CN214867067U

CN214867067U - Casting system for preventing cracks of cast steel exhaust pipe

Info

Publication number: CN214867067U
Application number: CN202121146082.2U
Authority: CN
Inventors: 谢会豪; 刘松奇; 齐晓波; 张召; 陈大帅
Original assignee: Nanyang Feilong Automobile Parts Co ltd
Current assignee: Nanyang Feilong Automobile Parts Co ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-11-26
Anticipated expiration: 2031-05-26

Abstract

The utility model relates to a gating system technical field, concretely relates to prevent casting steel blast pipe crackle's gating system, including casting structure and gating system, the gating system includes sprue bar, first cross gate, second cross gate, first rising head, second rising head, third rising head, fourth rising head and cylindrical pouring cup, the casting structure includes the casting mould and is fixed in the chill on the casting mould, and sprue and first cross gate are connected perpendicularly, and first cross gate rightmost side is provided with cylindrical pouring cup, and first cross gate and second cross gate parallel arrangement just connect through first rising head and second rising head, and the second cross gate is connected through the flange joint of first rising head, second rising head and third rising head connector on the casting mould. According to the casting system, the cooling sequence of each part in the casting process is adjusted, the stress at the wall thickness is reduced, the casting finished product efficiency can be effectively improved, and the cracks of the pipe wall are reduced.

Description

Casting system for preventing cracks of cast steel exhaust pipe

Technical Field

The utility model relates to a gating system technical field, concretely relates to prevent casting system of cast steel blast pipe crackle.

Background

The exhaust pipe is a necessary device for determining the performance of the automobile, and the main function of the exhaust pipe is to help the automobile to exhaust high-temperature gas with certain pressure, so the judgment of the quality of the finished product is particularly important in the process of casting the exhaust pipe. However, the inspection finds that the finished product rate of the exhaust pipe blank is low in the stage of sample pieces, the defect factors are concentrated, the most important defect is pipe wall crack which accounts for almost 100%, the blank is scrapped in a large amount, and the new product joint is delayed. The main reason for the occurrence of the cracks on the pipe wall is that the pipe wall is thick, so that the cracks are generated due to slow cooling, or the cracks are generated due to overlarge stress caused by overlarge heat of molten steel flowing through the pipe wall.

In the existing pouring system which is used more, cracks at the position of a bent pipe wall and cracks at the position of an original mark are main reasons for scrapping in the production process of an exhaust pipe blank, particularly, the position of the bent pipe wall is thick, and because a casting at the position is too high in flowing speed and too much in flowing amount of molten steel in the casting process, the stress at the position is too large, so that the cracks appear.

Disclosure of Invention

The utility model aims at providing a reduce blast pipe wall crackle, improve blast pipe finished product casting efficiency's casting system.

The utility model discloses a reach the technical scheme that above-mentioned purpose adopted and be: a casting system for preventing cracks of a cast steel exhaust pipe comprises a casting structure and a casting system. The casting structure comprises a casting mold and a chill fixed on the casting mold.

The straight pouring bar is vertically communicated with the first cross gate, and the cylindrical pouring cup is positioned at the rightmost side of the first cross gate.

The riser comprises a first riser, a second riser, a third riser and a fourth riser.

Preferably, the risers are all exothermic risers.

The second cross pouring channel and the first cross pouring channel are placed in parallel, and the second cross pouring channel and the first cross pouring channel are connected to the first riser and the second riser.

The first riser, the second riser and the third riser are located on the second cross runner, the fourth riser is located on the pouring system and is placed at the same height as the first riser, the second riser and the third riser, and the risers are connected with the casting mold through flanges.

And the chilling block is limited to the position on the casting mould corresponding to the mark.

Four corners of the casting mould corresponding to the chilling blocks are respectively provided with a cylindrical cavity, strong magnets are placed in the cylindrical cavities, and the chilling blocks are limited on the casting mould through the strong magnets.

The utility model has the advantages that the molten steel is sent into the pouring system through the straight pouring rod and flows into the first cross runner, and the right side of the first cross runner is provided with the pouring cup for buffering the flowing molten steel and stopping slag; the first runner and the second runner are arranged in parallel, and molten steel flows into the second runner from the interface of the first runner and the second runner; the molten steel passes through the connecting flanges at the first riser, the second riser and the third riser of the second cross runner to transmit the molten steel to the casting mold; the first riser, the second riser, the third riser and the fourth riser are used for feeding in the molten steel cooling process, and the problems of shrinkage cavity, shrinkage porosity and the like are solved.

The casting structure comprises a casting mold and a chilling block located on the casting mold and corresponding to the mark, wherein the chilling block is used for accelerating the cooling speed of the mark in the casting process and preventing cracks from occurring at the mark.

The utility model discloses an at the structural chill that suitably adds of casting for the cooling rate of relevant position department prevents that the crackle from appearing, through the structure that improves the gating system, reduces crooked pipe wall department molten steel flow volume and molten steel through-time, reduces this department heat, reduces stress, thereby prevents the appearance of crackle, and this gating system after the improvement can effectively improve foundry goods finished product efficiency, reduces the pipe wall crackle.

Drawings

Fig. 1 is a schematic view of the entire structure of a conventional casting system.

Fig. 2 is a schematic view of the overall structure of the casting system for preventing cracks in the cast steel exhaust pipe according to the present invention.

Detailed Description

The technical features, objects and advantages of the present invention will be further described with reference to the accompanying drawings and embodiments.

Comparative example

As shown in fig. 1, the conventional casting system includes a casting structure and a casting system, the casting structure includes an exhaust pipe casting mold, the casting system includes a sprue bar 10, a runner 11, a first exothermic riser 131, a second exothermic riser 132, a third exothermic riser 133, a fourth exothermic riser 134 and a cylindrical sprue cup 12, the sprue bar 10 is vertically communicated with the runner 11, the cylindrical sprue cup 12 is disposed at the rightmost side of the runner 11, the four exothermic risers are horizontally disposed and respectively connected to the casting mold through flanges 14, and the runner 11 is connected to the casting mold through the first exothermic riser 131 and the second exothermic riser 132. During pouring, molten steel enters the runner 11 from the sprue bar 10 and then enters the casting mold from the first exothermic riser 131 and the second exothermic riser 132 and the connecting flange 14 of the casting mold. The existing casting system has the feeding effect by adding risers, but the casting mould only enters the casting mould through the first riser and the second riser, the pipe wall of the elbow is thick, the heat is too high, the stress is increased, and the pipe wall cracks are generated.

Examples

As shown in fig. 2, the utility model relates to a casting system for preventing cast steel blast pipe crackle, this system includes cast structure and gating system, and the gating system includes straight pouring rod 1, first runner 2, second runner 6, first exothermic riser 41, second exothermic riser 42, third exothermic riser 43, fourth exothermic riser 44 and cylindrical pouring basin 3, and the cast structure includes the casting mould and is located the chill that corresponds position department with the sign on the casting mould.

In the pouring system, molten steel flows into a first runner 2 vertically communicating with a sprue bar 1 through the sprue bar 1, and is buffered and retained by a cylindrical tundish 3 at the rightmost side of the first runner 2. The first cross gate 2 and the second cross gate 6 are arranged in parallel and connected to the first exothermic riser 41 and the second exothermic riser 42, the molten steel flows into the second cross gate 6 through an interface, the first exothermic riser 41, the second exothermic riser 42 and the third exothermic riser 43 are all horizontally arranged on the second cross gate 6 and connected with the casting mold through a flange 5, and the molten steel flows through the flange 5 and flows into the casting mold through the first exothermic riser 41, the second exothermic riser 42 and the third exothermic riser 43. The pouring system is also provided with a fourth heating riser 44 which is horizontally arranged with other three heating risers, and the four heating risers are used for feeding in the casting cooling process to prevent the phenomena of shrinkage cavity, shrinkage porosity and the like. With the contrast of casting system structure before the improvement of fig. 1, the utility model discloses set up second cross gate 6, can help to divide the molten steel flow volume of going crooked pipeline department and reduce the molten steel through-time to this reduces crooked pipe wall department heat, reduces stress, and it is slow to prevent that the too big cooling rate of stress from appearing the crackle.

Four corners of the position, corresponding to the chiller, of the casting mold are respectively provided with a cylindrical cavity, a strong magnet is placed in the cylindrical cavity, and the chiller is limited on the casting mold through the strong magnet. Therefore, the cooling speed of each part of the casting can be synchronized by chilling the mark and reducing the cooling speed of the mark, and cracks are prevented from being generated.

It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived from the description of the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.

Claims

1. The casting system for preventing the cracks of the cast steel exhaust pipe comprises a casting structure and a casting system, and is characterized in that the casting system comprises a straight casting bar, a first cross gate, a second cross gate, a riser and a cylindrical pouring cup, and the casting structure comprises a casting mold and a chill fixed on the casting mold.

2. The cast-steel exhaust pipe crack prevention gating system as defined in claim 1, wherein the sprue bar is vertically communicated with the first runner, and the cylindrical tundish is located at the rightmost side of the first runner.

3. The cast-steel exhaust pipe crack prevention gating system as defined in claim 2, wherein the risers include a first riser, a second riser, a third riser and a fourth riser, and the risers are exothermic risers.

4. The cast-steel exhaust pipe crack prevention gating system as claimed in claim 3, wherein the second runner is disposed in parallel with the first runner and connected to the first riser and the second riser.

5. The cast-steel exhaust pipe crack prevention gating system as defined in claim 4, wherein the first riser, the second riser and the third riser are located on the second runner, and the fourth riser is located on the gating system at the same height as the first riser, the second riser and the third riser, and the risers are connected to the mold by flanges.

6. The cast-steel exhaust pipe crack prevention gating system as defined in claim 1, wherein the chill is positioned at a location on the mold corresponding to the mark.

7. The casting system for preventing cracks in a cast steel exhaust pipe as recited in claim 6, wherein four corners of the casting mold corresponding to the chiller are respectively provided with a cylindrical cavity, a strong magnet is placed in the cylindrical cavity, and the chiller is limited on the casting mold through the strong magnet.