin-coated sand shell mould, and sprue upper section places filter, is used for pushing off the slag；It is set in the middle part of sprue " eight " type contraction flow region is set, feeding head neck is arranged in sprue lower section, and pressurization flange the tip of the tongue region is volute functional areas, by High Temperature Gas Stream constantly impact, quality requirement is high, is not allow for Micro shrinkage defect；Feeding head neck designs in this region, can play benefit Contracting effect, eliminates Micro shrinkage defect；This Pouring System Design Method can quickly fill type with big flow, avoid not forming, oxygen Change dreg defect, meanwhile, it shares the feeding of sprue molten steel and is pressurized flange, riser quantity can be saved, reduce cost, improve technique and go out Product rate.

2, present invention determine that 3 section ratio of sprue 1, filter 2 and " eight " type contraction flow region, i.e. F_Directly: F_Filter: F_Resistance=1:4: 0.8, this section is than considering filter porosity and by the influence factor of efficiency, and molten steel flows through filter, and flow loss is small, Pushing off the slag effect is good.

Detailed description of the invention

Fig. 1 is the top view and sectional view of the running gate system of Unit four in the prior art；

Fig. 2 is the A-A sectional view in Fig. 1；

Fig. 3 is the running gate system top view of the embodiment of the present invention 1；

Fig. 4 is the running gate system main view of the embodiment of the present invention 1.

In Fig. 1 and Fig. 2: 1- sprue, 2- overlap joint, 3- cross gate, 4- ingate；

In Fig. 3 and Fig. 4: 1- sprue, 2- filter, 3- " eight " type contraction flow region, 4- feeding head neck.

Specific embodiment

The invention will be further described with reference to the accompanying drawings and examples.

Embodiment 1

As shown in Figure 3 and Figure 4, a kind of heat resisting steel volute running channel, including sprue 1, wherein 1 upper section of sprue places filtering Device 2, " eight " type contraction flow region 3 is arranged in the middle part of sprue 1, and feeding head neck 4 is arranged in 1 lower section of sprue.

The technique of heat resisting steel volute running channel pushing off the slag and feeding, comprising the following steps:

(1) 3 section ratio of sprue 1, filter 2 and " eight " type contraction flow region, i.e. F are determined_Directly: F_Filter: F_Resistance=1:4:0.8；

(2) running gate system filling time is determined:

Wherein: G is molten steel total weight in type, including running and feeding system weight；

(3) formula is praised according to Austria and determines each running gate system sectional area:

Wherein: ρ is molten steel density, and μ is flow loss coefficient, and g is acceleration of gravity, and Hp is average static pressure grease head highness；

F_Directly=1.25*F_Resistance,

F_Filter=5*F_Resistance。

G is 35kg, t 5.8s, Hp 31cm, ρ 0.0076Kg/cm in the present embodiment³, g 981cm/S², μ is 0.35, it is computed, F in the present embodiment_DirectlyFor 12cm², F_FilterFor 48cm², F_ResistanceFor 9.6cm²。

Embodiment 2

G is 40kg, t 6.1s, Hp 31cm, ρ 0.0076Kg/cm in embodiment 2³, g 981cm/S², μ 0.35, It is computed, F in the present embodiment_DirectlyFor 13.1cm², F_FilterFor 52.5cm², F_ResistanceFor 10.5cm²。

Embodiment 3

G is 45kg, t 6.3s, Hp 31cm, ρ 0.0076Kg/cm in embodiment 3³, g 981cm/S², μ 0.35, It is computed, F in the present embodiment_DirectlyFor 14.3cm², F_FilterFor 57cm², F_ResistanceFor 11.4cm²。

Embodiment 4

G is 50kg, t 6.5s, Hp 31cm, ρ 0.0076Kg/cm in embodiment 4³, g 981cm/S², μ 0.35, It is computed, F in the present embodiment_DirectlyFor 15.4cm², F_FilterFor 61.5cm², F_ResistanceFor 12.3cm²。

Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, this field is common Other modifications or equivalent replacement that technical staff makes technical solution of the present invention, without departing from technical solution of the present invention Spirit and scope, be intended to be within the scope of the claims of the invention.

Claims (2)

1. a kind of heat resisting steel volute running channel, it is characterised in that: including sprue (1), sprue (1) upper section places filter (2), " eight " type contraction flow region (3) are set in the middle part of the sprue (1), feeding head neck (4) are arranged in sprue (1) lower section.

2. utilizing the technique of heat resisting steel volute running channel pushing off the slag and feeding described in claim 1, it is characterised in that: including following step It is rapid:

(1) sprue (1), filter (2) and " eight " type contraction flow region (3) section ratio, i.e. F are determined_Directly: F_Filter: F_Resistance=1:4: 0.8；

(2) running gate system filling time is determined:

Wherein: G is molten steel total weight in type, including running and feeding system weight；

(3) formula is praised according to Austria and determines each running gate system sectional area:

Wherein: ρ is molten steel density, and μ is flow loss coefficient, and g is acceleration of gravity, and Hp is average static pressure grease head highness；

F_Directly=1.25*F_Resistance,

F_Filter=5*F_Resistance。