Manufacturing device of master alloy hollow rod for gas atomization powder preparation

Abstract

The utility model relates to the technical field of metal powder manufacturing, in particular to a manufacturing device of a master alloy hollow rod for gas atomization powder manufacturing, which comprises a metal outer die, a sandy inner die and a fixed base, a step-shaped counter bore with an upward opening is arranged in the center of the upper portion of the fixed base, and the metal outer die is sleeved in the counter bore. The depth of the counter bore is 1 / 2 of the diameter of the metal outer die; four threaded holes which are through from inside to outside are formed in the outer side of the counter bore in the circumferential direction, and a screw for fixing and adjusting the position of the metal outer mold is in threaded connection in each threaded hole; the device is simple in structure and convenient to use, metal needing to be atomized is melted and then cast into a master alloy hollow rod through a device composed of the metal outer mold, the sandy inner mold and the fixed base, the master alloy hollow rod with the corresponding length is cut out according to the height of a crucible, and then the master alloy hollow rod can be placed in the crucible. Therefore, the mother alloy bar does not need to be cut up or drilled in the center, the metal loss is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal powder manufacturing, in particular to a manufacturing device for a hollow master alloy rod used for gas atomization powder making. Background Art

[0002] Currently, one process in metal gas atomization powder production involves using a stopper rod as a valve to control the flow of molten metal from the bottom of the crucible. This process offers advantages such as a stable metal flow rate, reduced scum intrusion, and consistent particle size and high purity of the atomized metal powder. However, this process typically requires a cast master alloy rod. Due to the presence of a central stopper rod, the rod must be cut into pieces or drilled through the center to arrange the metal around the stopper rod. Cutting and drilling the master alloy rod results in significant metal loss, exceeding 20% ​​to 30%. Furthermore, some master alloys are extremely hard or cannot be drilled, requiring cutting and crushing. Furthermore, gaps exist within the crucible when the metal blocks are filled, resulting in low crucible space utilization. The usable weight of the master alloy is only 30% to 40% of the crucible's rated load capacity, resulting in very low production efficiency. Utility Model Content

[0003] The utility model provides a device for making hollow master alloy rods for aerosol powder production, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problems of large metal loss and low production efficiency in the current devices for chopping or center drilling master alloy rods.

[0004] In order to solve the above problems, the utility model describes a manufacturing device for hollow master alloy rods for aerosol powder making, comprising a metal outer mold, a sandy inner mold and a fixed base, a step-shaped countersunk hole with an opening upward is provided in the center of the upper part of the fixed base, the metal outer mold is installed in the countersunk hole, and the depth of the countersunk hole is equal to one half of the diameter of the metal outer mold; four threaded holes that pass through the outside of the countersunk hole are evenly distributed along the circumference, and each threaded hole is screwed with a screw for fixing and adjusting the position of the metal outer mold; the sandy inner mold comprises an iron rod, refractory quartz sand and refractory coating, an external thread is provided on the outside of the bottom of the iron rod, the outside of the iron rod above the external thread is wrapped with refractory quartz sand, and the outside of the refractory quartz sand is wrapped with refractory coating, a threaded blind hole with an opening upward and matching the external thread of the iron rod is provided in the center of the bottom of the countersunk hole, and the external thread of the iron rod at the bottom is screwed together with the threaded blind hole in the center of the bottom of the countersunk hole.

[0005] The above-mentioned metal outer mold is made of low-carbon steel with a thick wall thickness greater than or equal to 10 mm, and the inner wall of the metal outer mold is polished into a mirror surface.

[0006] The above-mentioned fixed base is made of T2 copper.

[0007] The sandy inner mold is made of refractory quartz sand.

[0008] Compared with the prior art, the present invention has the following advantages:

[0009] The utility model has a simple structure and is easy to use. After the metal to be atomized is melted, it is cast into a mother alloy hollow rod in a device composed of a metal outer mold, a sand inner mold and a fixed base. The mother alloy hollow rod can be placed in the crucible by cutting the corresponding length according to the height of the crucible. Therefore, there is no need to cut the mother alloy rod into pieces or drill a hole in the center, which reduces metal loss and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0011] Figure 1 This is a schematic diagram of the device structure of the present utility model.

[0012] In the figure: 1-metal outer mold, 2-sand inner mold, 3-fixed base. DETAILED DESCRIPTION

[0013] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0014] The present invention will be further described below in conjunction with the embodiments and accompanying drawings:

[0015] like Figure 1 As shown, a device for manufacturing hollow master alloy rods for aerosol powder making comprises a metal outer mold 1, a sandy inner mold 2 and a fixed base 3. A stepped countersunk hole with an opening upward is provided in the center of the upper portion of the fixed base 3. The metal outer mold 1 is mounted in the countersunk hole, and the depth of the countersunk hole is equal to half the diameter of the metal outer mold 1. Four threaded holes that pass through the countersunk hole are evenly distributed along the circumference on the outside of the countersunk hole, and a screw for fixing and adjusting the position of the metal outer mold is screwed into each threaded hole. The sandy inner mold 2 comprises an iron rod, refractory quartz sand and refractory coating. An external thread is provided on the outside of the bottom of the iron rod, and the outside of the iron rod above the external thread is wrapped with refractory quartz sand, and the outside of the refractory quartz sand is wrapped with refractory coating. A threaded blind hole with an opening upward and matching the external thread of the iron rod is provided in the center of the bottom of the countersunk hole, and the external thread of the iron rod is screwed together with the threaded blind hole in the center of the bottom of the countersunk hole.

[0016] Among them, refractory quartz sand needs to be mixed with adhesive when shaping to improve the bonding between refractory quartz sand and iron rod.

[0017] Among them, four threaded holes that penetrate inside and outside are provided on the outside of the countersunk hole. Bolts are screwed into the threaded holes so that the bolts fix the metal outer mold 1 on the inside of the countersunk hole, which facilitates the fixation and position adjustment of the metal outer mold 1.

[0018] As needed, the outer metal mold 1 is made of mild steel with a thick wall thickness of 10 mm or greater, and its inner wall is polished to a mirror finish. The inner diameter of the outer metal mold 1 is generally 80% of the crucible's inner diameter. The inner diameter of the countersunk hole is 5 mm larger than the outer diameter of the outer metal mold 1, making it easier to place the outer metal mold 1 within the countersunk hole.

[0019] As needed, the fixed base 3 is made of T2 copper.

[0020] As required, sandy inner mold 2 adopts refractory quartz sand to make.As required, the diameter of iron rod equals 1 / 3rd of sandy inner mold 2 diameters.

[0021] The utility model is used by assembling a metal outer mold 1, a sandy inner mold 2 and a fixed base 3 together, and placing the assembled device in a metal melting furnace casting position, so that an annular cavity is formed between the metal outer mold 1 and the sandy inner mold 2. During casting, the metal solution will fill the cavity formed by the sandy inner mold 2 and the metal outer mold 1. After the metal solution is cast and cooled, due to thermal expansion and contraction, a gap will be formed between the solidified metal and the metal outer mold 1 and separated. Therefore, the metal outer mold 1 can be removed from the top of the fixed base 3, and then the solidified metal casting and the sandy inner mold 2 are rotated to separate the sandy inner mold 2 from the fixed base 3. Finally, the refractory quartz sand on the surface of the iron rod is shattered by knocking the iron rod in the center of the inner mold and then removed. In this way, a metal round rod casting with a hole in the middle is obtained, which is called a mother alloy hollow rod. After the mother alloy hollow rod is made, according to the height of the gas atomization melting crucible, the hollow rod is placed in the center of the crucible in its entirety or cut into an appropriate length, and then a stopper rod is inserted into the hollow rod to complete the metal filling and charging. As a result, the metal loading rate of the gas atomization powder making crucible can be increased to more than 80%, greatly improving production efficiency. At the same time, metal loss caused by metal cutting or drilling is avoided, and the metal utilization rate can reach more than 90%.

[0022] In summary, the utility model has a simple structure and is easy to use. The metal to be atomized is melted and then cast into a mother alloy hollow rod in a device consisting of a metal outer mold 1, a sandy inner mold 2 and a fixed base 3. The corresponding length of the mother alloy hollow rod is cut according to the height of the crucible and the rod can be placed in the crucible. Therefore, there is no need to cut the mother alloy rod into pieces or drill a hole in the center, which reduces metal loss and improves production efficiency.

Claims

1. A device for producing hollow master alloy rods for gas atomization powder production, characterized in that: It includes a metal outer mold, a sandy inner mold and a fixed base. A stepped countersunk hole with an opening upward is provided in the center of the upper part of the fixed base. The metal outer mold is installed in the countersunk hole, and the depth of the countersunk hole is equal to half of the diameter of the metal outer mold; four threaded holes that pass through the outside of the countersunk hole are evenly distributed along the circumference, and each threaded hole is screwed with a screw for fixing and adjusting the position of the metal outer mold; the sandy inner mold includes an iron rod, refractory quartz sand and refractory coating. An external thread is provided on the outside of the bottom of the iron rod, and the outside of the iron rod above the external thread is wrapped with refractory quartz sand, and the outside of the refractory quartz sand is wrapped with refractory coating. A threaded blind hole with an opening upward and matching the external thread of the iron rod is provided in the center of the bottom of the countersunk hole. The external thread of the bottom of the iron rod is screwed together with the threaded blind hole in the center of the bottom of the countersunk hole.

2. The device for producing hollow master alloy rods for gas atomization powder production according to claim 1, characterized in that: The metal outer mold is made of low-carbon steel with a thick wall thickness greater than or equal to 10 mm, and the inner wall of the metal outer mold is ground into a mirror surface.

3. A device for producing hollow master alloy rods for gas atomization powder production according to claim 1 or 2, characterized in that: The fixed base is made of T2 copper.

4. A device for producing hollow master alloy rods for gas atomization powder production according to claim 1 or 2, characterized in that: The sand inner mold is made of refractory quartz sand.

5. The device for producing hollow master alloy rods for gas atomization powder production according to claim 3, characterized in that: The sand inner mold is made of refractory quartz sand.

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