A method for avoiding cross contamination of aluminum-scandium materials by shearing

Abstract

The present invention discloses a method for avoiding cross contamination of material shearing, comprising the following steps: 1) removing material residues on the cutting blade of a shearing machine; 2) polishing the cutting blade with 100-150 mesh sandpaper to eliminate surface pits; 3) polishing the cutting blade with 300-350 mesh sandpaper to eliminate scratches; 4) blowing the cutting blade until there is no dust on its surface, and wiping the cutting blade surface with dust-free paper until it is clean and bright; 5) fine grinding the cutting blade; 6) repeating step 4; 7) using the material to be sheared to shear and wash the knife in the shearing area for more than 4 times. The method of the present invention can avoid cross contamination caused by mixed shearing of different materials to the greatest extent, reduce material waste, reduce production costs, and improve shearing efficiency. The method of the present invention is particularly suitable for avoiding cross contamination of shearing of aluminum or aluminum-scandium alloy and other materials.

Description

Technical Field

[0001] The invention relates to the technical field of target material processing, and in particular to a method for avoiding shear cross contamination of aluminum-scandium materials. Background Art

[0002] The preparation of aluminum-scandium targets is mainly divided into two technical routes: smelting and casting method and powder metallurgy method. Among them, the smelting and casting method mostly uses magnetic levitation smelting of aluminum-scandium. This method can quickly induction heat the material and obtain a clean and high-purity product. However, there is a disadvantage of the smelting and casting method, that is, the part close to the water-cooled wall is easy to fall into the melt during the casting process, resulting in uneven melt. In order to avoid waste of materials, the cast target blank needs to be returned to the furnace for recasting. The target blank needs to be returned to the furnace for recasting. Crushing tools are needed to cut it into a certain size for easy insertion into the smelting crucible. The most commonly used crushing tool in production is the shearing machine, which can cut materials of appropriate size according to our needs, especially for the irregular morphology of the bottom part of the cold crucible during casting. The crushing is very effective and will not cause material oxidation problems. However, in the actual production process, shearing machines are often used cross-wise, that is, the same shearing machine shears and crushes multiple materials, which inevitably leads to cross-contamination between materials.

[0003] Aluminum-scandium targets are mainly used in the fields of MEMS and 5G filters, which have extremely high requirements for the purity of product impurities. Once contamination occurs, it will cause waste of target blanks, leading to increased production costs. At present, the common methods to avoid shear contamination are to divide the area for zoning treatment or replace the cutting blade. However, both methods have their limitations and are not conducive to improving shearing efficiency. Therefore, the present invention provides a method for avoiding cross-contamination of aluminum-scandium materials during shearing. Summary of the invention

[0004] The primary purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a method for avoiding cross contamination of aluminum-scandium materials during shearing.

[0005] The object of the present invention is achieved by the following technical solution: A method for avoiding cross contamination of material shearing, comprising the following steps:

[0006] 1. Remove the material residue on the cutting edge of the shearing machine;

[0007] 2. Use 100-150 mesh sandpaper to polish the cutting edge to eliminate surface pits;

[0008] 3. Use 300-350 grit sandpaper to polish the cutting edge to eliminate scratches;

[0009] 4. Blow the cutting edge until there is no dust on its surface, and wipe it with dust-free paper until the cutting edge surface is clean and bright;

[0010] 5. Precision grinding cutting edge;

[0011] 6. Repeat step 4;

[0012] 7. Use the material to be sheared to shear and wash the knife in the shearing area for more than 4 times.

[0013] As a preferred solution, the material to be sheared is aluminum scandium.

[0014] As a preferred solution, step 1 is implemented using a stainless steel scraper and a scraping and cutting blade.

[0015] As a preferred solution, the polished cutting edge in steps 2 and 3 is the polished cutting edge's upper and lower surfaces and the front three surfaces.

[0016] As a preferred solution, the polishing of the cutting edge in steps 2 and 3 is performed by using a pneumatic polishing tool equipped with sandpaper to polish the cutting edge.

[0017] As a preferred solution, the cutting edge is purged in step 4 using an air gun with compressed air at 0.2-0.3 MPa.

[0018] As a preferred solution, the fine grinding of the cutting edge in step 5 is performed by using an electric grinder with a felt polishing wheel to fine grind the upper and lower surfaces and the front three surfaces of the cutting edge for 10-15 minutes each. The electric grinder has a power of 4-10kW, a rotation speed of 25000-27000r / min, and a 100-800 mesh felt polishing wheel is used for grinding.

[0019] As a preferred solution, the purity of the material to be sheared in step 7 is above 3.5N.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a method for avoiding cross contamination of materials during shearing. Before using the shearing machine, most of the materials in the shearing area of ​​the cutting blade are first removed, and then the materials are further removed by fine processing. Finally, the materials to be sheared or materials containing the same components as the materials to be sheared are used to wash the blades, thereby avoiding cross contamination caused by mixed shearing of different materials to the greatest extent, reducing material waste, reducing production costs, and improving shearing efficiency. The method of the present invention is particularly suitable for avoiding cross contamination of shearing of aluminum or aluminum-scandium alloy with other materials. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] 1. Use a stainless steel scraper to scrape the surface of the cutting edge to remove the material residues that the shearing machine cutting edge scrapes during the up and down reciprocating motion;

[0025] 2. Use a pneumatic grinding tool with 120-grit sandpaper to polish the upper and lower surfaces and the front three surfaces of the cutting edge to eliminate surface pits;

[0026] 3. Use a pneumatic grinding tool with 320-grit sandpaper to polish the upper and lower surfaces and the front three surfaces of the cutting edge to eliminate scratches;

[0027] 4. Use an air gun to blow the cutting edge with compressed air at 0.2MPa; wipe with dust-free paper until the cutting edge surface is clean and bright;

[0028] 5. Use an electric grinder with a felt polishing wheel to finely grind the upper and lower surfaces and the front three sides of the cutting edge for 10-15 minutes each; the electric grinder is 5kW, the speed is 25000r / min, and a 500-mesh felt polishing wheel is used for grinding;

[0029] 6. Repeat step 4;

[0030] 7. Use the material to be sheared to shear and wash the knife in the shearing area;

[0031] 8. Repeat step 7 5 times to ensure the polishing effect.

[0032] Comparative Example 1

[0033] 1. Use an electric grinder equipped with 120-grit sandpaper and a louvered grinding disc to grind the upper and lower surfaces and the front three sides of the cutting blade to eliminate scratches and pits.

[0034] 2. Use an electric grinder to grind the upper and lower surfaces and the front three surfaces of the cutting edge for 10-15 minutes each; the electric grinder has a power of 5kW and a speed of 25000r / min, and uses a 500-mesh felt polishing wheel for grinding;

[0035] 3. Wipe the cutting edge with dust-free paper until its surface is clean;

[0036] 4. Use the material to be sheared to shear and wash the knife 5 times in the shearing area.

[0037] Comparative Example 2

[0038] 1. Use 80-grit sandpaper to polish the cutting edge surface to remove the material residues that the shearing machine cutting edge scrapes during the up and down reciprocating motion;

[0039] 2. Use 120-grit sandpaper to manually polish the upper and lower surfaces and the front three sides of the cutting edge to eliminate surface pits;

[0040] 3. Use an electric grinder with 600-grit sandpaper to grind the upper and lower surfaces and the front three sides of the cutting edge for 10-15 minutes each; the electric grinder is 5kW and the speed is 25000r / min;

[0041] 4. Use an air gun to blow the cutting edge with compressed air at 0.2MPa; wipe the cutting edge with dust-free paper until its surface is clean;

[0042] 5. Use the material to be sheared to shear and wash the knife 5 times in the shearing area.

[0043] Comparative Example 3

[0044] 1. Use 80-grit sandpaper to polish the cutting edge surface to remove the material residues that the shearing machine cutting edge scrapes during the up and down reciprocating motion;

[0045] 2. Use a hand-polished brush with 120-grit sandpaper to manually polish the upper and lower surfaces and the front three sides of the cutting edge to eliminate surface pits;

[0046] 3. Use 320-grit sandpaper to manually polish the upper and lower surfaces and the front three sides of the cutting edge to eliminate scratches;

[0047] 4. Use an air gun to blow the cutting edge with compressed air at 0.2MPa; wipe the cutting edge with dust-free paper until its surface is clean;

[0048] 5. Use the material to be sheared to shear and wash the knife 5 times in the shearing area.

[0049] Comparative Example 4

[0050] 1. Use a stainless steel scraper to scrape the surface of the cutting blade to remove the material residues that the shearing machine cutting blade scrapes during the up and down reciprocating motion;

[0051] 2. Use 120-grit sandpaper to manually polish the upper and lower surfaces and the front three sides of the cutting edge to eliminate the pits on it;

[0052] 3. Use an electric grinder with 800-grit sandpaper to finely grind the upper and lower surfaces and the front three sides of the cutting edge for 10-15 minutes each; the electric grinder is 5kW and has a speed of 25,000 r / min;

[0053] 4. Blow with an air gun, compressed air 0.2MPa; wipe the cutting edge with dust-free paper until its surface is clean;

[0054] 6. Use the material to be sheared to shear and wash the knife 5 times in the shearing area.

[0055] The residual materials on the cutting blade of the materials listed in Table 1 were processed, and the cutting blade of the above residual materials was processed by the methods of the embodiment and the comparative embodiment respectively, and the treated materials were put into the cutting blade for shearing 4N pure aluminum, and the sheared aluminum fragments were sampled and sent for inspection, and ICP-OES detection was carried out to obtain the data shown in Table 1.

[0056] Table 1 Material impurity detection results of each embodiment and comparative example

[0057]

[0058] According to the impurity detection data of Example 1 and Comparative Examples 1-4, the method of Example 1 can effectively avoid cross contamination of material shearing.

[0059] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for avoiding cross contamination of materials by shearing, characterized in that: The following steps are involved: 1) Remove the material residue on the cutting edge of the shearing machine; 2) Use 100-150 mesh sandpaper to polish the cutting edge to eliminate surface pits; 3) Use 300-350 mesh sandpaper to polish the cutting edge to eliminate scratches; 4) Blow the cutting edge until there is no dust on its surface, and wipe it with dust-free paper until the cutting edge surface is clean and bright; 5) Precision grinding cutting edge; 6) Repeat step 4; 7) Use the material to be sheared to shear and wash the knife in the shearing area for more than 4 times.

2. The method for avoiding cross contamination of materials by shearing according to claim 1, characterized in that: Step 1 is achieved using a stainless steel spatula with a scraping and cutting edge.

3. The method for avoiding cross contamination of materials by shearing according to claim 1, characterized in that: The polished cutting edge in steps 2 and 3 refers to the polished upper and lower surfaces and the front three surfaces of the cutting edge.

4. The method for avoiding cross contamination of materials by shearing according to claim 1, characterized in that: The polishing of the cutting edge in steps 2 and 3 is performed by using a pneumatic polishing tool equipped with sandpaper to polish the cutting edge.

5. The method for avoiding cross contamination of materials by shearing according to claim 1, characterized in that: In step 4, the cutting edge is purged using an air gun with compressed air at 0.2-0.3 MPa.

6. The method for avoiding cross contamination of materials by shearing according to claim 1, characterized in that: The fine grinding of the cutting edge described in step 5 is carried out by using an electric grinder with a felt polishing wheel to fine grind the upper and lower surfaces and the front three surfaces of the cutting edge for 10-15 minutes each. The electric grinder has a power of 4-10kW and a rotation speed of 25000-27000r / min, and a 100-800 mesh felt polishing wheel is used for grinding.

7. The method for avoiding cross contamination of materials by shearing according to claim 1, characterized in that: The purity of the material to be sheared in step 7 is above 3.5N.

8. The method for avoiding cross contamination of materials by shearing according to claim 1, characterized in that: The material to be sheared is aluminum scandium.

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