阅读说明：本技术 一种锌合金铸件及其制备方法 (Zinc alloy casting and preparation method thereof ) 是由 贲东建 裴新军 刘光磊 于 2020-12-01 设计创作，主要内容包括：本发明公开了一种锌合金铸件及其制备方法,锌50-60份、铝15-20份、铜10-12份、镁4-6份、钛3-5份和铬3-5份,按照正确的质量比取得合适质量的金属物料,然后放置备用；S2、先将高纯度的锌锭置于坩埚中加热升温至420-430℃,然后依次加入铝块、铜块和钛,连忙升温至800-900℃,在金属溶解过程中,尽可能避免锌锅中合金液的搅动,任何方式的搅动都会导致更多的合金液与空气中氧原子的接触,且严格控制熔炼温度,尽量避免高温,当金属完全溶解后即可；本发明涉及锌合金铸件技术领域。该锌合金铸件及其制备方法,能够让钛提前与碳进行结合,减少了铬与碳的结合,降低了铸件内部的晶间腐蚀,大大的提高了锌合金铸件整体的质量,增加了锌合金铸件的使用寿命。(The invention discloses a zinc alloy casting and a preparation method thereof, wherein 50-60 parts of zinc, 15-20 parts of aluminum, 10-12 parts of copper, 4-6 parts of magnesium, 3-5 parts of titanium and 3-5 parts of chromium are obtained according to a correct mass ratio, and then are placed for later use; s2, firstly, placing a high-purity zinc ingot in a crucible, heating to 420-430 ℃, then sequentially adding an aluminum block, a copper block and titanium, continuously heating to 800-900 ℃, avoiding stirring of alloy liquid in a zinc pot as much as possible in the metal dissolving process, wherein the stirring in any mode can cause more contact of the alloy liquid and oxygen atoms in the air, strictly controlling the melting temperature, avoiding high temperature as much as possible, and only after the metal is completely dissolved; the invention relates to the technical field of zinc alloy castings. According to the zinc alloy casting and the preparation method thereof, titanium can be combined with carbon in advance, the combination of chromium and carbon is reduced, the intergranular corrosion in the casting is reduced, the integral quality of the zinc alloy casting is greatly improved, and the service life of the zinc alloy casting is prolonged.)

1. A zinc alloy casting characterized by: the raw materials comprise the following components in parts by weight: 50-60 parts of zinc, 15-20 parts of aluminum, 10-12 parts of copper, 4-6 parts of magnesium, 3-5 parts of titanium and 3-5 parts of chromium.

2. A zinc alloy casting according to claim 1, wherein: the preparation method specifically comprises the following steps:

s1, obtaining metal materials with proper mass according to the correct mass ratio, and then placing for later use;

s2, firstly, placing a high-purity zinc ingot in a crucible, heating to 420-430 ℃, then sequentially adding an aluminum block, a copper block and titanium, continuously heating to 800-900 ℃, avoiding stirring of alloy liquid in a zinc pot as much as possible in the metal dissolving process, wherein the stirring in any mode can cause more contact of the alloy liquid and oxygen atoms in the air, strictly controlling the melting temperature, avoiding high temperature as much as possible, and only after the metal is completely dissolved;

s3, cooling the material obtained in the step S2 to a temperature of 600-;

s4, adopting a central smelting furnace and a die casting machine smelting furnace as a heat preservation furnace, thereby avoiding large temperature change caused by directly adding a zinc ingot into a zinc pot for smelting, also adopting an advanced molten metal automatic feeding system to keep stable feeding speed, temperature of alloy liquid and liquid level height of the zinc pot, then pouring the material obtained in S3, heating to keep the state of the alloy liquid, then pouring the alloy liquid into a casting mold, finishing the periphery of the casting mold after pouring, avoiding overflow of the alloy liquid all around, and ensuring that the liquid level of the alloy liquid is smooth. (ii) a

S5, cooling the casting mould in the S4 to room temperature, placing the casting on a steel flat plate, mechanically cleaning the periphery and the front and back surfaces of the casting to be smooth, then placing the casting in a vacuum heat treatment furnace, tempering at medium temperature, wherein the vacuum degree is 2Pa, the tempering temperature is 200 ℃, the tempering time is 30min, and cooling to room temperature to obtain the zinc alloy casting.

3. A zinc alloy casting according to claim 2 wherein: in S1, the mass of each material can be determined according to the mass ratio of each material according to the mass of the casting as required.

4. A zinc alloy casting according to claim 2 wherein: in S2, when the alloy liquid needs to be stirred, the alloy liquid needs to be stirred slightly, so that the contact with oxygen can be reduced as much as possible, and the generation of dross can be reduced.

5. The zinc alloy casting dross of claim 2 is effective to protect the alloy from oxidation.

6. A zinc alloy casting according to claim 2 wherein: in the step S5, when cleaning the casting, the burrs and the particle lumps on the surface of the casting are mainly removed.

Technical Field

The invention relates to the technical field of zinc alloy castings, in particular to a zinc alloy casting and a preparation method thereof.

Background

The zinc alloy is formed by adding other elements into zinc as a base, common alloy elements comprise low-temperature zinc alloys such as aluminum, copper, magnesium, cadmium, lead, titanium and the like, the zinc alloy has low melting point and good fluidity, is easy to weld, braze and plastically process, resists corrosion in the atmosphere, and is convenient for recovering and remelting residual wastes; however, the creep strength is low, and dimensional change due to natural aging is likely to occur. The zinc alloy is prepared by a melting method, is die-cast or processed into a material by pressure, and can be divided into a casting zinc alloy and a deformation zinc alloy according to the manufacturing process. The existing zinc alloy castings are more and more widely used, the zinc alloy castings are suitable for pressure casting or gravity casting, various instrument shell castings of electromechanical departments such as automobiles and tractors or pouring bearings of various hoisting equipment, machine tools, water pumps and the like, and high-aluminum high-strength high-wear-resistance cast zinc alloy is developed in recent years.

Traditional zinc alloy foundry goods can not let titanium combine with carbon in advance, has increased the combination of chromium and carbon, has increased the inside intercrystalline corrosion of foundry goods, great reduction the holistic quality of zinc alloy foundry goods, has reduced the life of zinc alloy foundry goods, and the potential safety hazard when also having increased whole use to a certain extent, and holistic processing step is loaded down with trivial details to and can not be to whole protection in the course of working, oxygen can react with the material.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a zinc alloy casting and a preparation method thereof, and solves the problem that the overall effect of the zinc alloy casting is not good.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a zinc alloy casting comprises the following raw materials in parts by weight: 50-60 parts of zinc, 15-20 parts of aluminum, 10-12 parts of copper, 4-6 parts of magnesium, 3-5 parts of titanium and 3-5 parts of chromium.

The invention also discloses a preparation method of the zinc alloy casting, which comprises the following steps:

s1, obtaining metal materials with proper mass according to the correct mass ratio, and then placing for later use;

s2, firstly, placing a high-purity zinc ingot in a crucible, heating to 420-430 ℃, then sequentially adding an aluminum block, a copper block and titanium, continuously heating to 800-900 ℃, avoiding stirring of alloy liquid in a zinc pot as much as possible in the metal dissolving process, wherein the stirring in any mode can cause more contact of the alloy liquid and oxygen atoms in the air, strictly controlling the melting temperature, avoiding high temperature as much as possible, and only after the metal is completely dissolved;

s3, cooling the material obtained in the step S2 to a temperature of 600-;

s4, adopting a central smelting furnace and a die casting machine smelting furnace as a heat preservation furnace, thereby avoiding large temperature change caused by directly adding a zinc ingot into a zinc pot for smelting, also adopting an advanced molten metal automatic feeding system to keep stable feeding speed, temperature of alloy liquid and liquid level height of the zinc pot, then pouring the material obtained in S3, heating to keep the state of the alloy liquid, then pouring the alloy liquid into a casting mold, finishing the periphery of the casting mold after pouring, avoiding overflow of the alloy liquid all around, and ensuring that the liquid level of the alloy liquid is smooth. (ii) a

S5, cooling the casting mould in the S4 to room temperature, placing the casting on a steel flat plate, mechanically cleaning the periphery and the front and back surfaces of the casting to be smooth, then placing the casting in a vacuum heat treatment furnace, tempering at medium temperature, wherein the vacuum degree is 2Pa, the tempering temperature is 200 ℃, the tempering time is 30min, and cooling to room temperature to obtain the zinc alloy casting.

Preferably, in S1, the mass of each material can be determined according to the mass ratio of each material, according to the mass of the casting required.

Preferably, in S2, when the alloy liquid needs to be stirred, the alloy liquid needs to be stirred slightly, so that the contact with oxygen is reduced as much as possible, and the generation of dross is reduced.

Preferably, in S3, frequent skimming is not required, and a thin layer of dross is retained on the surface of the molten alloy liquid to effectively protect the alloy liquid from oxidation.

Preferably, in the step S5, when cleaning the casting, the burrs, the particle lumps and the like on the surface of the casting are mainly removed.

(III) advantageous effects

The invention provides a zinc alloy casting and a preparation method thereof. The method has the following beneficial effects:

(1) the zinc alloy casting and the preparation method thereof comprise the following raw materials in parts by weight: 50-60 parts of zinc, 15-20 parts of aluminum, 10-12 parts of copper, 4-6 parts of magnesium, 3-5 parts of titanium and 3-5 parts of chromium, and S1, obtaining metal materials with proper mass according to a correct mass ratio, and then placing for later use; s2, firstly, placing a high-purity zinc ingot in a crucible, heating to 420-430 ℃, then sequentially adding an aluminum block, a copper block and titanium, continuously heating to 800-900 ℃, avoiding stirring of alloy liquid in a zinc pot as much as possible in the metal dissolving process, wherein the stirring in any mode can cause more contact of the alloy liquid and oxygen atoms in the air, strictly controlling the melting temperature, avoiding high temperature as much as possible, and only after the metal is completely dissolved; the method has the advantages that titanium can be combined with carbon in advance, the combination of chromium and carbon is reduced, the intergranular corrosion inside the casting is reduced, the overall quality of the zinc alloy casting is greatly improved, the service life of the zinc alloy casting is prolonged, the potential safety hazard in the overall use is reduced to a certain extent, the overall processing steps are simple, and the overall protection in the processing process can enable oxygen to react with the zinc alloy casting as far as possible.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides three technical schemes: a zinc alloy casting and a preparation method thereof specifically comprise the following embodiments:

example 1

S1, obtaining metal materials with proper mass according to the correct mass ratio, and then placing for later use;

s2, firstly, 50 parts of high-purity zinc ingot is placed in a crucible to be heated to 420-;

s3, cooling the material obtained in the step S2 to 610 ℃ of 600 plus materials, adding 4 parts of industrial pure magnesium, filling inert gas, uniformly mixing, heating again after the mixture is finished, adding 3 parts of chromium, and melting completely, wherein in the melting process, the slag needs to be removed regularly, a porous disc-shaped slag rake is used for scraping the slag slightly from the lower side of the scum to avoid stirring of alloy liquid as much as possible, the scraped slag is contained, and the slag rake is slightly knocked at the edge of a zinc pot to enable metal liquid to flow back to the zinc pot;

s4, adopting a central smelting furnace and a die casting machine smelting furnace as a heat preservation furnace, thereby avoiding large temperature change caused by directly adding a zinc ingot into a zinc pot for smelting, also adopting an advanced molten metal automatic feeding system to keep stable feeding speed, temperature of alloy liquid and liquid level height of the zinc pot, then pouring the material obtained in S3, heating to keep the state of the alloy liquid, then pouring the alloy liquid into a casting mold, finishing the periphery of the casting mold after pouring, avoiding overflow of the alloy liquid all around, and ensuring that the liquid level of the alloy liquid is smooth. (ii) a

S5, cooling the casting mould in the S4 to room temperature, placing the casting on a steel flat plate, mechanically cleaning the periphery and the front and back surfaces of the casting to be smooth, then placing the casting in a vacuum heat treatment furnace, tempering at medium temperature, wherein the vacuum degree is 2Pa, the tempering temperature is 200 ℃, the tempering time is 30min, and cooling to room temperature to obtain the zinc alloy casting.

Example 2

S1, obtaining metal materials with proper mass according to the correct mass ratio, and then placing for later use;

s2, firstly, placing 60 parts of high-purity zinc ingot in a crucible, heating to 420-;

s3, cooling the material obtained in the step S2 to 610 ℃ of 600 plus materials, adding 6 parts of industrial pure magnesium, filling inert gas, uniformly mixing, heating again after the mixture is finished, adding 5 parts of chromium, and melting completely, wherein in the melting process, slag needs to be removed regularly, a porous disc-shaped slag rake is used for scraping the slag gently from the lower side of the dross to avoid stirring of alloy liquid as much as possible, the scraped slag is contained, and the slag rake is slightly knocked at the edge of a zinc pot to enable metal liquid to flow back to the zinc pot;

s4, adopting a central smelting furnace and a die casting machine smelting furnace as a heat preservation furnace, thereby avoiding large temperature change caused by directly adding a zinc ingot into a zinc pot for smelting, also adopting an advanced molten metal automatic feeding system to keep stable feeding speed, temperature of alloy liquid and liquid level height of the zinc pot, then pouring the material obtained in S3, heating to keep the state of the alloy liquid, then pouring the alloy liquid into a casting mold, finishing the periphery of the casting mold after pouring, avoiding overflow of the alloy liquid all around, and ensuring that the liquid level of the alloy liquid is smooth. (ii) a

S5, cooling the casting mould in the S4 to room temperature, placing the casting on a steel flat plate, mechanically cleaning the periphery and the front and back surfaces of the casting to be smooth, then placing the casting in a vacuum heat treatment furnace, tempering at medium temperature, wherein the vacuum degree is 2Pa, the tempering temperature is 200 ℃, the tempering time is 30min, and cooling to room temperature to obtain the zinc alloy casting.

Example 3

S1, obtaining metal materials with proper mass according to the correct mass ratio, and then placing for later use;

s2, firstly placing 55 parts of high-purity zinc ingot into a crucible, heating to 420-430 ℃, then sequentially adding 18 parts of aluminum block, 11 parts of copper block and 4 parts of titanium, continuously heating to 800-900 ℃, avoiding stirring of alloy liquid in a zinc pot as much as possible in the metal dissolving process, wherein the stirring in any mode can cause more contact of the alloy liquid and oxygen atoms in the air, strictly controlling the melting temperature and avoiding high temperature as much as possible, and when the metal is completely dissolved;

s3, cooling the material obtained in the step S2 to 610 ℃ of 600 plus materials, adding 5 parts of industrial pure magnesium, filling inert gas, uniformly mixing, heating again after the mixture is finished, adding 4 parts of chromium, and melting completely, wherein in the melting process, slag needs to be removed regularly, a porous disc-shaped slag rake is used for scraping the slag gently from the lower side of the dross to avoid stirring of alloy liquid as much as possible, the scraped slag is contained, and the slag rake is slightly knocked at the edge of a zinc pot to enable metal liquid to flow back to the zinc pot;

s4, adopting a central smelting furnace and a die casting machine smelting furnace as a heat preservation furnace, thereby avoiding large temperature change caused by directly adding a zinc ingot into a zinc pot for smelting, also adopting an advanced molten metal automatic feeding system to keep stable feeding speed, temperature of alloy liquid and liquid level height of the zinc pot, then pouring the material obtained in S3, heating to keep the state of the alloy liquid, then pouring the alloy liquid into a casting mold, finishing the periphery of the casting mold after pouring, avoiding overflow of the alloy liquid all around, and ensuring that the liquid level of the alloy liquid is smooth. (ii) a

S5, cooling the casting mould in the S4 to room temperature, placing the casting on a steel flat plate, mechanically cleaning the periphery and the front and back surfaces of the casting to be smooth, then placing the casting in a vacuum heat treatment furnace, tempering at medium temperature, wherein the vacuum degree is 2Pa, the tempering temperature is 200 ℃, the tempering time is 30min, and cooling to room temperature to obtain the zinc alloy casting.

Procedure of experiment

1. And (3) detecting the tensile strength: the tensile strength of the products obtained in the three examples was measured, and the test data was recorded after several tests, and then the average value was obtained.

2. And (3) detecting the elongation: the elongation test was performed on the products obtained in the three examples, and the test data was recorded for several times, and then the average value was obtained.

3. And (3) hardness detection: and respectively carrying out hardness detection on the products prepared in the three embodiments, and recording the test results.

Results of the experiment

The tensile strength, the elongation and the hardness of daily zinc alloy castings on the market are randomly selected as a control group, the tensile strength, the elongation and the hardness of the daily zinc alloy castings are respectively detected under the conditions consistent with the above conditions, and the results are recorded to obtain the following table, which shows that the tensile strength, the elongation and the hardness of the product prepared in the example 2 have the best effects.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.