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Spiracula seat of car engine as well as manufacturing technology thereof

A technology of automobile engine and manufacturing process, applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems of low casting yield, valve seat heat resistance, wear resistance and other problems, and achieve high casting pass rate, Good compactness and moderate hardness

Inactive Publication Date: 2009-12-23
上海广凌气门座有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the valve seats used in automobile engines are generally made of chromium-molybdenum alloy (the chromium content is less than 20%), and the investment lost wax casting is adopted. The process is characterized by high dimensional accuracy, but it has low casting yield. Disadvantages such as unsatisfactory heat resistance and wear resistance of the valve seat

Method used

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  • Spiracula seat of car engine as well as manufacturing technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of automobile engine valve seat (its outer diameter × inner diameter × height is Φ53 × Φ45 × 10mm), its composition (weight %) is 34.36% chromium, 2.26% molybdenum, 2.04% carbon, 1.93% silicon, 0.29% nickel, 0.35% manganese, balance iron.

[0023] The manufacturing process of above-mentioned automobile engine valve seat comprises the following steps:

[0024] (1) Making fusible molds and preparing mold shells.

[0025] (2) Baking the formwork at 860° C. for 2 hours.

[0026] (3) The alloy is smelted in an intermediate frequency smelting furnace at a melting temperature of 1680°C, adding 0.05% ferrotitanium and 1 / 10,000th aluminum powder, and the pouring temperature is 1660°C. .

[0027] (4) Normalize the casting in the box type, the normalizing temperature is 960°C, the holding time is 150 minutes, and air-cooled.

[0028] (5) Gold cutting processing.

Embodiment 2

[0030] A kind of automobile engine valve seat (its outer diameter × inner diameter × height is Φ33×Φ28.5×7.2mm), its composition (weight %) is 33.64% chromium, 2.28% molybdenum, 1.98% carbon, 1.96% silicon, 0.32 % nickel, 0.42% manganese, and the balance is iron.

[0031] The manufacturing process of the above-mentioned automobile engine valve seat comprises the following steps:

[0032] (1) Making fusible molds and preparing mold shells.

[0033] (2) Baking the formwork at 850° C. for 1.5 hours.

[0034] (3) The alloy is smelted in an intermediate frequency smelting furnace at a melting temperature of 1650°C, adding 0.05% ferrotitanium and 1 / 10,000th aluminum powder, and the pouring temperature is 1560°C.

[0035] (4) Normalize in a box-type resistance furnace, the normalizing temperature is 940°C, the holding time is 130 minutes, and air-cooled.

[0036] (5) Gold cutting processing.

[0037] The above-mentioned embodiments 1 and 2, two valve seats of different sizes, the...

Embodiment 3

[0041] An automobile engine valve seat (its outer diameter × inner diameter × height is Φ33×Φ28.5×7.2mm), its composition (weight %) is 33% chromium, 1.8% molybdenum, 1.8% carbon, 1.8% silicon, 0.30 % nickel, 0.40% manganese, and the balance is iron.

[0042] The manufacturing process of the above-mentioned automobile engine valve seat comprises the following steps:

[0043] (1) Making fusible molds and preparing mold shells.

[0044] (2) Baking the formwork at 700° C. for 3 hours.

[0045] (3) The alloy is smelted in an intermediate frequency smelting furnace at a melting temperature of 1400°C, adding 0.06% ferro-titanium and 1 / 10,000th aluminum powder, and the pouring temperature is 1300°C.

[0046] (4) Normalize in a box-type resistance furnace, the normalizing temperature is 900°C, the holding time is 200 minutes, and air-cooled.

[0047] (5) Gold cutting processing.

[0048] The requirements of hardness, metallographic structure and porosity of this embodiment are the...

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Abstract

The invention relates to a valve seat of an automobile engine and the manufacturing process; wherein, the components of the valve seat (by weight percentage) are as follows: 33 - 35% chromium, 2.0 - 2.5% molybdenum, 1.8 - 2.3% carbon, 1.8 - 2.1% silicon, less than 0.5% nickel, less than 1% manganese, and the rest being iron. The manufacturing process of the valve seat comprises the following steps: making a investment molding and preparing a mould, calcining the mould shell, calcining and pouring the alloy, hot treating the casting, as well as cutting and machining the metal. Compared with the prior art, the product by manufacturing process of the valve seat for automobile engine has the advantages of good compactness, modest hardness, less liability to loosening of the casting, high pass rate, and much lower production costs. The products has a lot of desirable properties, such as the resistance to heat, wear and corrosion, and are therefore applicable to large and medium-sized automobile engines.

Description

technical field [0001] The invention relates to automobile engine parts and its manufacturing process, in particular to an automobile engine valve seat and its manufacturing process. Background technique [0002] At present, the valve seats used in automobile engines are generally made of chromium-molybdenum alloy (the chromium content is less than 20%), and the investment lost wax casting is adopted. The process is characterized by high dimensional accuracy, but it has low casting yield. The heat resistance and wear resistance of the valve seat are not ideal. Especially seem powerless to be used on medium and high-horsepower automobile engine. Contents of the invention [0003] The purpose of the present invention is in order to overcome the shortcoming that above-mentioned prior art exists, thereby provide a kind of high dimensional accuracy, heat-resistant, wear-resistant and be applicable to the automobile engine valve seat of medium and high-horsepower automobile and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L3/02C22C37/06C22C38/22
Inventor 唐云龙
Owner 上海广凌气门座有限公司
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