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Thick-wall cast steel exhaust manifold casting process

An exhaust manifold and casting process technology, which is applied in the field of thick-wall cast steel exhaust manifold casting technology, can solve the problems of inability to meet the high temperature resistance of the thick-wall cast steel exhaust manifold and unsuitable for automobile exhaust manifolds. , to achieve the effect of reducing the risk of cold insulation, good mechanical properties, and high product qualification rate

Active Publication Date: 2018-10-16
NANYANG FEILONG AUTOMOBILE PARTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the heat-resistant cast steel turbocharger turbine housing iron mold sand-covered casting process provided by this invention is used for processing the heat-resistant cast steel turbocharger turbine housing, which is not suitable for the casting of automobile exhaust manifolds, and The coated sand used in this invention cannot meet the high temperature performance requirements of the thick-walled cast steel exhaust manifold

Method used

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  • Thick-wall cast steel exhaust manifold casting process
  • Thick-wall cast steel exhaust manifold casting process
  • Thick-wall cast steel exhaust manifold casting process

Examples

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Effect test

Embodiment 1

[0041] This embodiment provides a thick-wall cast steel exhaust manifold casting mold including sand mold, riser, sand core and pouring system; refer to figure 2 , the sand core is provided with two sand-shooting openings, that is, number 5 and number 6 in the figure; refer to figure 1, the pouring system includes a straight pouring rod 1 and a runner, the straight pouring rod 1 is vertically connected to the runner, a filter 2 is set in the middle of the runner, and a filter 2 is set at the end of the runner into the riser. The sand core is matched with the sand mold, the sprue connected with the runner is set in the sprue 1, the riser includes four large surface risers 3-4, two triangular flanges Riser 3-1, a fire inlet riser 3-3 and a thermal insulation riser 3-2. Fire inlet riser 3-3 and insulation riser 3-2 are all provided with riser neck, and riser neck is provided with easily broken groove. The fire inlet riser 3-3 and the inner runner are of an integrated structur...

Embodiment 2

[0044] A method for casting a thick-walled cast steel exhaust manifold provided in this embodiment, using the casting model in Embodiment 1, includes the following steps:

[0045] S1: Core making:

[0046] Hot core making: Use coated sand doped with 30% chromite sand as the raw material of the cavity core, heat the core box to 200°C, shoot sand into the core box for 4-6 seconds through two sand injection ports, and the shell will form. Curing, vibrating to pour out the uncured coated sand in the inner cavity of the sand core. After 180 seconds, the sand core is cured and taken out of the core box to ensure that the thickness of the sand shell is 6-8mm;

[0047] Cold core: heat and mix the dried sand, liquid phenolic resin, and liquid polyisocyanate resin according to the weight ratio of dry sand: liquid phenolic resin: liquid polyisocyanate resin at a ratio of 98:1:1, and the temperature is 20°C, and then join the cold core machine to form under the catalysis of triethylamine...

Embodiment 3

[0054] A method for casting a thick-walled cast steel exhaust manifold provided in this embodiment, using the casting model in Embodiment 1, includes the following steps:

[0055] S1: Core making:

[0056] Hot core making: Use coated sand doped with 30% chromite sand as the raw material of the cavity core, heat the core box to 230°C, shoot sand into the core box for 4-6 seconds through two sand injection ports, and the shell will form. Curing, vibrating to pour out the uncured coated sand in the inner cavity of the sand core. After 180 seconds, the sand core is cured and taken out of the core box to ensure that the thickness of the sand shell is 6-8mm;

[0057] Cold core: heat and mix the dried sand, liquid phenolic resin, and liquid polyisocyanate resin according to the weight ratio of dry sand: liquid phenolic resin: liquid polyisocyanate resin at a ratio of 123:1:1, and the temperature is 40°C, and then join the cold core machine to form under the catalysis of triethylamin...

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Abstract

The invention discloses a thick-wall cast steel exhaust manifold casting process and belongs to the technical field of exhaust manifold casting. According to the thick-wall cast steel exhaust manifoldcasting process, a thick-wall cast steel exhaust manifold casting mold and method are included. The casting mold comprises a sand mold, feeder heads, a sand core and a pouring system. The sand core is provided with multiple sand jetting openings. The pouring system comprises a sprue bar, a cross gate and an ingate. The sprue bar communicates with the cross gate in a perpendicular manner. A filteris arranged in the middle of the cross gate. The feeder heads comprise the large-face feeder heads, the triangular flange feeder heads, the fire inlet feeder head and the heat preservation feeder head. The fire inlet feeder head is arranged at the tail end of the cross gate. The thick-wall cast steel exhaust manifold casting process is good in mechanical performance, uniform in wall thickness andresistant to high temperature. The thick-wall cast steel exhaust manifold casting mold and method are included. The wall thickness of a casting ranges from 5.5 mm to 6.5 mm, and the weight ranges from 8 Kg to 12 Kg. Technical requirements are met; performance is stable; the problem that molding is difficult to achieve when common casting processes are adopted is solved; and the qualification rateof products is high.

Description

technical field [0001] The invention belongs to the technical field of exhaust manifold casting, and in particular relates to a casting process of thick-wall cast steel exhaust manifold. Background technique [0002] With the continuous improvement of the technical level of the automobile industry, the heat-resistant temperature of automobile exhaust manifolds is getting higher and higher, so that the demand for cast steel exhaust manifolds has increased significantly. Compared with the cast steel volute, the cast steel exhaust manifold has the characteristics of scattered structure and more molten iron flow heads, which leads to a longer flow of molten iron during the filling process, more temperature loss, and a much higher cold barrier ratio than similar volute products. Due to the heavy weight of the product, the thick wall and the high viscosity of the molten steel, the fluidity of the thick-walled parts is long, resulting in a long filling time and a large tendency of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/24B22C9/02B22C9/08B22C9/10
CPCB22C9/02B22C9/082B22C9/10B22C9/24
Inventor 张旭刘松奇齐晓波彭德楼陈果
Owner NANYANG FEILONG AUTOMOBILE PARTS CO LTD
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