Magnesium alloy suction tube

Abstract

The invention discloses a magnesium alloy formula for a straw and a method for preparing the magnesium alloy straw by adopting the formula, and the magnesium alloy comprises the following components in percentage by weight: 0.2-2.0% of Zn, 0.2-0.6% of Mn, 0.1-0.5% of Sr, 0.5-1.5% of Y and the balance of Mg. The magnesium alloy suction pipe is prepared by taking the magnesium alloy as a raw material, and the preparation method comprises the following steps: firstly, preparing a magnesium alloy casting rod according to the formula, then putting the casting rod into a resistance furnace to be heated to 280-420 DEG C, heating a mold to 300-420 DEG C, then taking out the magnesium alloy rod, putting the magnesium alloy rod into an extrusion cylinder which is preheated to 320-380 DEG C in advance, and carrying out extrusion production on a pipe material profile, so as to obtain the magnesium alloy suction pipe. Obtaining the magnesium alloy extruded tube for the suction tube; the extruded pipe material is sawn into the length required by the follow-up rolling or drawing process, follow-up rolling or drawing production is carried out, 1-3 times of intermediate annealing treatment is cooperatively carried out in the rolling or drawing process, and after 2-4 passes of rolling or drawing, the magnesium alloy suction pipe material meeting the requirements for the size and surface quality of the magnesium alloy suction pipe is obtained; and then sawing according to the length size of the suction pipe, cutting an inclined opening, and polishing a round corner to obtain the magnesium alloy suction pipe meeting the size requirement.

Description

Technical Field

[0001] The invention relates to a method for extruding and rolling a magnesium alloy straw, and belongs to the field of straw manufacturing. Background Art

[0002] Currently, beverage straws come in three main categories: plastic, paper, and metal. Plastic straws are the most widely used. Because plastic straws degrade extremely slowly in the natural environment, they are more likely to pollute soil, water, air, and the environment during the degradation process. In response, the Chinese government has issued a series of environmental protection policies in recent years, gradually banning and restricting the use of non-degradable plastics. In July 2020, the National Development and Reform Commission, the Ministry of Ecology and Environment, and nine other departments issued the "Notice on Solidly Promoting Plastic Pollution Control," requiring a nationwide ban on the use of non-degradable, disposable plastic straws in the catering industry by the end of 2020. Against this backdrop, paper straws have gradually replaced plastic straws and become the new mainstay of the straw market. However, consumers have a poor experience with paper straws. Current paper straws soften after being left in beverage cups for extended periods, affecting the taste of the beverage and thus reducing consumer demand. Compared with disposable plastic straws and paper straws, metal straws have the advantages of beautiful appearance, reusability, long service life, and convenient recycling. They are green and environmentally friendly products and an important development direction for the straw industry. Metal straws include stainless steel straws and a small number of titanium alloy straws. Stainless steel itself is a commonly used material for tableware. Stainless steel straws have the advantages of beautiful appearance and corrosion resistance, but have disadvantages such as heavy weight and containing heavy metals such as nickel and chromium that are harmful to the human body; titanium alloy straws have the advantages of light weight, corrosion resistance, and beautiful appearance, but are expensive. Magnesium alloy is the lightest metal structural material, and the density of magnesium is only 1.74g / cm 3 , which is 2 / 3 of aluminum and 1 / 4 of steel, and is widely used in aerospace, automotive, rail transportation, sports equipment, textile machinery, medical devices, human implants and other fields. Magnesium and zinc are both essential trace elements for the human body. Medical research shows that magnesium and zinc have a protective effect on cardiovascular and cerebrovascular systems and are beneficial elements needed by the human body. However, due to the close-packed hexagonal crystal structure of conventional magnesium alloys, their plastic processing properties are poor, and they are easily deformed and cracked during plastic deformation processing. Currently, magnesium alloy straws are not available on the market. Summary of the Invention

[0003] Purpose of the Invention

[0004] In response to the poor consumer experience of paper straws used in the existing straw market and the heavy metal problem of stainless steel straws, the first purpose of the present invention is to provide a magnesium alloy that is lightweight, easy to deform and process, and beneficial to human health. The second purpose is to provide a method for extruding, rolling and preparing magnesium alloy tubes and magnesium alloy straws.

[0005] Technical solution: The magnesium alloy described in the present invention is characterized in that it includes the following components in weight percentage: 0.2-2.0% Zn, 0.2-0.6% Mn, 0.1-0.5% Sr, 0.5-1.5% Y, and the balance Mg.

[0006] A magnesium alloy melting and casting process, the preparation method of which comprises the following steps:

[0007] (1) Ingredients: According to the expected magnesium alloy bar composition and smelting weight ingredients, magnesium ingots, zinc ingots, Mg-10Mn, Mg-10Sr, and Mg-10Y master alloys are weighed respectively.

[0008] (2) Melting: Add the prepared magnesium ingot into the magnesium alloy melting furnace, and sprinkle the magnesium alloy flux on the top. Heat it to 700-750℃ and melt it. Then add the zinc ingot, Mg-10Mn, Mg-10Sr and Mg-10Y intermediate alloy respectively and stir them thoroughly. After sampling and alloy composition analysis, refine it for 30 minutes, let it stand, cool it to 680-700℃ and wait for casting.

[0009] (3) Casting: The magnesium alloy melt cooled to 680-700°C is cast into a casting crystallizer, and the magnesium alloy solidifies to form a magnesium alloy cast rod.

[0010] 3. A method for extruding a magnesium alloy tube for a straw, characterized by the following steps:

[0011] (1) Machining the magnesium alloy cast rod into the rod size required for extrusion.

[0012] (2) The machined magnesium alloy extruded rod is placed in a resistance furnace and heated to 280°C to 420°C, and the mold is heated to 300°C to 420°C. The magnesium alloy rod is then taken out and placed in an extrusion barrel preheated to 320°C to 380°C for tube extrusion production to obtain a magnesium alloy extruded tube for straws.

[0013] 4. A method for rolling or drawing magnesium alloy tube material for straws

[0014] Magnesium alloy extruded tubes are cut to the required length according to the tube rolling or drawing equipment process requirements. Rolling or drawing is then performed, and one to three intermediate annealing treatments are performed during the rolling or drawing process. After two to four rolling or drawing passes, magnesium alloy pipettes meeting the required dimensions and surface quality are obtained. The annealing process between rolling or drawing steps is at 350°C for 30 minutes.

[0015] 5. A method for forming a magnesium alloy straw, characterized by the following steps:

[0016] (1) preparing magnesium alloy rolled or drawn tubes meeting the diameter size requirements according to claim 4;

[0017] (2) According to the specific straw length requirements, the rolled magnesium alloy tube is sawed, beveled, and rounded to remove burrs to obtain a magnesium alloy straw that meets the external size requirements.

[0018] (3) The processed magnesium alloy straws are cleaned to remove surface oil and other contaminants to make the surface clean, and then dried to remove surface moisture to obtain magnesium alloy straws that meet product quality requirements.

[0019] Beneficial effects:

[0020] Magnesium has a close-packed hexagonal crystal structure and poor plasticity, making it prone to cracking and shattering during extrusion or rolling. The present invention uses magnesium as a base material and adds trace elements such as zinc, manganese, strontium, and rare earth yttrium to enhance the strength of the magnesium metal, refine the magnesium alloy grains, increase the plasticity of the magnesium alloy, and enhance the purity and corrosion resistance of the magnesium alloy. The magnesium alloy straws of the present invention significantly improve their plastic processing capabilities. Combined with an appropriate intermediate annealing process, the magnesium alloy straws can be smoothly rolled or drawn at room temperature, resolving the process difficulty of room-temperature rolling or drawing of magnesium alloy pipes and enabling the rolling and drawing production of magnesium alloy straws. Furthermore, magnesium and zinc are essential elements for the human body and are harmless to the body. Furthermore, drinking water with a magnesium straw can make the water weakly alkaline and replenish magnesium ions and hydrogen, which are beneficial to the human body, thus providing health benefits. DETAILED DESCRIPTION

[0021] Example 1

[0022] 1) 500 kg of magnesium alloy was prepared according to the material formula of the present invention, including 10 kg of zinc ingot, 30 kg of Mg-10Mn master alloy, 25 kg of Mg-10Sr master alloy, 50 kg of Mg-10Y master alloy, and 385 kg of magnesium ingot; the ingredients were 2% Zn, 0.6% Mn, 0.5% Sr, 1% Y, and the balance Mg.

[0023] 2) Melting and Casting: Add the magnesium ingot into the magnesium alloy melting furnace and sprinkle the magnesium alloy solvent on the top. Heat it to 730℃ and melt it. Then add the zinc ingot and Mg-10Mn, Mg-10Sr and Mg-10Y master alloys respectively. Stir them thoroughly to make the alloy composition uniform. Take samples for component analysis and add refining agent for refining treatment. After standing for 30 minutes, cool it to 680℃ and cast it into magnesium alloy rods with a diameter of φ92.

[0024] 3) The magnesium alloy cast rods were sawn, peeled and machined into billet sizes of φ82×250.

[0025] 4) Extrusion production: The machined magnesium alloy extrusion billet is placed in a resistance furnace and heated to 380°C. The die is heated to 350°C. The magnesium alloy bar is then taken out and placed into an extrusion barrel preheated to 380°C for tube extrusion production to obtain a φ14×1.3 magnesium alloy extruded tube.

[0026] 5) Rolling or drawing production: According to the process requirements of the tube rolling or drawing equipment, the magnesium alloy extruded tube is cut into 3 meters and rolled for production. During the rolling or drawing process, two intermediate annealing treatments are carried out. After three rolling or drawing passes, a φ12×1.0 magnesium alloy straw tube is obtained.

[0027] 6) According to the specific straw length requirements, the rolled magnesium alloy tube is sawed, beveled, and rounded to remove burrs to obtain a magnesium alloy straw that meets the required external dimensions.

[0028] 7) Cleaning: Clean the processed magnesium alloy straws to remove surface oil and other contaminants to make the surface clean, and then dry and disinfect them to remove surface moisture.

[0029] Example 2

[0030] 1) According to the material formula ratio of the present invention, 500 kg of magnesium alloy was prepared, and 5 kg of zinc ingot, 25 kg of Mg-10Mn master alloy, 20 kg of Mg-10Sr master alloy, 25 kg of Mg-10Y master alloy, and 430 kg of magnesium ingot were weighed respectively. The ingredients were 1% Zn, 0.5% Mn, 0.4% Sr, 0.5% Y, and the balance Mg.

[0031] 2) Melting and Casting: A magnesium ingot is placed in a magnesium alloy melting furnace, and magnesium alloy flux is sprinkled on top. After heating to 750°C and melting, a zinc ingot and Mg-10Mn, Mg-10Sr, and Mg-10Y master alloys are added. The mixture is thoroughly stirred to achieve uniform composition. Samples are taken for component analysis, and a refining agent is added for refining. After a 30-minute rest period, the mixture is cooled to 700°C and cast into magnesium alloy rods with a diameter of φ92. 3) The magnesium alloy rods are sawn, peeled, and machined into billets with a size of φ82×250.

[0032] 4) Extrusion production: The machined magnesium alloy extrusion billet is placed in a resistance furnace and heated to 380°C, and the mold is heated to 350°C. The magnesium alloy rod is then taken out and placed in an extrusion barrel preheated to 380°C for tube extrusion production to obtain a φ14×1.3 magnesium alloy extruded tube; 5) Rolling or drawing production: According to the process requirements of the tube rolling or drawing equipment, the magnesium alloy extruded tube is cut into 3 meters and rolled for production. During the rolling or drawing process, two intermediate annealing treatments are carried out. After three rolling or drawing passes, a φ10×1.0 magnesium alloy straw tube is obtained.

[0033] 6) According to the specific straw length requirements, the rolled magnesium alloy tube is sawed, beveled, and rounded to remove burrs to obtain a magnesium alloy straw that meets the required external dimensions.

[0034] 7) Cleaning: Clean the processed magnesium alloy straws to remove surface oil and other contaminants to make the surface clean, and then dry them to remove surface moisture.

[0035] 8) Plastic packaging of finished products

[0036] Example 3

[0037] 1) According to the material formula ratio of the present invention, 500 kg of magnesium alloy was prepared, and 2.5 kg of zinc ingot, 10 kg of Mg-10Mn master alloy, 5 kg of Mg-10Sr master alloy, 75 kg of Mg-10Y master alloy, and 407.5 kg of magnesium ingot were weighed respectively. The ingredients were 0.5% Zn, 0.2% Mn, 0.1% Sr, 1.5% Y, and the balance Mg.

[0038] 2) Melting and Casting: Add the magnesium ingot into the magnesium alloy melting furnace, and sprinkle the magnesium alloy solvent on the top. Heat it to 720℃ and melt it. Then add the zinc ingot and Mg-10Mn, Mg-10Sr, and Mg-10Y master alloys respectively. Stir them thoroughly to make the alloy composition uniform. Take samples for component analysis, add refining agent for refining treatment, let it stand for 30 minutes, then cool it to 680℃ and cast it into magnesium alloy rods with a diameter of φ95.

[0039] 3) The magnesium alloy cast rods were sawn, peeled and machined into billet sizes of φ83×250.

[0040] 4) Extrusion production: The machined magnesium alloy extrusion billet is placed in a resistance furnace and heated to 380°C. The die is heated to 350°C. The magnesium alloy bar is then taken out and placed in an extrusion barrel preheated to 380°C for tube extrusion production to obtain a φ12×1.2 magnesium alloy extruded tube.

[0041] 5) Rolling or drawing production: According to the process requirements of the tube rolling or drawing equipment, the magnesium alloy extruded tube is cut into 3 meters and rolled for production. During the rolling or drawing process, two intermediate annealing treatments are carried out. After three rolling or drawing passes, the φ8×1.0 magnesium alloy straw tube is obtained.

[0042] 6) According to the specific straw length requirements, the rolled magnesium alloy tube is sawed, beveled, and rounded to remove burrs to obtain a magnesium alloy straw that meets the required external dimensions.

[0043] 7) Cleaning: Clean the processed magnesium alloy straws to remove surface oil and other contaminants to make the surface clean, and then dry them to remove surface moisture.

[0044] 8) Plastic packaging of finished products.

Claims

1. A magnesium alloy, characterized in that: The following components are included by weight percentage: 0.2-2.0% Zn, 0.2-0.6% Mn, 0.1-0.5% Sr, 0.5-1.5% Y, and the balance Mg.

2. A magnesium alloy casting process, according to claim 1, the magnesium alloy casting preparation method comprises the following steps: (1) Batching: According to the expected magnesium alloy bar composition and smelting weight batching, magnesium ingot, zinc ingot, Mg-10Mn, Mg-10Sr, and Mg-10Y master alloy are weighed respectively. (2) Melting: Add the prepared magnesium ingot into the magnesium alloy melting furnace, sprinkle the magnesium alloy flux on the top, heat to 700-750℃ and melt, then add zinc ingot, Mg-10Mn, Mg-10Sr and Mg-10Y master alloy respectively, stir them thoroughly, take samples for alloy composition analysis and after passing, refine for 30 minutes, let it stand, cool to 680-700℃ and wait for casting. (3) Casting: The magnesium alloy melt cooled to 680-700°C is cast into a casting crystallizer, and the magnesium alloy solidifies to form a magnesium alloy cast rod.

3. A method for extruding magnesium alloy tube material for straws, characterized in that Follow these steps: (1) A magnesium alloy cast rod is prepared according to claim 1 and claim 2, and peeled to a rod size required for extrusion. (2) The machined magnesium alloy extruded rod is placed in a resistance furnace and heated to 280°C to 420°C, and the mold is heated to 300°C to 420°C. The magnesium alloy rod is then taken out and placed in an extrusion barrel preheated to 320°C to 380°C for tube extrusion production to obtain a magnesium alloy extruded tube for straws.

4. A method for rolling or drawing a magnesium alloy tube material for a straw, characterized in that Follow these steps: (1) Preparing a magnesium alloy extruded tube according to claim 3; (2) According to the process requirements of the tube rolling or drawing equipment, the magnesium alloy extruded tube is cut to the required length, and then rolled or drawn. During the rolling or drawing process, 1 to 3 intermediate annealing treatments are carried out. After 2 to 4 rolling or drawing processes, a magnesium alloy straw tube material that meets the magnesium alloy straw size and surface quality requirements is obtained. The annealing process during the rolling or drawing process is to keep the temperature at 350°C for 30 minutes.

5. A method for forming a magnesium alloy straw, characterized in that Follow these steps: (1) According to claim 4, a magnesium alloy rolled or drawn tube meeting the diameter size requirements is prepared; (2) According to the specific straw length requirements, the rolled magnesium alloy tube is sawed, beveled, and rounded to remove burrs, so as to obtain a magnesium alloy straw that meets the external dimension requirements. (3) The processed magnesium alloy straws are cleaned to remove surface oil and other contaminants to make the surface clean, and then dried to remove surface moisture to obtain magnesium alloy straws that meet product quality requirements.