A crucible outer sheath for vacuum atomization powder making and its usage method

Abstract

The present invention relates to the field of vacuum gas atomization powder making, and specifically to a crucible outer sheath for vacuum gas atomization powder making and its usage method. Tighten the upper flange one and the upper flange two with the upper bolts to clamp the upper part of the metal frame, and tighten the lower flange one and the lower flange two with the lower bolts to clamp the lower part of the metal frame; wind and seal the metal frame from the outside with high-temperature resistant cloth to ensure there are no gaps, thereby forming a crucible outer sheath with an inner cavity; place the crucible in the center of the inner cavity of the crucible outer sheath, fill magnesia sand or corundum sand between the crucible and the crucible outer sheath, and bake the crucible and the crucible outer sheath with a hot air blower for standby. The present invention uses the combination method of the crucible outer sheath and the crucible to replace the melting method of the outer large crucible covering the small crucible in traditional vacuum gas atomization powder making. The crucible basket can be reused, avoiding the disadvantage of the short service life of the outer large crucible, greatly improving the production efficiency and equipment utilization rate of vacuum gas atomization powder making, and reducing the usage cost.

Description

Technical Field

[0001] The present invention relates to the field of vacuum atomization powder making, and specifically to a crucible outer sheath for vacuum atomization powder making and its usage method. Background Art

[0002] During the process of vacuum atomization powder making, usually a larger crucible is sleeved outside the crucible for melting the powder ingot, and the space between the large crucible and the small crucible is filled with magnesia or corundum sand; the crucible repeatedly withstands high temperatures during the powder making process, and the inner surface of the outer large crucible is extremely prone to peeling, cracking and other phenomena. Therefore, the outer large crucible needs to be frequently replaced, increasing the cost of powder making.

[0003] Using a crucible outer sheath to replace the traditional outer large crucible can achieve almost infinite use without worrying about damage, reducing the usage cost. At present, the crucible outer sheath technology has been adopted in vacuum melting furnaces, but the vacuum atomization powder making equipment still adopts the traditional double-crucible form. Summary of the Invention

[0004] Aiming at the current melting method of using a small crucible sleeved with an outer large crucible in vacuum atomization powder making, the purpose of the present invention is to provide a crucible outer sheath for vacuum atomization powder making and its usage method, and adopt the method of placing a small crucible inside the crucible outer sheath for melting.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A crucible outer sheath for vacuum atomization powder making, which includes: upper flange one, upper flange two, metal frame, lower flange one, lower flange two, and the specific structure is as follows:

[0007] The metal frame is formed by welding vertical bars and notched rings. More than two notched rings are arranged coaxially up and down in the vertical direction, and more than two vertical bars are evenly arranged along the outer side of the notched rings. The upper end of each vertical bar is an upper bent end horizontally outward, and the lower end of each vertical bar is a lower bent end horizontally inward;

[0008] Upper flange one and upper flange two are arranged opposite to each other up and down. The wall surface of the central circular hole of upper flange two closely adheres to the outer side of the vertical bars at the upper part of the metal frame. The upper bent ends of the vertical bars are clamped between upper flange one and upper flange two, and upper flange one, the upper bent ends, and upper flange two are fixed by passing through upper bolts;

[0009] Lower flange one and lower flange two are arranged opposite to each other up and down. The outer wall surface of lower flange one closely adheres to the inner side of the vertical bars at the lower part of the metal frame. The lower bent ends of the vertical bars are clamped between lower flange one and lower flange two, and lower flange one, the lower bent ends, and lower flange two are fixed by passing through lower bolts.

[0010] The crucible outer sheath used in true air atomization powder making has the notches of the notch ring facing the same direction, and the notches are between two adjacent vertical bars.

[0011] For the crucible outer sheath used in true air atomization powder making, the width of the vertical bar and the notch ring is 15 - 40 mm, and the thickness is 1 - 3 mm.

[0012] For the crucible outer sheath used in true air atomization powder making, the thickness of the upper flange 1 and the upper flange 2 is 5 mm - 20 mm, and the diameters of the central circular holes of the upper flange 1 and the upper flange 2 are the same.

[0013] For the crucible outer sheath used in true air atomization powder making, lifting rings are symmetrically installed at the top of the upper flange 1.

[0014] For the crucible outer sheath used in true air atomization powder making, the diameter of the central circular hole of the lower flange 1 is smaller than that of the lower flange 2, and the central circular holes of the lower flange 1 and the lower flange 2 form a stepped hole structure with the same axis.

[0015] For the crucible outer sheath used in true air atomization powder making, the thickness of the lower flange 1 and the lower flange 2 is 5 mm - 20 mm, and the diameter of the central circular hole of the lower flange 1 is in the range of 20 mm - 100 mm according to the size of the crucible outer sheath.

[0016] For the crucible outer sheath used in true air atomization powder making, the outside of the metal frame is wrapped and sealed with high-temperature resistant cloth, and the high-temperature resistant cloth is wound 1 - 3 layers.

[0017] The using method of the crucible outer sheath used in true air atomization powder making includes the following steps:

[0018] (1) Tighten and clamp the upper part of the metal frame by screwing the upper flange 1 and the upper flange 2 with upper bolts, and tighten and clamp the lower part of the metal frame by screwing the lower flange 1 and the lower flange 2 with lower bolts; wrap and seal the metal frame from the outside with high-temperature resistant cloth to ensure there are no gaps, thus forming a crucible outer sheath with an inner cavity.

[0019] (2) Make the high-temperature resistant insulating paper into a cylindrical shape and place it in the crucible outer sheath and closely attach it to the inner side of the metal frame.

[0020] (3) Place the crucible in the center of the inner cavity of the crucible outer sheath, fill magnesia or corundum sand between the crucible and the high-temperature resistant insulating paper, and bake the crucible and the crucible outer sheath with a hot air blower for standby.

[0021] For the using method of the crucible outer sheath used in true air atomization powder making, when it is necessary to quickly replace the crucible in a high-temperature state, lift the crucible outer sheath and the crucible quickly from the vacuum furnace through the lifting ring for replacement.

[0022] The advantages and beneficial effects of the present invention are:

[0023] The present invention replaces the melting method of a large outer crucible covering a small crucible in traditional vacuum gas atomization powder making with the combination of an outer crucible sheath and a crucible. The outer crucible sheath can be reused, avoiding the disadvantage of the short service life of the outer large crucible, greatly improving the production efficiency and equipment utilization rate of vacuum gas atomization powder making, and reducing the use cost. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the outer crucible sheath; wherein, 1 - lifting ring, 2 - upper flange 1, 3 - upper flange 2, 4 - metal frame, 5 - lower flange 1, 6 - lower flange 2, 10 - upper bolts, 11 - lower bolts, 12 - vertical bars, 13 - notched ring, 14 - upper bent end, 15 - lower bent end.

[0025] Figure 2 It is a schematic structural diagram after the crucible is installed in the outer crucible sheath; wherein, 2 - upper flange 1, 3 - upper flange 2, 5 - lower flange 1, 6 - lower flange 2, 7 - high-temperature resistant cloth, 8 - crucible, 9 - magnesia or corundum sand, 10 - upper bolts, 11 - lower bolts, 12 - vertical bars, 13 - notched ring, 14 - upper bent end, 15 - lower bent end, 16 - high-temperature resistant insulating paper. Detailed Embodiments

[0026] In order to better illustrate the present invention, the following will be described in detail with reference to the drawings of the specification.

[0027] As Figure 1 - Figure 2 shown, the outer crucible sheath used in the vacuum gas atomization powder making of the present invention mainly includes: upper flange 1 (2), upper flange 2 (3), metal frame (4), lower flange 1 (5), lower flange 2 (6), etc. The specific structure is as follows:

[0028] The metal frame (4) is formed by welding the vertical bars (12) and the notched ring (13). More than two notched rings (13) are arranged coaxially up and down in the vertical direction, and more than two vertical bars (12) are evenly arranged along the outer side of the notched ring (13). The upper end of each vertical bar (12) is an upper bent end (14) horizontally outward, and the lower end of each vertical bar (12) is a lower bent end (15) horizontally inward; wherein, the width of the vertical bar (12) and the notched ring (13) is 15 - 40 mm, and the thickness is 1 - 3 mm. The notches of the notched rings (13) face the same direction and are between two adjacent vertical bars (12). The notches can prevent the outer induction heating coil from generating discharge and sparking with the metal frame (4).

[0029] The upper flange one 2 and the upper flange two 3 are arranged opposite to each other up and down. The inner wall of the central circular hole of the upper flange two 3 is closely attached to the outer side of the vertical bar 12 at the upper part of the metal frame. The upper bent end 14 of the vertical bar 12 is clamped between the upper flange one 2 and the upper flange two 3. The upper flange one 2, the upper bent end 14, and the upper flange two 3 are fixed by passing through and installing the upper bolt 10. Among them, the thickness of the upper flange one 2 and the upper flange two 3 is 5 mm to 20 mm, and the diameters of the central circular holes of the upper flange one 2 and the upper flange two 3 are the same. The suspension rings 1 are symmetrically installed at the top of the upper flange one 2, which is convenient for taking out the crucible outer sheath in a high-temperature state from the vacuum furnace.

[0030] The lower flange one 5 and the lower flange two 6 are arranged opposite to each other up and down. The outer side wall of the lower flange one 5 is closely attached to the inner side of the vertical bar 12 at the lower part of the metal frame. The lower bent end 15 of the vertical bar 12 is clamped between the lower flange one 5 and the lower flange two 6. The lower flange one 5, the lower bent end 15, and the lower flange two 6 are fixed by passing through and installing the lower bolt 11. Among them, the thickness of the lower flange one 5 and the lower flange two 6 is 5 mm to 20 mm, the diameter of the central circular hole of the lower flange one 5 is smaller than the diameter of the central circular hole of the lower flange two 6, and the diameter of the central circular hole of the lower flange one 5 is in the range of 20 mm to 100 mm according to the size of the crucible outer sheath. The central circular holes of the lower flange one 5 and the lower flange two 6 form a stepped hole structure with the same axis. The function of the stepped hole structure is that the arc-shaped end of the crucible can be stuck at the stepped hole structure, ensuring that the crucible 8 and the crucible outer sheath are coaxial. In addition, the outer side of the vertical bar 12 of the metal frame 4 is hermetically wound with high-temperature resistant cloth 7, and a cylindrical high-temperature resistant insulating paper 16 is surrounded inside the notch ring 13 of the metal frame 4. Magnesium sand or corundum sand 9 is filled between the crucible 8 and the high-temperature resistant insulating paper 16.

[0031] As Figure 1 - Figure 2 shown, the assembly process of the crucible outer sheath of the present invention is as follows:

[0032] First, the upper flange one 2 and the upper flange two 3 are tightened with the upper bolt 10 to clamp the upper part of the metal frame 4, and the lower flange one 5 and the lower flange two 6 are tightened with the lower bolt 11 to clamp the lower part of the metal frame 4.

[0033] Then, the metal frame 4 is wound and sealed from the outside with the high-temperature resistant cloth 7 to ensure that there is no gap, thereby forming an integral structure with an inner cavity.

[0034] Among them, the outer dimension of the crucible outer sheath is determined by the external coil and the internal crucible size. The materials of the upper flange one 2, the upper flange two 3, the lower flange one 5, and the lower flange two 6 are refractory materials, such as asbestos board, etc. The high-temperature resistant cloth 7 is wound 1 to 3 layers, which can be asbestos cloth or fiberglass cloth, etc.

[0035] As Figure 1 - Figure 2 shown, the usage method of the crucible outer sheath of the present invention is as follows:

[0036] First, make the high-temperature resistant insulating paper 16 into a cylindrical shape, place it in the crucible outer sheath and closely attach it to the inner side of the metal frame 4. Then, place the crucible 8 in the center of the inner cavity of the crucible outer sheath. Next, fill the magnesia or corundum sand 9 between the crucible 8 and the high-temperature resistant insulating paper 16. Finally, bake the crucible and the crucible outer sheath with a hot air blower and set aside for use.

[0037] When it is necessary to quickly replace the crucible 8 in a high-temperature state, the crucible outer sheath and the crucible 8 can be quickly lifted out of the vacuum furnace through the lifting ring 1 for replacement.

[0038] The results show that the present invention uses the combination of the crucible outer sheath and the crucible to replace the melting method of the outer large crucible covering the small crucible in the traditional vacuum gas atomization powder making. The crucible basket can be reused, avoiding the disadvantage of the short service life of the outer large crucible, greatly improving the production efficiency and equipment utilization rate of the vacuum gas atomization powder making, and reducing the use cost.

Claims

1. A crucible outer sheath used in vacuum atomization powder making, characterized in that, The crucible outer sheath includes: upper flange 1, upper flange 2, metal frame, lower flange 1, and lower flange 2. The specific structure is as follows: The metal frame is formed by welding vertical bars and notched rings. More than two notched rings are arranged coaxially up and down in the vertical direction, and more than two vertical bars are evenly arranged along the outer side of the notched rings. The upper end of each vertical bar is an upper bent end horizontally outward, and the lower end of each vertical bar is a lower bent end horizontally inward; Upper flange 1 and upper flange 2 are arranged opposite to each other up and down. The wall surface of the central circular hole of upper flange 2 closely adheres to the outer side of the vertical bars at the upper part of the metal frame. The upper bent ends of the vertical bars are clamped between upper flange 1 and upper flange 2. Upper flange 1, the upper bent end, and upper flange 2 are fixed by passing through upper bolts; Lower flange 1 and lower flange 2 are arranged opposite to each other up and down. The outer wall surface of lower flange 1 closely adheres to the inner side of the vertical bars at the lower part of the metal frame. The lower bent ends of the vertical bars are clamped between lower flange 1 and lower flange 2. Lower flange 1, the lower bent end, and lower flange 2 are fixed by passing through lower bolts; The notches of the notched rings face the same direction, and the notches are between two adjacent vertical bars; The diameter of the central circular hole of lower flange 1 is smaller than the diameter of the central circular hole of lower flange 2. The central circular holes of lower flange 1 and lower flange 2 form a stepped hole structure with the same axis, so that the arc-shaped end of the crucible is stuck at the stepped hole structure, ensuring the coaxiality of the crucible and the crucible outer sheath; The outside of the metal frame is wound and sealed with high-temperature resistant cloth, and the high-temperature resistant cloth is wound for 1 - 3 layers.

2. The crucible outer sheath used in vacuum gas atomization powder making according to claim 1, characterized in that, The width of the vertical bars and the notched rings is 15 - 40 mm, and the thickness is 1 - 3 mm.

3. The crucible outer sheath used in vacuum gas atomization powder making according to claim 1, characterized in that, The thickness of upper flange 1 and upper flange 2 is 5 mm - 20 mm, and the diameters of the central circular holes of upper flange 1 and upper flange 2 are the same.

4. The crucible outer sheath used in vacuum gas atomization powder making according to claim 1, characterized in that, Lifting rings are symmetrically installed at the top of upper flange 1.

5. The crucible outer sheath used in vacuum gas atomization powder making according to claim 1, characterized in that, The thickness of lower flange 1 and lower flange 2 is 5 mm - 20 mm, and the diameter of the central circular hole of lower flange 1 is in the range of 20 mm - 100 mm according to the size of the crucible outer sheath.

6. A method for using the crucible outer sheath used in true air atomization powder making according to any one of claims 1 to 5, characterized in that, It includes the following steps: (1) Tighten upper flange 1 and upper flange 2 with upper bolts to clamp the upper part of the metal frame, and tighten lower flange 1 and lower flange 2 with lower bolts to clamp the lower part of the metal frame; wind and seal the metal frame from the outside with high-temperature resistant cloth to ensure there are no gaps, thus forming a crucible outer sheath with an inner cavity; (2) Make the high-temperature resistant insulating paper into a cylindrical shape and place it in the crucible outer sheath and closely adhere to the inner side of the metal frame; (3) Place the crucible in the center of the inner cavity of the crucible outer sheath, fill magnesia or corundum sand between the crucible and the high-temperature resistant insulating paper, and bake the crucible and the crucible outer sheath with a hot air blower for standby.

7. The method of using the crucible outer sheath for true air atomization powder making according to claim 6, characterized in that, When it is necessary to quickly replace the crucible in a high-temperature state, lift the crucible outer sheath and the crucible quickly from the vacuum furnace through the lifting rings for replacement.

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