Preparation method of metal particles and clamp

Abstract

The invention discloses a preparation method of metal particles and a clamp, and the preparation method of the metal particles comprises the following steps: respectively processing two ends of a metal piece to cut a plurality of metal particles; preparing a clamp with a vice jaw, wherein the size of the vice jaw is 0.5 mm larger than that of the metal particles; and the metal particles are placed on a vice jaw of the clamp and clamped, the top faces of the metal particles are subjected to face milling and finish machining so that the metal particles can be machined to the preset size, and 0.005 mm allowance needs to be reserved before finish machining of the top faces. Required particles are cut from the metal piece, unnecessary complex procedures and possible impurity introduction are avoided, meanwhile, the requirement for an acid pickling step harmful to the environment is reduced, a special clamp and a machining technology are used, the quality and appearance glossiness of the metal particles are improved, efficient continuous production is achieved, and the production cost is reduced. The problems of low efficiency, high cost and the like in a traditional preparation method are solved.

Description

Technical Field

[0001] The invention relates to the field of metal technology, and in particular to a method for preparing metal particles and a clamp. Background Art

[0002] In the evaporation coating process of the electronics industry, high-purity aluminum wire is currently a widely used material. In the traditional process, the high-purity aluminum wire needs to be cut first and then placed in the evaporation boat for evaporation coating. However, this process not only adds an additional cutting process and increases production costs, but also increases the possibility of secondary pollution. In addition, the oil and oxide film on the surface of the high-purity aluminum wire have a certain negative impact on the quality of the evaporation coating. Relatively speaking, casting high-purity aluminum particles has the advantages of simpler production process and cleaner surface, which makes it advantageous in the competition. There are two main methods for preparing high-purity aluminum particles: one is cutting aluminum particles, which includes three steps: wire drawing and die matching, shot cutting or sawing, and screening and packaging. Although this method can produce aluminum particles of uniform size and adjustable specifications according to needs, the cost is increased due to the large number of processes, and impurities are easily introduced during the shearing process, affecting the quality of the final aluminum particles. The other is the molten aluminum drop casting method, which adjusts the temperature in the melting furnace and controls the flow of molten aluminum so that the aluminum liquid passes through the aluminum storage crucible, is pressurized by a power device, and drips onto the running cooling conveyor belt through the dripping hole to solidify and form. Although this method can produce spherical aluminum particles, the equipment is complex and it is difficult to ensure long-term continuous production. As the production time increases, the long-term contact between the mold and the aluminum liquid will cause aluminum liquid contamination, resulting in aluminum particles of different sizes and difficulty in molding. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the existing metal particle preparation process is complicated and the particle appearance glossiness is poor, and the prepared metal particles need to undergo a complicated pickling process, resulting in low efficiency.

[0004] In order to solve the above technical problems, the present invention provides a method for preparing metal particles, comprising the following steps:

[0005] Processing the two ends of the metal part respectively to cut out a number of metal particles;

[0006] Preparing a fixture with a vise jaw, wherein the size of the vise jaw is 0.5 mm larger than the metal particles;

[0007] The metal particles are placed in the vise of the fixture and clamped, and the top surface of the metal particles is milled and finished to a preset size. A 0.005 mm margin needs to be retained before finishing the top surface.

[0008] Furthermore, the metal part is made of a first metal material or a second metal material, and the plasticity of the second metal material is lower than that of the first metal material.

[0009] Furthermore, processing is performed on both ends of the metal piece made of the first metal material to cut out a plurality of metal particles, including:

[0010] The top surface of one end of the metal part is milled and finely processed, and then one end of the metal part is cut to cut out a plurality of metal particles, and a 0.005 mm margin needs to be reserved before fine processing of the top surface;

[0011] The other end of the metal part is milled and finished, and then the other end of the metal part is cut to cut out a number of metal particles. A 0.005mm margin needs to be reserved before the top surface is finished.

[0012] Furthermore, processing is performed on both ends of the metal piece made of the second metal material to cut out a plurality of metal particles, including:

[0013] Pouring the metal into the mold by vacuum melting to form a metal ingot, the height of which is at least 2 mm greater than the height of the metal particles to be processed;

[0014] Grinding the upper and lower surfaces of the metal ingot with a grinding machine to a precision within ±0.5 mm;

[0015] The ground metal ingot is cut into a plurality of cylindrical metal particles by wire cutting, and the bottom diameter of the metal particles is 0.5 mm larger than the preset required diameter.

[0016] Furthermore, the milling of both ends of the metal part and the milling of the metal particles both include: the last cutter of the milling operation performs milling at a rotation speed of S4500-6000.

[0017] Furthermore, after milling the two ends of the metal part and the metal particles, the method further includes: chamfering and deburring with an R-angle cutter.

[0018] Further, the metal particles are placed in the vise of the fixture and clamped, and the top surface of the metal particles is milled and fine-processed to a preset size, including:

[0019] If the metal particles are made of the first metal material, the metal particles are placed in the vise of the fixture and clamped, and the top surface of the unmilled end of the metal particles is milled and fine-machined to a preset size;

[0020] If the metal particles are made of the second metal material, the metal particles are placed in the vise of the fixture and clamped, and the top surfaces of both ends of the metal particles are milled and finely processed to a preset size.

[0021] The present invention also provides a clamp, which is used for the above-mentioned method for preparing metal particles, including a bracket, a lifting block, a lifting rod, a driving member and a clamping structure, the clamping structure including a first clamping block and a second clamping block, the first clamping block is installed on the bracket, one side of the second clamping block is connected to the lifting rod through the lifting block, one end of the lifting rod away from the lifting block is connected to the driving member, and the second clamping block is slidably connected to the bracket, the first clamping block has a first clamping opening, the second clamping block has a second clamping opening, and the first clamping opening and the second clamping opening are enclosed to form a vise opening.

[0022] Further, the area of ​​the first clamping opening is 75% of the area of ​​the vise opening, and the area of ​​the second clamping opening is 25% of the area of ​​the vise opening.

[0023] Further, the hardness of the first clamping block is greater than the hardness of the second clamping block.

[0024] Compared with the prior art, the method and fixture for preparing metal particles according to the embodiment of the present invention have the following beneficial effects:

[0025] The embodiment of the present invention optimizes the production process flow to cut the required particles from the metal parts, thereby avoiding unnecessary complex processes and possible introduction of impurities, while also reducing the need for environmentally harmful pickling steps, and using special fixtures and processing techniques, which not only improves the quality and appearance gloss of the metal particles, but also achieves efficient continuous production, solving the problems of low efficiency and high cost in traditional preparation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a front view of the working state of the clamping metal piece provided by an embodiment of the present invention;

[0027] Figure 2 is an axial view of the working state of the clamping metal piece provided by an embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of the structure of a clamp provided by an embodiment of the present invention;

[0029] Figure 4 The embodiment of the present invention provides Figure 3 A partial enlarged view of the circled portion A;

[0030] In the figure, 1, metal part; 2, clamp; 21, bracket; 22, lifting block; 23, lifting rod; 24, driving member; 25, clamping structure; 251, first clamping block; 2511, first clamping port; 252, second clamping block; 2521, second clamping port. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] like Figure 1 and Figure 2 As shown, a method for preparing metal particles comprises the following steps:

[0033] Processing the two ends of the metal piece 1 respectively to cut out a plurality of metal particles;

[0034] This step can avoid additional cutting process, reduce production cost and reduce the possibility of secondary pollution by cutting metal particles from the metal part 1. In addition, direct cutting helps to maintain the purity of metal particles because the chance of contact with external tools or environment is reduced.

[0035] Prepare a fixture 2 with a vise jaw, wherein the size of the vise jaw is 0.5 mm larger than the metal particles;

[0036] The vise opening of the clamp 2 in this step (i.e. the part used to fix the workpiece) is slightly larger than the metal particles to be processed (specifically 0.5mm) so as to firmly clamp the metal particles without causing damage, ensuring that the metal particles can be stably and safely fixed during subsequent processing.

[0037] The metal particles are placed in the vise of the fixture 2 and clamped, and the top surface of the metal particles is milled and finished to a preset size. A 0.005 mm margin needs to be retained before finishing the top surface.

[0038] This step not only removes surface defects such as oil or oxide film by milling and finishing the top surface of the metal particles, but also ensures that the metal particles meet high-precision dimensional requirements, thereby improving the gloss and quality of the product appearance. In addition, the reserved tiny margin helps to achieve the final precision adjustment to ensure dimensional accuracy.

[0039] This embodiment optimizes the production process to cut the required particles from the metal part 1, avoiding unnecessary complex processes and possible introduction of impurities, while also reducing the need for environmentally harmful pickling steps. The use of a special fixture 2 and processing technology not only improves the quality and glossiness of the metal particles, but also achieves efficient continuous production, solving the problems of low efficiency and high cost in traditional preparation methods.

[0040] Furthermore, the metal component 1 is made of a first metal material or a second metal material, and the plasticity of the second metal material is lower than that of the first metal material.

[0041] In this embodiment, a suitable metal material can be selected as needed, wherein the first metal material is preferably aluminum, titanium or copper; and the second metal material is scandium.

[0042] Furthermore, the two ends of the metal member 1 made of the first metal material are processed respectively to cut out a plurality of metal particles including:

[0043] The top surface of one end of the metal part 1 is milled and finely processed, and then one end of the metal part 1 is cut to cut out a plurality of metal particles. A 0.005 mm margin needs to be reserved before fine processing of the top surface;

[0044] In this step, the top surface of one end is first milled and then fine-machined. Before the final fine-machining, a 0.005mm allowance is deliberately left to achieve extremely precise dimensional control in the final stage. After the fine-machining is completed, this end is cut to generate a predetermined number and size of metal particles.

[0045] The other end of the metal part 1 is milled and finished, and then the other end of the metal part 1 is cut to cut out a number of metal particles. A 0.005 mm margin needs to be reserved before the top surface is finished.

[0046] In this step, the above process is repeated for the other end of the metal part 1: milling and finishing (also leaving a margin of 0.005 mm), followed by cutting operations to produce more metal particles that meet the specification requirements.

[0047] This embodiment can effectively remove surface defects and ensure the quality and consistency of metal particles through milling and finishing steps. In addition, this embodiment retains a small amount of margin (0.005mm) before finishing, and can achieve a higher milling accuracy during final processing to minimize product scrapping due to inaccurate dimensions or surface quality problems, thereby improving overall production efficiency.

[0048] Furthermore, the two ends of the metal member 1 made of the second metal material are processed respectively to cut out a plurality of metal particles including:

[0049] The metal is poured into the mold by vacuum melting to form a metal ingot, the height of which is at least 2 mm greater than the height of the metal particles to be processed;

[0050] The vacuum melting in this step can reduce impurities and gas inclusions in the metal and improve the purity of the metal to ensure the quality of subsequent processing. In addition, the extra height provides sufficient margin for subsequent processing, ensuring that the required precise size can be achieved during the finishing process.

[0051] Use a grinder to grind the upper and lower surfaces of the metal ingot to a precision of ±0.5mm;

[0052] This step is to eliminate any irregularities or defects that may exist on the surface of the ingot, ensuring that its surface is smooth and flat, which helps to ensure the accuracy and consistency of the subsequent wire cutting process, thereby affecting the quality of the final product.

[0053] The ground metal ingot is cut into a plurality of cylindrical metal particles by wire cutting, and the bottom diameter of the metal particles is 0.5 mm larger than the preset required diameter.

[0054] This step allows for finer adjustments in the subsequent finishing steps by retaining a certain diameter allowance (i.e. 0.5 mm larger than the preset diameter), ensuring that the final product achieves extremely high dimensional accuracy and allowing for correction of machining errors.

[0055] Based on the above structure, this method overcomes the problems that the second metal material (low plasticity) may encounter during processing, such as easy breakage and difficulty in deformation. By adopting vacuum melting, grinder fine grinding and flatness control, and wire cutting processes, the quality and dimensional accuracy of metal particles can be effectively improved. In addition, reserving appropriate processing allowances allows for fine-tuning in the final finishing stage to ensure that each metal particle meets strict design standards. This processing method not only improves production efficiency and reduces scrap rate, but also optimizes the entire production process and reduces costs.

[0056] Furthermore, the milling of both ends of the metal part 1 and the milling of the metal particles both include: the last cutter of the milling operation performs milling at a rotation speed of S4500-6000.

[0057] This embodiment can reduce the contact time between the tool and the material surface through high-speed rotation, reduce the impact of cutting heat and vibration, thereby reducing processing marks and making the surface smoother. Before the final finishing, 0.005mm of material is deliberately reserved as a margin to ensure that any slight surface defects or processing marks (such as vibration marks) can be removed in the final fine processing, while achieving the best surface finish. This embodiment can achieve higher precision and flatness in the final processing and ensure surface brightness by reserving this tiny margin.

[0058] It should be noted that the tool in this embodiment is completely larger than the particle diameter in order to remove the streak marks of the milling cutter (because the disadvantage of milling with a milling cutter is that there will be streak marks, so a tool larger than the particle diameter should be used to cut through the top surface). This can avoid the streak marks caused by repeated cutting due to the small size of the tool. The one-time coverage of the large-diameter tool can provide a more uniform and consistent surface quality, reducing the visual inconsistency or surface defects caused by multiple cutting superpositions, thereby improving the overall processing quality and aesthetics.

[0059] Furthermore, the milling of the two ends of the metal part 1 and the milling of the metal particles both include: chamfering and deburring with an R-angle cutter.

[0060] Understandably, the edge of the untreated metal part 1 may be very sharp, posing a safety hazard and easily causing cuts or scratches. In this embodiment, the edge can be rounded and smoothed by chamfering, reducing the potential risk of injury to the human body. In addition, the chamfering can not only eliminate sharp edges, but also add a sense of refinement and professionalism to the product, making the appearance more neat and beautiful, and ensuring that the parts are easier to install in place without scratching or jamming adjacent parts.

[0061] Further, the metal particles are placed in the vise of the fixture 2 and clamped, and the top surface of the metal particles is milled and finely processed to a preset size including:

[0062] If the metal particles are made of the first metal material, the metal particles are placed in the vise of the fixture 2 and clamped, and the top surface of the unmilled end of the metal particles is milled and fine-machined to a preset size;

[0063] In this step, the metal particles are fixed in a special fixture 2 to provide a stable processing platform to prevent displacement during the milling process and ensure that they are stable and immobile, thereby ensuring processing accuracy. Since the first metal material has high plasticity, the top surface of one end of the metal particle that has not been processed is milled and finished until it reaches the design size, so as to reduce unnecessary processing steps, improve production efficiency, and reduce production costs.

[0064] If the metal particles are made of the second metal material, the metal particles are placed in the vise of the fixture 2 and clamped, and the top surfaces of both ends of the metal particles are milled and finely processed to a preset size.

[0065] In this step, the metal particles are first fixed in the fixture 2 to ensure stability during the processing and guarantee processing accuracy. In addition, since the metal part 1 was not milled in the previous processing, the top surfaces at both ends of the metal particles need to be milled and finished respectively until each end surface reaches the preset size standard to remove surface defects and ensure that the product meets strict quality requirements.

[0066] This implementation takes into account the physical properties of two different metal materials (such as plasticity differences) and adjusts the processing strategy in a targeted manner, which not only ensures product quality but also optimizes the production process. By controlling the processing process, whether it is single-end or double-end processing, it can ensure the dimensional accuracy and surface finish of the final product and improve the overall product quality. For the first metal material with better plasticity, a simpler single-end processing method can speed up production; and for the second metal material with poor plasticity, a more detailed double-end processing method is adopted. Such differentiated processing helps to balance the relationship between production efficiency and product quality.

[0067] like Figure 3 and Figure 4 As shown, the present invention also provides a clamp 2, which is applied to the above-mentioned method for preparing metal particles, including a bracket, a lifting block 21, a bracket; 22, a lifting rod 23, a driving member 24 and a clamping structure 25. The bracket serves as the basic supporting structure of the entire clamp 2, provides an installation position and stability for other components, and the bracket is used to be installed on the corresponding processing equipment. The clamping structure 25 includes a first clamping block 251 and a second clamping block 252. The first clamping block 251 is installed on the bracket, and the second clamping block 252 is slidably connected to the bracket. One side of the second clamping block 252 is connected to the lifting rod 23 through the lifting block 21, and the lifting rod 23 is away from the lifting block 21 is a bracket; one end of 22 is connected to the driving member 24, which is used to adjust the position of the second clamping block 252, so that the second clamping block 252 can move up and down under the action of the driving member 24, so as to adapt to metal particles of different sizes and ensure that they are firmly clamped. The first clamping block 251 has a first clamping opening 2511, and the second clamping block 252 has a second clamping opening 2521. The first clamping opening 2511 and the second clamping opening 2521 are combined to form a vise opening for firmly clamping metal particles. By adjusting the position of the second clamping block 252, it can flexibly adapt to particles of different sizes, ensuring that a close fit can be achieved every time to avoid displacement during processing.

[0068] This embodiment can ensure that the metal particles remain absolutely stable during the processing by controlling the positions of the various parts of the clamp 2, reducing the errors caused by vibration or displacement, thereby improving the dimensional accuracy and surface quality of the final product; in addition, the clamp 2 allows the processing of metal particles of different sizes, increasing the versatility and flexibility of the equipment, reducing the need for tool replacement, and improving production efficiency. The vise jaw size of this embodiment is 0.5 mm larger than the size of the processed particles.

[0069] Furthermore, the area of ​​the first clamping opening 2511 is 75% of the area of ​​the vise opening. Since it occupies most of the clamping area, it provides the main support force and positioning function. The larger contact area helps to fix the metal particles more stably and reduce any displacement or vibration that may occur during the processing, thereby ensuring higher processing accuracy; the area of ​​the second clamping opening 2521 is 25% of the area of ​​the vise opening. By connecting the lifting block 21 bracket; 22 and the lifting rod 23, the second clamping opening 2521 can be flexibly moved and appropriate pressure can be applied to tighten the workpiece. Such a design enables the clamp 2 to adapt to metal particles of various specifications, increasing the versatility and flexibility of the equipment.

[0070] This embodiment ensures effective distribution of clamping force by setting the area ratio of 75% to 25%. The larger first clamping opening 2511 is responsible for providing stable support, while the smaller but adjustable second clamping opening 2521 is used to accurately adjust the clamping force to ensure that each metal particle can be clamped firmly and evenly, avoiding deformation or surface damage of the workpiece due to excessive local pressure.

[0071] Furthermore, the hardness of the first clamping block 251 is greater than the hardness of the second clamping block 252. Since the first clamping opening 2511 occupies the main part of the vise opening (75% area) and bears the main support and positioning functions, it will be subjected to greater pressure and friction during the metal processing process. The higher hardness can significantly improve its wear resistance, extend its service life, and maintain stability and precision for long-term use. In practical applications, the second clamping block 252 helps to avoid damaging the surface of the clamped metal particles. When the clamping force is applied to the metal particles, the softer second clamping block 252 can be slightly deformed to form a better fit with the workpiece, reducing the risk of scratches or indentations on the workpiece surface, and is particularly suitable for application scenarios that require maintaining a high surface finish.

[0072] It should be noted that when processing the fixture 2, the middle part of the first clamping block 251 and the second clamping block 252 clamps a 0.5 mm iron sheet. After processing, the bottom surface height of the softest material needs to be lower than the other side. The vise mouth is opened to continue processing the soft material vise mouth, so that the bottom surface of the workpiece is completely attached to the vise mouth of the metal surface, and finally the fixture 2 that fully covers the round hole is completed.

[0073] Preferably, the first clamping block 251 is made of aluminum or copper, and the second clamping block 252 is made of nylon, Teflon, or plastic steel.

[0074] Embodiment 1

[0075] Step 1: If Figure 1 and Figure 2 As shown in the figure, a 60mm diameter aluminum rod is placed on the chuck of the machining center to fix one end, and 9 metal particles are processed on the other end as one version (Note during processing: the tool is completely larger than the particle diameter, and a 0.005mm margin needs to be reserved before the top surface is finished, and the final high speed cut is made);

[0076] Step 2: Place the metal particles processed in the first step and the unprocessed end in the wire cutting fixture 2, set the cutting size and cut to obtain 9 metal particles (note that the height does not need to be particularly accurate, ensure that the workpiece height is larger than the drawing size, and the wire cutting does not touch it when it falls);

[0077] Step 3: Prepare the fixture 2 of the machining center. Note: The machining center vise is clamped (Note: The vise jaw size of the fixture 2 is 0.5 mm larger than the size of the processed particles.

[0078] Step 4: Place the wire-cut metal particles in the fixture 2 of the machining center, confirm that they are clamped and there are no hidden dangers before starting processing, and process the surface of the metal particles to the target (the milling surface is the same as the first surface processing. Before finishing the top surface, a 0.005mm margin needs to be retained and finally a high-speed pass is made. Finally, the R-angle knife gently chamfers and removes burrs.) Finally, aluminum particles with a size of D6*10mm are obtained, the particle surface has good gloss, and the appearance is neat and beautiful.

[0079] Embodiment 2

[0080] Step 1: Place a 60mm diameter copper rod on the chuck of the machining center to fix one end, and process 9 metal particles on the other end as one plate (Note during processing: the tool is completely larger than the particle diameter, and a 0.005mm margin needs to be reserved before finishing the top surface, and then the tool is cut at a high speed).

[0081] Step 2: Place the metal particles processed in the first step and the unprocessed end in the wire cutting fixture 2, set the cutting size and cut to obtain 9 metal particles (note that the height does not need to be particularly accurate, ensure that the workpiece height is larger than the drawing size, and the wire cutting does not touch it when it falls);

[0082] Step 3: Prepare the fixture 2 of the machining center.

[0083] Step 4: Place the wire-cut metal particles in the vise of the machining center, confirm that they are clamped and there are no hidden dangers before starting processing, and process the surface of the metal particles to the target (the milling surface is the same as the first surface processing. Before finishing the top surface, a 0.005mm margin needs to be retained and finally a high-speed pass is made. Finally, the R angle knife is used to gently chamfer and remove burrs.) Finally, copper particles with a size of D6*10mm are obtained. The particle surface has good gloss and a neat and beautiful appearance. Unlike aluminum particles, the copper particles are first packaged in a vacuum bag after processing; then the desiccant and the packaged copper particles are placed together and then packaged in a vacuum bag to prevent oxidation of the copper particles.

[0084] Embodiment 3

[0085] Step 1: Place a 60mm diameter titanium rod on the chuck of the machining center to fix one end, and process 9 metal particles on the other end as one version (Note during processing: the tool is completely larger than the particle diameter, and a 0.005mm margin needs to be reserved before finishing the top surface, and then the tool is cut at a high speed).

[0086] Step 2: Place the metal particles processed in the first step and the unprocessed end in the wire cutting fixture 2, set the cutting size at one end of the metal particles and cut them to obtain 9 metal particles (note that the height does not need to be particularly accurate, ensure that the workpiece height is larger than the drawing size, and do not hit it when the wire cutting falls);

[0087] Step 3: Prepare the fixture 2 of the machining center;

[0088] Step 4: Place the wire-cut metal particles in the vise of the machining center, confirm that they are clamped and there are no hidden dangers before starting processing, and process the surface of the metal particles to the target (the milling surface is the same as the first surface processing. Before finishing the top surface, a 0.005mm margin needs to be retained and finally a high-speed pass is made. Finally, the R-angle knife is used to gently chamfer and remove burrs.) Finally, titanium particles with a size of D6*10mm are obtained, the particle surface has good gloss, and the appearance is neat and beautiful.

[0089] In summary, the embodiment of the present invention provides a method for preparing metal particles and a fixture 2, which cuts the required particles from the metal part 1 by optimizing the production process, avoiding unnecessary complex steps and possible introduction of impurities, while also reducing the need for environmentally harmful pickling steps. The use of a special fixture 2 and processing technology not only improves the quality and glossiness of the metal particles, but also achieves efficient continuous production, solving the problems of low efficiency and high cost in traditional preparation methods.

[0090] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing metal particles, characterized in that: The steps include: Processing the two ends of the metal part respectively to cut out a number of metal particles; Preparing a fixture with a vise jaw, wherein the size of the vise jaw is 0.5 mm larger than the metal particles; The metal particles are placed in the vise of the fixture and clamped, and the top surface of the metal particles is milled and finished to a preset size. A 0.005 mm margin needs to be retained before finishing the top surface.

2. The method for preparing metal particles according to claim 1, characterized in that: The metal part is made of a first metal material or a second metal material, and the plasticity of the second metal material is lower than that of the first metal material.

3. The method for preparing metal particles according to claim 1, characterized in that: Processing the two ends of the metal piece made of the first metal material to cut out a plurality of metal particles includes: The top surface of one end of the metal part is milled and finely processed, and then one end of the metal part is cut to cut out a plurality of metal particles, and a 0.005 mm margin needs to be reserved before fine processing of the top surface; The other end of the metal part is milled and finished, and then the other end of the metal part is cut to cut out a number of metal particles. A 0.005mm margin needs to be reserved before the top surface is finished.

4. The method for preparing metal particles according to claim 2, characterized in that: The two ends of the metal piece made of the second metal material are processed respectively to cut out a plurality of metal particles including: Pouring the metal into the mold by vacuum melting to form a metal ingot, the height of which is at least 2 mm greater than the height of the metal particles to be processed; Grinding the upper and lower surfaces of the metal ingot with a grinding machine to a precision within ±0.5 mm; The ground metal ingot is cut into a plurality of cylindrical metal particles by wire cutting, and the bottom diameter of the metal particles is 0.5 mm larger than the preset required diameter.

5. The method for preparing metal particles according to claim 3 or 4, characterized in that: The milling of both ends of the metal part and the milling of the metal particles both include: the last cutter of the milling operation performs milling at a rotation speed of S4500-6000.

6. The method for preparing metal particles according to claim 3 or 4, characterized in that: The milling of the two ends of the metal part and the milling of the metal particles both include: chamfering and deburring with an R angle cutter.

7. The method for preparing metal particles according to claim 2, characterized in that: Placing the metal particles in the vise of the fixture and clamping them, milling and finishing the top surface of the metal particles to a preset size includes: If the metal particles are made of the first metal material, the metal particles are placed in the vise of the fixture and clamped, and the top surface of the unmilled end of the metal particles is milled and fine-machined to a preset size; If the metal particles are made of the second metal material, the metal particles are placed in the vise of the fixture and clamped, and the top surfaces of both ends of the metal particles are milled and finely processed to a preset size.

8. A fixture used in the method for preparing metal particles according to any one of claims 1 to 7, characterized in that: It includes a bracket, a lifting block, a lifting rod, a driving member and a clamping structure, wherein the clamping structure includes a first clamping block and a second clamping block, the first clamping block is installed on the bracket, one side of the second clamping block is connected to the lifting rod through the lifting block, one end of the lifting rod away from the lifting block is connected to the driving member, and the second clamping block is slidably connected to the bracket, the first clamping block has a first clamping opening, the second clamping block has a second clamping opening, and the first clamping opening and the second clamping opening are enclosed to form a vise opening.

9. The clamp according to claim 8, characterized in that The area of ​​the first clamping opening is 75% of the area of ​​the vise opening, and the area of ​​the second clamping opening is 25% of the area of ​​the vise opening.

10. The clamp according to claim 8, characterized in that The hardness of the first clamping block is greater than the hardness of the second clamping block.

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