阅读说明：本技术 一种液压阀体铸造工艺 (Hydraulic valve body casting process ) 是由 尹猛猛 于 2020-03-30 设计创作，主要内容包括：本发明提供一种液压阀体铸造工艺,其步骤为：(1)配料；(2)铸型制作；(3)铸型预加热；(4)浇铸；(5)加压；(6)冷却；(7)回火；(8)二次回火；(9)检验入库。本发明在熔炼过程中采用耐高温搅拌组件对原料进行充分混合并进行融化,能够实现晶体细化,保证原料的稳定性进而可调高制得的液压阀体铸件稳定性和强度更高,同时在铸件模具中涂覆有一层脱模剂便于液压阀体铸件进行脱模,且不会影响到液压阀体的质量,本发明中在液压阀体铸件冷却过程中采用两次回火,可保证防止液压阀体快速冷却造成阀体发生形变等缺陷出现,采用两次回火,可大大增加液压阀体铸件的韧性,保证了产品的高硬度同时又提高了产品的韧性。(The invention provides a hydraulic valve body casting process, which comprises the following steps: (1) preparing materials; (2) manufacturing a casting mold; (3) preheating a casting mold; (4) casting; (5) pressurizing; (6) cooling; (7) tempering; (8) secondary tempering; (9) and (7) checking and warehousing. According to the invention, the high-temperature-resistant stirring assembly is adopted to fully mix and melt the raw materials in the smelting process, so that crystal refinement can be realized, the stability of the raw materials is ensured, the stability and the strength of the prepared hydraulic valve body casting can be improved, meanwhile, a layer of release agent is coated in the casting mold, so that the hydraulic valve body casting can be conveniently released from the mold, and the quality of the hydraulic valve body is not influenced.)

1. A hydraulic valve body casting process is characterized in that: the feed is prepared from the following raw materials in parts by weight:

ni: 10-15%, Al: 5-8%, Mg: 10-15%, Sn: 0.03 to 0.04%, Sb: 0.03-0.04%, Ca: 0.01-0.02%, Bi: 0.03 to 0.04%, Ti: 0.01-0.02%, Mn: 0.01-0.02%, Y: 0.02 to 0.03%, Mo: 0.03-0.04%, Fe: 0.3-0.6%, Co: 0.8-1.0%, Si: 1-2%, other trace elements: 0.05-0.2%, and the balance of copper and inevitable non-metallic impurities.

2. A hydraulic valve body casting process according to claim 1, wherein: the Ni: 13%, Al: 7%, Mg: 13%, Sn: 0.035%, Sb: 0.035%, Ca: 0.015%, Bi: 0.035%, Ti: 0.015%, Mn: 0.015%, Y: 0.025%, Mo: 0.035%, Fe: 0.4%, Co: 0.9%, Si: 1.5% and other trace elements: 0.7 percent, and the balance of copper and inevitable non-metallic impurities.

3. A hydraulic valve body casting process according to any one of claims 1-2, wherein: the method comprises the following steps:

(1) preparing materials: putting the pure copper ingot into a smelting furnace, and after the pure copper ingot is melted, sequentially adding Ni: 13%, Al: 7%, Mg: 13%, Sn: 0.035%, Sb: 0.035%, Ca: 0.015%, Bi: 0.035%, Ti: 0.015%, Mn: 0.015%, Y: 0.025%, Mo: 0.035%, Fe: 0.4%, Co: 0.9%, Si: 1.5% and other trace elements: 0.7 percent and inevitable non-metallic impurities are mixed and smelted, and in the smelting process, a high-temperature resistant stirring mechanism is used for mixing and stirring until the materials are completely smelted, so that the casting raw materials are obtained, and in the process, the temperature in the smelting furnace is 1100-1400 ℃;

(2) and (3) casting mold manufacturing: manufacturing a corresponding casting mold according to the shape of the hydraulic valve body, and then coating a layer of release agent on an inner cavity of the casting mold;

(3) preheating a casting mold: preheating the casting mold in the step (2), wherein the preheating temperature is 1000-;

(4) casting: standing the raw material solution prepared in the step (1) for 30min, and then casting the raw material solution into an inner cavity of the casting mold prepared in the step (3) to form a hydraulic valve body blank, wherein the casting temperature is 1000-1300 ℃ in the process;

(5) pressurizing: after the casting in the step (4) is finished, immediately pressurizing the casting mold for the first time from the casting opening, wherein the pressurizing time is 50-60min, and then pressurizing for the second time, wherein the pressurizing time is 30-40 min;

(6) and (3) cooling: rapidly cooling the casting mold, reducing the temperature to 800 ℃ for 700-;

(7) tempering: taking out the hydraulic valve body obtained in the step (6) to a heating furnace, heating to the temperature of 500-;

(8) secondary tempering: putting the hydraulic valve body obtained in the step (7) into the heating furnace again, heating the hydraulic valve body to 425 ℃ at the temperature of 400-;

(9) and (6) inspection and warehousing: and (4) cooling the hydraulic valve body obtained in the step (8) to room temperature, machining to obtain a finished hydraulic valve body product, and inspecting and warehousing.

4. A hydraulic valve body casting process according to claim 3, wherein: the pressure in the two pressurizing processes in the step (5) is 0.02-0.04 MPa.

5. A hydraulic valve body casting process according to claim 3, wherein: the casting temperature in the step (4) is 1250 ℃.

Technical Field

The invention relates to the field of hydraulic elements, in particular to a casting process of a hydraulic valve body.

Background

The hydraulic valve is an automatic element operated by pressure oil, is controlled by the pressure oil of a distribution valve, is usually combined with an electromagnetic distribution valve for use, and can be used for remotely controlling the connection and disconnection of oil, gas and water pipeline systems of hydropower stations. It is commonly used for oil circuits of clamping, controlling, lubricating and the like. The direct-acting type and the pilot type are divided into a multi-purpose pilot type.

The hydraulic drive is used to control the hydraulic pressure, flow and direction. The pressure control valve is used for controlling pressure, the flow control valve is used for controlling flow, and the direction control valve is used for controlling on-off and flow direction.

The valve body of the valve is one of important parts of the valve, in the prior art, the valve body can be damaged after long time use, once the valve body is damaged, the destructiveness of the valve and a conveying system is extremely high, the potential safety hazard is caused to the whole conveying system, and in the casting of the existing valve, the utilization rate of raw materials is low, and the structural strength is poor, so that the invention provides a hydraulic valve body casting process to solve the problems.

Disclosure of Invention

The invention aims to provide a hydraulic valve body casting process to solve the technical problem.

In order to solve the technical problems, the invention adopts the following technical scheme:

a hydraulic valve body casting process is characterized in that: the feed is prepared from the following raw materials in parts by weight:

ni: 10-15%, Al: 5-8%, Mg: 10-15%, Sn: 0.03 to 0.04%, Sb: 0.03-0.04%, Ca: 0.01-0.02%, Bi: 0.03 to 0.04%, Ti: 0.01-0.02%, Mn: 0.01-0.02%, Y: 0.02 to 0.03%, Mo: 0.03-0.04%, Fe: 0.3-0.6%, Co: 0.8-1.0%, Si: 1-2%, other trace elements: 0.05-0.2%, and the balance of copper and inevitable non-metallic impurities.

Preferably, the hydraulic valve body casting process comprises the following components in parts by mass:

ni: 13%, Al: 7%, Mg: 13%, Sn: 0.035%, Sb: 0.035%, Ca: 0.015%, Bi: 0.035%, Ti: 0.015%, Mn: 0.015%, Y: 0.025%, Mo: 0.035%, Fe: 0.4%, Co: 0.9%, Si: 1.5% and other trace elements: 0.7 percent, and the balance of copper and inevitable non-metallic impurities.

Preferably, the hydraulic valve body casting process includes the following steps:

(1) preparing materials: putting the pure copper ingot into a smelting furnace, and after the pure copper ingot is melted, sequentially adding Ni: 13%, Al: 7%, Mg: 13%, Sn: 0.035%, Sb: 0.035%, Ca: 0.015%, Bi: 0.035%, Ti: 0.015%, Mn: 0.015%, Y: 0.025%, Mo: 0.035%, Fe: 0.4%, Co: 0.9%, Si: 1.5% and other trace elements: 0.7 percent and inevitable non-metallic impurities are mixed and smelted, and in the smelting process, a high-temperature resistant stirring mechanism is used for mixing and stirring until the materials are completely smelted, so that the casting raw materials are obtained, and in the process, the temperature in the smelting furnace is 1100-1400 ℃;

(2) and (3) casting mold manufacturing: manufacturing a corresponding casting mold according to the shape of the hydraulic valve body, and then coating a layer of release agent on an inner cavity of the casting mold;

(3) preheating a casting mold: preheating the casting mold in the step (2), wherein the preheating temperature is 1000-;

(4) casting: standing the raw material solution prepared in the step (1) for 30min, and then casting the raw material solution into an inner cavity of the casting mold prepared in the step (3) to form a hydraulic valve body blank, wherein the casting temperature is 1000-1300 ℃ in the process;

(5) pressurizing: after the casting in the step (4) is finished, immediately pressurizing the casting mold for the first time from the casting opening, wherein the pressurizing time is 50-60min, and then pressurizing for the second time, wherein the pressurizing time is 30-40 min;

(6) and (3) cooling: rapidly cooling the casting mold, reducing the temperature to 800 ℃ for 700-;

(7) tempering: taking out the hydraulic valve body obtained in the step (6) to a heating furnace, heating to the temperature of 500-;

(8) secondary tempering: putting the hydraulic valve body obtained in the step (7) into the heating furnace again, heating the hydraulic valve body to 425 ℃ at the temperature of 400-;

(9) and (6) inspection and warehousing: and (4) cooling the hydraulic valve body obtained in the step (8) to room temperature, machining to obtain a finished hydraulic valve body product, and inspecting and warehousing.

Preferably, the pressure of the two pressurizing in the step (5) is 0.02-0.04 MPa.

Preferably, the temperature of the casting in the step (4) is 1250 ℃.

The invention has the beneficial effects that:

according to the invention, by designing the hydraulic valve body casting process, the raw materials are fully mixed and melted by adopting the high-temperature-resistant stirring assembly in the smelting process, crystal refinement can be realized, the stability of the raw materials is ensured, the stability and strength of the prepared hydraulic valve body casting can be further improved, meanwhile, a layer of release agent is coated in the casting mold, the hydraulic valve body casting is convenient to demould, and the quality of the hydraulic valve body is not influenced.

Detailed Description

The present invention will be further described with reference to specific embodiments for the purpose of facilitating an understanding of technical means, characteristics of creation, objectives and functions realized by the present invention, but the following embodiments are only preferred embodiments of the present invention, and are not intended to be exhaustive. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.