WO2017114078A1 - Method for preparing engine component - Google Patents

Method for preparing engine component Download PDF

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Publication number
WO2017114078A1
WO2017114078A1 PCT/CN2016/107877 CN2016107877W WO2017114078A1 WO 2017114078 A1 WO2017114078 A1 WO 2017114078A1 CN 2016107877 W CN2016107877 W CN 2016107877W WO 2017114078 A1 WO2017114078 A1 WO 2017114078A1
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Prior art keywords
preparing
sand
coating
component
mold
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PCT/CN2016/107877
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French (fr)
Chinese (zh)
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张建勋
侯晓翠
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张建勋
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Publication of WO2017114078A1 publication Critical patent/WO2017114078A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/22—Moulds for peculiarly-shaped castings

Definitions

  • the invention belongs to the technical field of metal investment precision casting, and in particular relates to a method for preparing an engine component.
  • Mold precision casting is an advanced casting forming process, which is used to realize complex, thin-walled and precision parts forming. It has great advantages in precision jewellery, aero-engines and other precision molded parts.
  • the traditional investment casting process is used. Fusible materials (such as wax) are made into a fusible model (abbreviated as investment), which is coated with several layers of special refractory coatings, dried and hardened to form a monolithic module, and then melted from the module.
  • ceramic sand is often used in the production process of investment casting. The mold shell broken after casting is difficult to recover from sand and has great environmental pollution. Therefore, it is very necessary to find a high-performance and environmentally-friendly mold preparation method. Is necessary.
  • the gasoline engine can reach 1050 °C, the size of the turbocharger impeller and the turbine is not large, the diameter is generally less than 100mm, but the rotation speed is very high, up to 250,000r/min, and it can work continuously under high temperature in a harsh working environment, so the material and performance The requirements are very high.
  • the present invention discloses a preparation method of an environmentally-friendly precision casting mold shell, which can efficiently obtain a casting mold shell, and adopts environmentally friendly materials to protect the environment and resources.
  • a method for preparing an engine component comprising the steps of:
  • (1) preparing a mold shell comprising: a. preparing a corresponding wax mold, a casting system, a riser according to the shape of the desired part, and bonding into a wax module; b. using a suitable ratio of zircon powder, silica sol , fine wood chips, n-octanol, cobalt aluminate mixed to obtain a surface coating, coated with a wax module after the surface sand, the surface sand component is alumina sand and fine wood chips, c.
  • the back layer coating is prepared, the back sand is hung after the wax module is applied, the sand is repeatedly suspended after several times, and d. dewaxing and roasting to obtain a mold shell.
  • alloying ingredients wherein the alloy contains, by atomic percentage, chemical composition: Al: 44.0 to 47.0 at%, V: 0.5 to 1.2 at%, Cr: 0.4 to 1.6 at%, Nb: 2 to 7 at%, B : 0.2 to 0.8 at%, C: 1.0 to 1.3 at%, N: 0.3 to 0.5%, and the balance being Ti.
  • step (3) smelting casting, adding the alloy component described in step (2) to the crucible of the induction melting furnace, evacuating to 10 -4 Pa, blowing in argon gas protection, loading power to 350-400 KW, heating 20- After 25 minutes, the temperature reached 1600-1800 ° C, the alloy material was completely melted and then kept for 10 minutes, then the crucible was turned over, the crucible was turned in a vacuum induction melting furnace, and the alloy liquid was poured into the mold shell obtained in the step (1).
  • the invention adopts fine wood chips and crop straw fiber as the shell material, reduces the use amount of the refractory material, is beneficial to environmental protection, and adopts a reasonable ratio, and increases the ventilation under the premise of ensuring the strength of the shell.
  • the attapulgite in the back coating is a porous material, which is advantageous for exhausting, reduces the porosity defects of the components, increases the yield, and at the same time reduces the weight of the mold shell, and the raw materials are easily available.
  • a method for preparing an engine component comprising the steps of:
  • (1) preparing a mold shell comprising: a. preparing a corresponding wax mold, a casting system, a riser according to the shape of the desired part, and bonding into a wax module; b. using a suitable ratio of zircon powder, silica sol , fine wood chips, n-octanol, cobalt aluminate mixed to obtain a surface coating, coated with a wax module after the surface sand, the surface sand component is alumina sand and fine wood chips, c.
  • alloying ingredients wherein the alloy contains, by atomic percentage, chemical composition: Al: 44.0 to 47.0 at%, V: 0.5 to 1.2 at%, Cr: 0.4 to 1.6 at%, Nb: 2 to 7 at%, B : 0.2 to 0.8 at%, C: 1.0 to 1.3 at%, N: 0.3 to 0.5%, and the balance being Ti.
  • step (3) smelting casting, adding the alloy component described in step (2) to the crucible of the induction melting furnace, evacuating to 10 -4 Pa, blowing in argon gas protection, loading power to 350-400 KW, heating 20- After 25 minutes, the temperature reached 1600-1800 ° C, the alloy material was completely melted and then kept for 10 minutes, then the crucible was turned over, the crucible was turned in a vacuum induction melting furnace, and the alloy liquid was poured into the mold shell obtained in the step (1).
  • the surface coating is prepared by mixing zircon powder, silica sol, fine wood chips, n-octanol and cobalt aluminate.
  • the zircon powder has a particle size of 300 mesh and the fine wood chip size is 240.
  • the aluminum sand has a particle size of 80-100 mesh, and the fine wood chip has a particle size of 160-200 mesh; the wax module coated with the facial sand is dried for 12-18 h, preferably 15 h;
  • the attapulgite powder particle size is 240 mesh
  • Molai The stone particle size is 240 mesh
  • the straw fiber diameter of the crop is 2-3 mm
  • the silica content of the ethyl silicate hydrolyzate is 20%.
  • step (4) and step (5) repeating step (4) and step (5) 2-4 times until the thickness of the mold shell reaches 6-10 mm, preferably 8 mm, and is dried after sealing;
  • the mold shell after step (6) is dried by steam dewaxing, the dewaxing pressure is 0.4 MPa to 0.8 MPa, the dewaxing time is 6 min to 8 min, and sent to a high temperature resistance furnace at 2-4 ° C.
  • the heating rate of /min is raised to 300-450 ° C, and kept for 1.5 h, then heated to 750-800 ° C at a heating rate of 6-10 ° C / min, held for 1.5 h, and then heated at a heating rate of 2-4 ° C / min.
  • To 1100-1250 ° C heat preservation for 4h, with the furnace cooling, get environmentally friendly casting mold shell.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

A method for preparing an engine component, comprising the steps of preparing a mould shell, preparing an alloy material, smelting and pouring, cooling, and post-treatment; a TiAl-based titanium aluminium compound is used as the component material, able to work continuously for a long duration under a high temperature, improving performance and service life; fine sawdust and crop straw fibre are used as shell-making materials, reducing the amount of fire-resistant materials used and being environmentally-friendly, and a reasonable proportion being used; breathability is increased whilst ensuring moulding cast strength, and using porous attapulgite is beneficial for ventilation, reducing component pore defects, increasing the yield of finished products, and reducing the weight of the mould shell.

Description

一种发动机部件的制备方法Method for preparing engine parts 技术领域Technical field
本发明属于金属熔模精密铸造技术领域，尤其是涉及一种发动机部件的制备方法。The invention belongs to the technical field of metal investment precision casting, and in particular relates to a method for preparing an engine component.
背景技术Background technique
模精密铸造是一种先进的铸造成形工艺，多用于实现复杂、薄壁、精密部件成形，在精密首饰、航空发动机以及其他精密成型件方面具有巨大的优势，传统的熔模精密铸造工艺是用易熔的材料(如蜡料)制成可熔性模型(简称熔模)，在其上涂覆若干层特制的耐火涂料，经过干燥和硬化形成一个整体模组，再从模组中熔失熔模从而获得中空的模壳，然后将模壳进行高温烧结，最后在其中浇注熔融的金属而得到的部件的方法。目前在熔模精密铸造的生产过程中多用陶瓷砂，铸造结束后打碎的模壳存在着型砂回收困难，对环境污染大的问题，因此，寻找一种高性能、环保的模壳制备方法非常有必要。Mold precision casting is an advanced casting forming process, which is used to realize complex, thin-walled and precision parts forming. It has great advantages in precision jewellery, aero-engines and other precision molded parts. The traditional investment casting process is used. Fusible materials (such as wax) are made into a fusible model (abbreviated as investment), which is coated with several layers of special refractory coatings, dried and hardened to form a monolithic module, and then melted from the module. A method of melting a mold to obtain a hollow mold shell, then subjecting the mold shell to high temperature sintering, and finally casting a molten metal therein. At present, ceramic sand is often used in the production process of investment casting. The mold shell broken after casting is difficult to recover from sand and has great environmental pollution. Therefore, it is very necessary to find a high-performance and environmentally-friendly mold preparation method. Is necessary.
全球汽车产量仍在持续增长，由于降低油耗和改善城市空气质量的要求，对低能耗高性能发动机需求量也在日益增大，涡轮增压器能显著提高发动机功率、改善排放、降低油耗，因而采用带涡轮增压器的小型发动机来替代自然吸气的发动机是现代汽车工业的一个基本趋势，由于涡轮部件承受的是发动机高温高压的废气，乘用车柴油机排放废气温度最高大约为850℃，而汽油机则可达1050℃，增压器叶轮和涡轮尺寸不大，一般直径不超过100mm，但转速很高，最高达250000r/min，在恶劣的工作环境下连续高速工作，所以对材料和性能的要求非常高。Global vehicle production continues to grow, and demand for low-energy, high-performance engines is increasing due to lower fuel consumption and improved urban air quality. Turbochargers can significantly increase engine power, improve emissions, and reduce fuel consumption. The use of a small engine with a turbocharger to replace the naturally aspirated engine is a fundamental trend in the modern automotive industry. Since the turbine components are subjected to high temperature and high pressure exhaust of the engine, the exhaust gas temperature of the passenger car diesel engine is up to approximately 850 ° C. The gasoline engine can reach 1050 °C, the size of the turbocharger impeller and the turbine is not large, the diameter is generally less than 100mm, but the rotation speed is very high, up to 250,000r/min, and it can work continuously under high temperature in a harsh working environment, so the material and performance The requirements are very high.
发明内容Summary of the invention
基于以上技术问题，本发明公开了一种环保精铸模壳的制备方法，可以高效的得到铸造模壳，并且采用环保材料，保护了环境与资源。Based on the above technical problems, the present invention discloses a preparation method of an environmentally-friendly precision casting mold shell, which can efficiently obtain a casting mold shell, and adopts environmentally friendly materials to protect the environment and resources.
本发明完整的技术方案包括：The complete technical solution of the present invention includes:
一种发动机部件的制备方法，其特征在于，包括如下步骤：A method for preparing an engine component, comprising the steps of:
(1)制备模壳，包括：a.根据所要得到部件的形状制备相应的蜡模、浇注***、冒口，并粘结成蜡模组；b.采用合适配比的锆英粉，硅溶胶，细木屑，正辛醇，铝酸钴混合搅拌制得面层涂料，涂覆蜡模组后挂面砂，面砂组分为氧化铝砂和细木屑，c.采用合适配比的凹凸棒土粉、莫来石粉、农作物秸秆纤维、硅酸乙酯水解液混合搅拌 制得背层涂料，涂覆蜡模组后挂背砂，重复挂背砂数次后封浆干燥，d.脱蜡焙烧得到模壳。(1) preparing a mold shell, comprising: a. preparing a corresponding wax mold, a casting system, a riser according to the shape of the desired part, and bonding into a wax module; b. using a suitable ratio of zircon powder, silica sol , fine wood chips, n-octanol, cobalt aluminate mixed to obtain a surface coating, coated with a wax module after the surface sand, the surface sand component is alumina sand and fine wood chips, c. using a suitable ratio of attapulgite Powder, mullite powder, crop straw fiber, ethyl silicate hydrolyzate mixed and stirred The back layer coating is prepared, the back sand is hung after the wax module is applied, the sand is repeatedly suspended after several times, and d. dewaxing and roasting to obtain a mold shell.
(2)合金配料，所述的合金按原子百分比的化学成分包含：Al：44.0～47.0at％、V：0.5～1.2at％、Cr：0.4～1.6at％、Nb：2～7at％，B：0.2～0.8at％，C：1.0～1.3at％，N：0.3～0.5％，其余为Ti。(2) alloying ingredients, wherein the alloy contains, by atomic percentage, chemical composition: Al: 44.0 to 47.0 at%, V: 0.5 to 1.2 at%, Cr: 0.4 to 1.6 at%, Nb: 2 to 7 at%, B : 0.2 to 0.8 at%, C: 1.0 to 1.3 at%, N: 0.3 to 0.5%, and the balance being Ti.
(3)熔炼浇注，将步骤(2)中所述的合金组分加入感应熔炼炉的坩埚中，抽真空到10-4Pa，吹入氩气保护，加载功率至350-400KW,加热20-25min后温度到达1600-1800℃，合金材料完全融化后保温10分钟，随后翻转坩埚，在真空感应熔炼炉中翻转坩埚，将合金液浇注至步骤(1)所得模壳中。(3) smelting casting, adding the alloy component described in step (2) to the crucible of the induction melting furnace, evacuating to 10 -4 Pa, blowing in argon gas protection, loading power to 350-400 KW, heating 20- After 25 minutes, the temperature reached 1600-1800 ° C, the alloy material was completely melted and then kept for 10 minutes, then the crucible was turned over, the crucible was turned in a vacuum induction melting furnace, and the alloy liquid was poured into the mold shell obtained in the step (1).
(4)冷却至室温后破真空，将模壳打破，得到部件。(4) After cooling to room temperature, the vacuum was broken, and the mold was broken to obtain a part.
(5)对部件进行热处理，表面喷砂清理等工序。(5) Heat treatment of components, surface blast cleaning and other processes.
(6)对部件表面沉积涂层，所述涂层按原子百分比的化学成分包含B：12.0～14.0at％，C：36.0～44.0at％，V：8.0～12.0at％，Cr：10.0～14.0at％、Nb：5.0～6.0at％，H：6.0～13.0at％。(6) depositing a coating on the surface of the component, the coating containing B: 12.0 to 14.0 at%, C: 36.0 to 44.0 at%, V: 8.0 to 12.0 at%, and Cr: 10.0 to 14.0 in atomic percent chemical composition. At%, Nb: 5.0 to 6.0 at%, and H: 6.0 to 13.0 at%.
本发明相对现有技术，采用细木屑、农作物秸秆纤维作为制壳材料，降低了耐火材料的使用量，既有利于环保，并采用合理的配比，在保证型壳强度的前提下增加了透气性，背层涂料中的凹凸棒土为多孔材料，有利于排气，降低了部件气孔缺陷，增加了成品率，同时使模壳降低了重量，并且原料易得。Compared with the prior art, the invention adopts fine wood chips and crop straw fiber as the shell material, reduces the use amount of the refractory material, is beneficial to environmental protection, and adopts a reasonable ratio, and increases the ventilation under the premise of ensuring the strength of the shell. The attapulgite in the back coating is a porous material, which is advantageous for exhausting, reduces the porosity defects of the components, increases the yield, and at the same time reduces the weight of the mold shell, and the raw materials are easily available.
具体实施方式detailed description
下面结合具体实施方式对本发明做进一步说明。The present invention will be further described below in conjunction with specific embodiments.
一种发动机部件的制备方法，其特征在于，包括如下步骤：A method for preparing an engine component, comprising the steps of:
(1)制备模壳，包括：a.根据所要得到部件的形状制备相应的蜡模、浇注***、冒口，并粘结成蜡模组；b.采用合适配比的锆英粉，硅溶胶，细木屑，正辛醇，铝酸钴混合搅拌制得面层涂料，涂覆蜡模组后挂面砂，面砂组分为氧化铝砂和细木屑，c.采用合适配比的凹凸棒土粉、莫来石粉、农作物秸秆纤维、硅酸乙酯水解液混合搅拌制得背层涂料，涂覆蜡模组后挂背砂，重复挂背砂数次后封浆干燥，d.脱蜡焙烧得到模壳。(1) preparing a mold shell, comprising: a. preparing a corresponding wax mold, a casting system, a riser according to the shape of the desired part, and bonding into a wax module; b. using a suitable ratio of zircon powder, silica sol , fine wood chips, n-octanol, cobalt aluminate mixed to obtain a surface coating, coated with a wax module after the surface sand, the surface sand component is alumina sand and fine wood chips, c. using a suitable ratio of attapulgite Powder, mullite powder, crop straw fiber, ethyl silicate hydrolyzate mixed to obtain a back layer coating, after coating the wax module, hanging the back sand, repeating the hanging sand several times, sealing the pulp to dry, d. dewaxing roasting Get the formwork.
(2)合金配料，所述的合金按原子百分比的化学成分包含：Al：44.0～47.0at％、V：0.5～1.2at％、Cr：0.4～1.6at％、Nb：2～7at％，B：0.2～0.8at％，C：1.0～1.3at％，N：0.3～0.5％，其余为Ti。 (2) alloying ingredients, wherein the alloy contains, by atomic percentage, chemical composition: Al: 44.0 to 47.0 at%, V: 0.5 to 1.2 at%, Cr: 0.4 to 1.6 at%, Nb: 2 to 7 at%, B : 0.2 to 0.8 at%, C: 1.0 to 1.3 at%, N: 0.3 to 0.5%, and the balance being Ti.
(3)熔炼浇注，将步骤(2)中所述的合金组分加入感应熔炼炉的坩埚中，抽真空到10-4Pa，吹入氩气保护，加载功率至350-400KW,加热20-25min后温度到达1600-1800℃，合金材料完全融化后保温10分钟，随后翻转坩埚，在真空感应熔炼炉中翻转坩埚，将合金液浇注至步骤(1)所得模壳中。(3) smelting casting, adding the alloy component described in step (2) to the crucible of the induction melting furnace, evacuating to 10 -4 Pa, blowing in argon gas protection, loading power to 350-400 KW, heating 20- After 25 minutes, the temperature reached 1600-1800 ° C, the alloy material was completely melted and then kept for 10 minutes, then the crucible was turned over, the crucible was turned in a vacuum induction melting furnace, and the alloy liquid was poured into the mold shell obtained in the step (1).
(4)冷却至室温后破真空，将模壳打破，得到部件。(4) After cooling to room temperature, the vacuum was broken, and the mold was broken to obtain a part.
(5)对部件进行热处理，表面喷砂清理等工序。(5) Heat treatment of components, surface blast cleaning and other processes.
(6)对部件表面沉积涂层，所述涂层按原子百分比的化学成分包含B：12.0～14.0at％，C：36.0～44.0at％，V：8.0～12.0at％，Cr：10.0～14.0at％、Nb：5.0～6.0at％，H：6.0～13.0at％。(6) depositing a coating on the surface of the component, the coating containing B: 12.0 to 14.0 at%, C: 36.0 to 44.0 at%, V: 8.0 to 12.0 at%, and Cr: 10.0 to 14.0 in atomic percent chemical composition. At%, Nb: 5.0 to 6.0 at%, and H: 6.0 to 13.0 at%.
另外，具体的，所述的模壳的具体制备工艺为：In addition, specifically, the specific preparation process of the mold shell is:
(1)制备蜡模，根据所要得到部件的形状制备相应的蜡模、浇注***、冒口，并粘结成蜡模组；(1) preparing a wax mold, preparing a corresponding wax mold, a pouring system, a riser according to the shape of the desired part, and bonding into a wax module;
(2)面层涂料制备，将锆英粉、硅溶胶、细木屑、正辛醇、铝酸钴混合搅拌制得面层涂料，所述的锆英粉粒度为300目，细木屑粒度为240目，上述涂料组分的重量配比为：锆英粉：硅溶胶：细木屑：正辛醇：铝酸钴＝(1800-2000)：(140-160)：(100-200)：(1-2)：(2-5)；(2) Preparation of the top layer coating, the surface coating is prepared by mixing zircon powder, silica sol, fine wood chips, n-octanol and cobalt aluminate. The zircon powder has a particle size of 300 mesh and the fine wood chip size is 240. The weight ratio of the above coating components is: zircon powder: silica sol: fine wood chips: n-octanol: cobalt aluminate = (1800-2000): (140-160): (100-200): (1 -2): (2-5);
(3)挂面砂：将所述蜡模组浸入面层涂料池中，随后取出，在旋转条件下向其表面吹风使其涂覆均匀，所述的吹风时间为30s-60s，优选为40s；随后在旋转条件下向其表面洒面砂，所述的面砂为面砂组分为氧化铝砂和细木屑，重量配比为氧化铝砂：细木屑＝(10-15)：1，氧化铝砂的粒度为80-100目，细木屑粒度为160-200目；将涂挂好面砂的蜡模组干燥12-18h，优选为15h；(3) noodles sand: the wax module is immersed in the surface coating pool, and then taken out, and the surface is blown to make it evenly coated under rotating conditions, the blowing time is 30s-60s, preferably 40s; Subsequently, the surface sand is sprinkled under the rotating condition, and the surface sand is made of alumina sand and fine wood chips, and the weight ratio is alumina sand: fine wood chips = (10-15): 1, oxidation The aluminum sand has a particle size of 80-100 mesh, and the fine wood chip has a particle size of 160-200 mesh; the wax module coated with the facial sand is dried for 12-18 h, preferably 15 h;
(4)背层涂料制备，将凹凸棒土粉、莫来石粉、农作物秸秆纤维、硅酸乙酯水解液混合搅拌制得背层涂料，所述的凹凸棒土粉粒度为240目，莫来石粒度为240目，农作物秸秆纤维直径为2-3mm，硅酸乙酯水解液二氧化硅含量为20％，上述涂料组分的重量配比为：凹凸棒土粉：莫来石粉：农作物秸秆纤维：硅酸乙酯水解液＝(350-500)：(1800-2000)：(50-120)：(2-4)；(4) preparation of back layer coating, mixing attapulgite powder, mullite powder, crop straw fiber, ethyl silicate hydrolyzate to obtain a back layer coating, the attapulgite powder particle size is 240 mesh, Molai The stone particle size is 240 mesh, the straw fiber diameter of the crop is 2-3 mm, and the silica content of the ethyl silicate hydrolyzate is 20%. The weight ratio of the above coating components is: attapulgite powder: mullite powder: crop straw Fiber: ethyl silicate hydrolyzate = (350-500): (1800-2000): (50-120): (2-4);
(5)挂背砂，将步骤(3)中干燥后的蜡模组浸入背层涂料池中，随后取出，在旋转条件下向其表面吹风使其涂覆均匀，所述的吹风时间为40s-80s，优选为60s；随后在旋转条件下向其表面洒背砂，所述的背砂组分为莫来石粗粉和农作物秸秆纤维，重量配比为莫来石粗粉：农作物秸秆纤维＝(10-15)：1，莫来石粗粉的粒度为 40-60目，农作物秸秆纤维直径为4-6mm；将涂挂好背砂的蜡模组干燥12-18h，优选为15h；(5) Hanging the sand, immersing the dried wax module in step (3) into the back coating tank, and then taking it out, blowing it to the surface under rotation to make it evenly coated, the blowing time is 40s -80s, preferably 60s; then sprinkle back sand on the surface under rotating conditions, the back sand component is mullite coarse powder and crop straw fiber, and the weight ratio is mullite coarse powder: crop straw fiber =(10-15):1, the particle size of mullite coarse powder is 40-60 mesh, the diameter of the crop straw fiber is 4-6 mm; the wax module coated with the back sand is dried for 12-18 h, preferably 15 h;
(6)重复步骤(4)和步骤(5)2-4次，直到模壳厚度达到6-10mm，优选为8mm，封浆后干燥；(6) repeating step (4) and step (5) 2-4 times until the thickness of the mold shell reaches 6-10 mm, preferably 8 mm, and is dried after sealing;
(7)将步骤(6)封浆干燥后的模壳进行蒸汽脱蜡，脱蜡压力为0.4MPa～0.8MPa，脱蜡时间为6min～8min，送入高温电阻炉中，以2-4℃/min的升温速率升温至300-450℃，保温1.5h，随后以6-10℃/min的升温速率升温至750-800℃，保温1.5h，随后以2-4℃/min的升温速率升温至1100-1250℃，保温4h，随炉冷却，得到环保精铸模壳。 (7) The mold shell after step (6) is dried by steam dewaxing, the dewaxing pressure is 0.4 MPa to 0.8 MPa, the dewaxing time is 6 min to 8 min, and sent to a high temperature resistance furnace at 2-4 ° C. The heating rate of /min is raised to 300-450 ° C, and kept for 1.5 h, then heated to 750-800 ° C at a heating rate of 6-10 ° C / min, held for 1.5 h, and then heated at a heating rate of 2-4 ° C / min. To 1100-1250 ° C, heat preservation for 4h, with the furnace cooling, get environmentally friendly casting mold shell.

Claims (1)

  1. 一种发动机部件的制备方法，其特征在于，包括如下步骤：A method for preparing an engine component, comprising the steps of:
    (1)制备模壳，包括：a.根据所要得到部件的形状制备相应的蜡模、浇注***、冒口，并粘结成蜡模组；b.采用合适配比的锆英粉，硅溶胶，细木屑，正辛醇，铝酸钴混合搅拌制得面层涂料，涂覆蜡模组后挂面砂，面砂组分为氧化铝砂和细木屑，c.采用合适配比的凹凸棒土粉、莫来石粉、农作物秸秆纤维、硅酸乙酯水解液混合搅拌制得背层涂料，涂覆蜡模组后挂背砂，重复挂背砂数次后封浆干燥，d.脱蜡焙烧得到模壳。(1) preparing a mold shell, comprising: a. preparing a corresponding wax mold, a casting system, a riser according to the shape of the desired part, and bonding into a wax module; b. using a suitable ratio of zircon powder, silica sol , fine wood chips, n-octanol, cobalt aluminate mixed to obtain a surface coating, coated with a wax module after the surface sand, the surface sand component is alumina sand and fine wood chips, c. using a suitable ratio of attapulgite Powder, mullite powder, crop straw fiber, ethyl silicate hydrolyzate mixed to obtain a back layer coating, after coating the wax module, hanging the back sand, repeating the hanging sand several times, sealing the pulp to dry, d. dewaxing roasting Get the formwork.
    (2)合金配料，所述的合金按原子百分比的化学成分包含：Al：44.0～47.0at％、V：0.5～1.2at％、Cr：0.4～1.6at％、Nb：2～7at％，B：0.2～0.8at％，C：1.0～1.3at％，N：0.3～0.5％，其余为Ti。(2) alloying ingredients, wherein the alloy contains, by atomic percentage, chemical composition: Al: 44.0 to 47.0 at%, V: 0.5 to 1.2 at%, Cr: 0.4 to 1.6 at%, Nb: 2 to 7 at%, B : 0.2 to 0.8 at%, C: 1.0 to 1.3 at%, N: 0.3 to 0.5%, and the balance being Ti.
    (3)熔炼浇注，将步骤(2)中所述的合金组分加入感应熔炼炉的坩埚中，抽真空到10-4Pa，吹入氩气保护，加载功率至350-400KW,加热20-25min后温度到达1600-1800℃，合金材料完全融化后保温10分钟，随后翻转坩埚，在真空感应熔炼炉中翻转坩埚，将合金液浇注至步骤(1)所得模壳中。(3) smelting casting, adding the alloy component described in step (2) to the crucible of the induction melting furnace, evacuating to 10 -4 Pa, blowing in argon gas protection, loading power to 350-400 KW, heating 20- After 25 minutes, the temperature reached 1600-1800 ° C, the alloy material was completely melted and then kept for 10 minutes, then the crucible was turned over, the crucible was turned in a vacuum induction melting furnace, and the alloy liquid was poured into the mold shell obtained in the step (1).
    (4)冷却至室温后破真空，将模壳打破，得到部件。(4) After cooling to room temperature, the vacuum was broken, and the mold was broken to obtain a part.
    (5)对部件进行热处理，表面喷砂清理等工序。(5) Heat treatment of components, surface blast cleaning and other processes.
    (6)对部件表面沉积涂层，所述涂层按原子百分比的化学成分包含B：12.0～14.0at％，C：36.0～44.0at％，V：8.0～12.0at％，Cr：10.0～14.0at％、Nb：5.0～6.0at％，H：6.0～13.0at％。 (6) depositing a coating on the surface of the component, the coating containing B: 12.0 to 14.0 at%, C: 36.0 to 44.0 at%, V: 8.0 to 12.0 at%, and Cr: 10.0 to 14.0 in atomic percent chemical composition. At%, Nb: 5.0 to 6.0 at%, and H: 6.0 to 13.0 at%.
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