CN205904387U - Nickelic magnesium iron blast pipe the gating system - Google Patents

Abstract

The utility model discloses a pouring system for a high-nickel ductile iron exhaust pipe, which comprises a sprue, runners arranged on both sides of the lower part of the sprue, and inner runners arranged on both sides of the runner ; The end of the inrunner is connected to a feeding riser, and the feeding riser is connected to the air intake flange surfaces on both sides of the exhaust pipe body by shorting the inrunner. The heat preservation riser is set in the middle of the blue surface, and the heat preservation riser is set on the outlet flange of the exhaust pipe body; when the utility model is used for pouring this type of exhaust pipe, the process yield rate is increased from the original 33% to 42%; at the same time, the use of ceramic slag avoiding nets was canceled, which solved the phenomenon of shrinkage and air leakage at the root of the outlet flange; it also increased the qualified rate of products from 69% to 94%; The tightness and toughness are greatly improved, the service life of the exhaust pipe is improved, and the maintenance cost is saved.

Description

A high-nickel ductile iron exhaust pipe pouring system

technical field

The utility model relates to the technical field of auto parts production, in particular to a pouring system for high-nickel nodular iron exhaust pipes.

Background technique

Existing engine exhaust manifolds, due to the complex product structure, large wall thickness deviation, many isolated heat joints, and many isolated joints on the pipe body; in addition, the material is high-nickel ductile iron, which has a large volume shrinkage and poor fluidity , paste solidification, feeding difficulties, large shrinkage tendency and other reasons, resulting in shrinkage defects and burrs at the connection position between the diaphragm and the flange in the product, causing cracking of the pipe wall; Large, casting defects such as shrinkage, porosity and concave, which lead to pressure test leakage; the characteristics of high-nickel ductile iron material, when producing high-nickel material, large risers or insulation riser sleeves are generally used to feed shrinkage, and the process yield is low, which affects product development.

For example, the Chinese patent application No. 201410432490.2 proposes a light-duty vehicle exhaust pipe pouring process. The specific content is: the position of the gate is moved from the side to the nozzle part in the middle of the exhaust pipe, so that molten iron is injected from the two nozzles. cavity, so that the gas in the cavity is discharged from the two pouring channels under the promotion of the rising molten iron, and at the same time, the gap between the core heads is adjusted in time. The dead core head is good for exhausting and reduces flash and iron thorns, thereby solving the root cause of the air holes in the exhaust pipe and improving the product qualification rate. Although the above utility model improves the product qualification rate, it solves the problem of the pipe body Shrinkage porosity and shrinkage porosity of products; Another example is a casting process for automobile engine exhaust pipes proposed by Chinese patent application No. 201510230123.9. The upper mold and the lower mold of the rapid prototyping paper mold are made, and the rapid prototyping paper-based mold and phenolic resin self-setting sand are used for molding. While the alloy and inoculation process are adjusted, the exhaust pipe is trial poured; the melting raw materials are scrap steel, Alloy and recarburizer are the main raw materials, the amount of nodulizer added is 1.5%, and the amount of 75SiFe inoculant added is 1.2%. The spheroidization has a good effect, and the exhaust pipes can all meet the performance requirements. At a suitable pouring temperature, a complete engine exhaust pipe casting can be casted, and the surface condition is good. The three taps of the exhaust pipe Shrinkage porosity and shrinkage cavities exist in both, and the two laps at the edge have a relatively small shrinkage tendency due to good cooling conditions; although the above patents have realized the advantages of a good surface state of the cast exhaust pipe and a relatively small shrinkage tendency, but However, the problem of low yield and low yield of the casting process is still not solved; and the problem of cracking at the position of the air outlet flange due to high temperature cannot be avoided.

Utility model content

The purpose of this utility model is to provide a high-nickel ductile iron exhaust pipe pouring system, which is used to solve the problems of low yield and low yield of such castings, and at the same time avoid the cracking of the position of the air outlet flange due to high temperature.

In order to achieve the above purpose, the utility model provides the following technical solutions: a high-nickel ductile iron exhaust pipe pouring system, including a sprue, runners arranged on both sides of the lower part of the sprue, runners arranged on the Inner runners on both sides of the runner; the end of the inner runner is connected to a feeding riser, and the feeding riser is connected to the intake flange surfaces on both sides of the exhaust pipe body by shorting the inner runner. The exhaust pipe body is provided with an insulation riser in the middle of the inlet flange surface, and an insulation riser is provided on the outlet flange of the exhaust pipe body.

An exhaust needle is arranged on the threaded boss of the exhaust pipe body.

The feeding riser is an elliptical feeding riser in cross section.

The exhaust pipe is a four-cylinder or six-cylinder exhaust pipe.

A movable pumping block is set at the position of the air outlet on the air outlet flange.

Compared with the prior art, the beneficial effect of the utility model is: the layout of two pieces in one box is adopted, so that two pieces of workpieces can be obtained in one casting; and at the joint position between the inlet flange and the pipe wall, it is easy to There are casting defects such as shrinkage, porosity and concave, which lead to air leakage in the pressure test. In this device, three risers are installed at the place for direct feeding to ensure the pouring quality here; in order to ensure that the pouring The cooling speed of the inlet flange surface is the same, and the insulation riser is set on the flange surface of the second and third exhaust branch pipes; at the same time, in order to avoid shrinkage and shrinkage at the outlet flange, a riser is set on the upper line to carry out Feeding, and in order to avoid burrs that are not easy to clean at the outlet flange and affect the quality of the inner wall of the exhaust pipe, a movable pumping block is set at the outlet hole on the outlet flange.

In addition, the device is provided with an exhaust needle on the threaded boss to solve the problem of shrinkage of the boss on the exhaust pipe and the shrinkage of the product thermal section; when casting this type of exhaust pipe of the utility model, the process product The rate increased from 33% to 42%; at the same time, the use of ceramic slag avoiding nets was canceled, which solved the phenomenon of shrinkage and air leakage at the root of the outlet flange; and the qualified rate of products increased from 69% to 94%. At the same time, the airtightness and toughness of the exhaust pipe can be greatly improved, the service life of the exhaust pipe is improved, and the maintenance cost is saved.

Description of drawings

Fig. 1 is the structural representation of the pouring finished product of the utility model;

Fig. 2 is the three-dimensional structure schematic diagram of the pouring finished product of the utility model;

Fig. 3 is an enlarged partial structural schematic diagram of the air outlet flange of the utility model.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Please refer to Figure 1-2, the utility model provides a technical solution: a high-nickel ductile iron exhaust pipe pouring system, including a sprue 6 and runners 5 arranged on both sides of the lower part of the sprue 6 1. The inrunner 4 arranged on both sides of the runner 5; the end of the inrunner 4 is connected to the feeding riser 7, and the feeding riser 7 is connected to the exhaust pipe body by shorting the inrunner 14 The two sides of 9 are connected to each other with 3 faces of the side inlet flanges, and the exhaust pipe body 9 is provided with a thermal insulation riser 7 in the middle of the 3 faces of the intake flange, and the thermal insulation riser 2 is arranged on the outlet flange of the exhaust pipe body 9. ; The threaded boss 8 of the exhaust pipe body 9 is provided with an exhaust needle 11; the feeding riser 7 is an oval feeding riser in cross section; the exhaust pipe body 9 is a four-cylinder row trachea.

In this embodiment, the minimum cross-section is set at the position where the runner is close to the sprue, so that the high-nickel nodular iron liquid can fill the cavity smoothly, continuously and uniformly during pouring; eliminate turbulent flow, avoid oxidation caused by gas involvement, At the same time, it also reduces the erosion of the core and mold; and the reasonable layout of the riser of the device combined with the exhaust needle makes the casting defects of shrinkage and porosity in the hard-to-feed parts disappear.

In addition, this embodiment adopts the form of sub-joint inner sprue, which can reduce the contact area between the thermal insulation riser and the intake flange surface, making it easier to clean the workpiece; and the adopted riser is the thermal insulation riser, which can be Feed the air outlet flange to reduce the probability of shrinkage and shrinkage of the air outlet flange.

Referring to FIG. 3 , the second embodiment differs from the first embodiment in that: the air outlet flange 1 is provided with a movable pumping block 12 at the position of the air outlet hole 13 .

In this embodiment, a movable pumping block is set at the air outlet, which can form a protection for the air outlet here, and avoid large-area contact between the riser and the air outlet flange; thereby eliminating burrs and solving the cracking problem of the bench test.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (5)

1. a kind of high-Ni-Cr cast iron exhaustor running gate system it is characterised in that: include sprue, be arranged on described sprue bottom two The cross gate of side, it is arranged on the ingate of described cross gate both sides；Described ingate end connects feeding head, and described feeding emits Mouth is connected with the inlet flange face of aerofluxuss tube body both sides side by short circuit ingate, and described aerofluxuss tube body is in inlet flange Middle face arranges insulated feeder, and the flange of giving vent to anger of described aerofluxuss tube body arranges insulated feeder.

2. high-Ni-Cr cast iron exhaustor running gate system according to claim 1 it is characterised in that: the spiral shell of described aerofluxuss tube body Exhaust needle is arranged on stricture of vagina boss.

3. high-Ni-Cr cast iron exhaustor running gate system according to claim 2 it is characterised in that: described feeding head be transversal Face is oval feeding head.

4. high-Ni-Cr cast iron exhaustor running gate system according to claim 3 it is characterised in that: described exhaustor be four cylinders or Six cylinder exhaustors.

5. high-Ni-Cr cast iron exhaustor running gate system according to claim 4 it is characterised in that: going out on described flange of giving vent to anger Block is taken out in the setting activity of pore position.