A heat treatment device and method for 60NiTi alloy

Abstract

The present invention relates to the field of alloy heat treatment technology, and in particular to a heat treatment device for 60NiTi alloy, comprising a base, a support frame symmetrically fixedly installed on the surface of the base, a rotating shaft rotatably installed on two of the support frames, a smelting furnace fixedly installed between the two rotating shafts, a furnace cover installed on the smelting furnace through a lifting assembly, a stepper motor fixedly installed on the side of the base through a support block, a first spur gear fixedly installed on one end of the output shaft of the stepper motor, a second spur gear fixedly installed on one end of one of the rotating shafts, and the first spur gear meshingly connected with the second spur gear. The present invention can drive the smelting furnace to flip 180 degrees after each heating is completed through the mutual cooperation of the stepper motor, the first spur gear, the second spur gear and the rotating shaft, thereby ensuring that the raw materials in the furnace are heated evenly, and a 60NiTi alloy ingot with uniform composition can be obtained, which is convenient for subsequent processing.

Description

Technical Field

[0001] The present invention relates to the technical field of alloy heat treatment, and in particular to a heat treatment device and method for a 60NiTi alloy. Background Art

[0002] Recent studies have found that compared with traditional tool steel, stainless steel and other bearing materials, 60NiTi alloy has become an ideal material for high-end bearings with long service life due to its many advantages such as low elastic modulus, high hardness, low density, large recoverable strain, high specific strength, non-magnetic, good dimensional stability, strong corrosion resistance and good lubricity. However, the wear resistance of 60NiTi alloy is far inferior to that of traditional tool steel and stainless steel and other bearing materials, which limits its application and development to a certain extent. In order to improve the wear resistance of 60NiTi alloy, it needs to be heat treated.

[0003] When smelting 60NiTi alloy, raw materials of sponge titanium and electrolytic nickel are usually placed in a vacuum arc melting furnace to be melted into alloy ingots. However, when smelting in an existing melting furnace, the heating temperature of the raw materials on the surface and inside of the furnace is different, so that the raw materials are heated unevenly, resulting in different degrees of dissolution of the raw materials, which in turn affects the production quality of the alloy ingots and affects subsequent processes. Summary of the invention

[0004] The purpose of the present invention is to solve the following shortcomings in the prior art: when smelting in the existing smelting furnace, the heating temperature of the raw material surface and the inside of the furnace are different, so that the raw material is heated unevenly, resulting in different degrees of dissolution of the raw material, which in turn affects the production quality of the alloy ingot and affects the subsequent processes, and a heat treatment device and method for 60NiTi alloy are proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A heat treatment device for 60NiTi alloy, comprising a base, support frames are symmetrically fixedly installed on the surface of the base, two rotating shafts are rotatably installed on the two support frames, a smelting furnace is fixedly installed between the two rotating shafts, and a plurality of arc generating devices are fixedly installed on the surface of the smelting furnace;

[0007] A furnace cover is installed on the smelting furnace through a lifting assembly, a vacuum suction pump is installed on the upper end of the furnace cover, a locking assembly for locking the furnace cover is provided on the surface of the smelting furnace, a stepper motor is fixedly installed on the side of the base through a supporting block, a first spur gear is fixedly installed on one end of the output shaft of the stepper motor, a second spur gear is fixedly installed on one end of one of the rotating shafts, and the first spur gear is meshingly connected with the second spur gear.

[0008] As a preferred solution, the lifting assembly includes a mounting block and a lifting rod fixedly mounted on the smelting furnace, a lifting hole is opened at the upper end of the mounting block, the lifting rod is vertically slidably mounted in the lifting hole, and the furnace cover is rotatably mounted on the lifting rod.

[0009] As a preferred solution, the locking assembly includes a fixed block fixedly installed on the furnace cover, a connecting block fixedly installed on the lower surface of the fixed block, a positioning block fixedly installed on the smelting furnace, and a limiting component arranged on the connecting block for limiting the position of the positioning block, a positioning hole is opened on the surface of the positioning block, and the connecting block is inserted into the positioning hole.

[0010] As a preferred solution, the lower end of the connecting block is symmetrically provided with an installation groove, and the limiting component includes a limiting block slidably installed in the installation groove, a telescopic spring fixedly installed in the installation groove and a pulling block fixedly installed on the limiting block, the other end of the telescopic spring is fixedly connected to the limiting block, the longitudinal section of the limiting block is a right-angled trapezoid, and one side of the limiting block is in contact with the lower surface of the positioning block.

[0011] As a preferred solution, a turntable is rotatably mounted on the bottom wall of the smelting furnace, a plurality of mixing rods are fixedly mounted on the surface of the turntable, a vertical rod is vertically fixedly mounted on the bottom wall of the smelting furnace, the turntable is rotatably sleeved on the vertical rod, and a transmission assembly for driving the turntable to rotate is provided on the vertical rod.

[0012] As a preferred solution, the transmission assembly includes two screw rods symmetrically fixedly mounted on the turntable, a counterweight block slidably mounted on the vertical rod and a stopper block fixedly mounted on the top of the vertical rod, and the counterweight block is sleeved on the two screw rods.

[0013] As a preferred solution, the surface of the counterweight block is symmetrically provided with slide grooves, two slide grooves are slidably installed with slide rails, and the two slide rails are fixedly installed on the vertical rod.

[0014] As a preferred solution, a rotating block is symmetrically rotatably mounted on the mixing rod, baffles are obliquely fixedly mounted on both sides of the rotating block, a stirring plate is fixedly mounted between every two baffles, and a plurality of rectangular holes are opened on the surface of the stirring plate.

[0015] A heat treatment method for a 60NiTi alloy, the treatment method comprising the following steps:

[0016] S1: 60NiTi alloy with a total mass of 100g is prepared according to the ratio of chemical composition 60NiTi. Before the preparation, the raw materials are washed in ethanol to remove impurities. Then, the low melting point nickel material is placed at the bottom of the melting furnace, and the high melting point sponge titanium is placed at the top of the melting furnace;

[0017] S2: The melting furnace is subjected to vacuum treatment, and then a certain amount of high-purity argon gas is injected into the melting furnace to heat the melting furnace under the action of the electric arc;

[0018] S3: After the melting furnace is heated once, the stepper motor is started to drive the melting furnace to turn 180 degrees through the first spur gear and the second spur gear;

[0019] S4: Repeat the previous step to smelt the raw materials 5 times to obtain a 60NiTi alloy ingot with uniform composition. Finally, the alloy ingot obtained by smelting is processed into a long-direction thin sheet with a size of 40 mm×20 mm×2 mm by wire cutting for subsequent processing.

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

[0021] 1. When the raw materials in the smelting furnace are smelted, the stepper motor, the first spur gear, the second spur gear and the rotating shaft cooperate with each other, and after each heating, the smelting furnace can be driven to turn 180 degrees, thereby ensuring that the raw materials in the furnace are heated evenly, and a 60NiTi alloy ingot with uniform composition can be obtained, which is convenient for subsequent processing;

[0022] 2. During the turning process of the smelting furnace, with the cooperation of the counterweight block, turntable, spiral rod and vertical rod, multiple mixing rods can be driven to rotate in the smelting furnace, thereby stirring the raw materials in the furnace, so that the raw materials can be fully dissolved, effectively improving the production quality of alloy ingots. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the front three-dimensional structure of a heat treatment device for 60NiTi alloy proposed by the present invention;

[0024] Figure 2 This is a bottom-up stereoscopic structural schematic diagram of a heat treatment device for 60NiTi alloy proposed by the present invention;

[0025] Figure 3 A schematic diagram of a rear-view stereoscopic structure of a heat treatment device for 60NiTi alloy with the furnace cover opened according to the present invention;

[0026] Figure 4 It is a schematic diagram of the three-dimensional cross-sectional structure of a melting furnace in a heat treatment device for 60NiTi alloy proposed by the present invention;

[0027] Figure 5 for Figure 2 The enlarged structural diagram at A in the middle;

[0028] Figure 6 for Figure 4 The enlarged structural diagram at B in the middle;

[0029] Figure 7 for Figure 4 Enlarged structural diagram at point C in the middle.

[0030] In the figure: 1 base, 2 support frame, 3 rotating shaft, 4 melting furnace, 5 arc generating device, 6 furnace cover, 7 stepping motor, 8 first spur gear, 9 second spur gear, 10 mounting block, 11 lifting rod, 12 fixing block, 13 connecting block, 14 positioning block, 15 limiting block, 16 telescopic spring, 17 pulling block, 18 turntable, 19 mixing rod, 20 vertical rod, 21 spiral rod, 22 counterweight block, 23 stopper, 24 slide rail, 25 rotating block, 26 baffle, 27 stirring plate. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Reference Figure 1-Figure 7 A heat treatment device and method for 60NiTi alloy, comprising a base 1, a support frame 2 is symmetrically fixedly installed on the surface of the base 1, a rotating shaft 3 is rotatably installed on the two support frames 2, a smelting furnace 4 is fixedly installed between the two rotating shafts 3, a plurality of arc generating devices 5 are fixedly installed on the surface of the smelting furnace 4 (the arc generating devices 5 are prior art and are not described in detail here), a furnace cover 6 is installed on the smelting furnace 4 through a lifting assembly, a vacuum suction pump is installed on the upper end of the furnace cover 6, and a lock for locking the furnace cover 6 is provided on the surface of the smelting furnace 4 A fixed component is prepared according to the ratio of 60NiTi with a total mass of 100g. Before the ingredients are prepared, the raw materials are put into ethanol for cleaning to remove impurities. Then the low melting point nickel material is placed at the bottom of the smelting furnace 4, and the high melting point sponge titanium is placed on the upper part of the smelting furnace 4. Then, the furnace cover 6 is covered by the locking component, the air in the smelting furnace 4 is evacuated by a vacuum suction pump, and a certain amount of high-purity argon gas is injected into the smelting furnace 4. Then, the arc generating device 5 is started to heat the smelting furnace 4 under the action of the arc.

[0033] A stepper motor 7 is fixedly mounted on the side of the base 1 through a support block, a first spur gear 8 is fixedly mounted on one end of the output shaft of the stepper motor 7, a second spur gear 9 is fixedly mounted on one end of one of the rotating shafts 3, and the first spur gear 8 is meshingly connected with the second spur gear 9.

[0034] After the smelting furnace 4 is heated once, the stepper motor 7 is started, and the first spur gear 8 is driven to rotate through the output shaft of the stepper motor 7. Since the first spur gear 8 is meshed and connected with the second spur gear 9, the rotating shaft 3 is driven to rotate through the second spur gear 9 until the smelting furnace 4 is turned over 180 degrees. During the turning process, the raw materials in the smelting furnace 4 are turned over, and then heated for a period of time, and then the stepper motor 7 is started again to drive the smelting furnace 4 to turn over 180 degrees. Repeat the previous step, turn the raw materials over 5 times and heat them, so as to ensure that a 60NiTi alloy ingot with uniform composition can be obtained, which is convenient for subsequent processing.

[0035] The lifting assembly includes a mounting block 10 and a lifting rod 11 fixedly mounted on the smelting furnace 4. A lifting hole is provided at the upper end of the mounting block 10. The lifting rod 11 is vertically slidably mounted in the lifting hole. The furnace cover 6 is rotatably mounted on the lifting rod 11. The locking assembly includes a fixed block 12 fixedly mounted on the furnace cover 6, a connecting block 13 fixedly mounted on the lower surface of the fixed block 12, a positioning block 14 fixedly mounted on the smelting furnace 4, and a limiting component arranged on the connecting block 13 for limiting the position with the positioning block 14. A positioning hole is provided on the surface of the positioning block 14. The connecting block 13 is inserted into the positioning hole. A mounting groove is symmetrically provided at the lower end of the connecting block 13. The limiting component includes a limiting block 15 slidably mounted in the mounting groove, a telescopic spring 16 fixedly mounted in the mounting groove, and a pulling block 17 fixedly mounted on the limiting block 15. The other end of the telescopic spring 16 is fixedly connected to the limiting block 15. The longitudinal section of the limiting block 15 is a right-angle trapezoid. One side of the limiting block 15 contacts the lower surface of the positioning block 14.

[0036] Under the action of the lifting rod 11 and the mounting block 10, the furnace cover 6 can be driven to move up and down on the smelting furnace 4. When it is necessary to contact and lock the furnace cover 6, the pull block 17 drives the limit block 15 to move in the direction of the telescopic spring 16 until the limit block 15 moves to the inner wall of the mounting groove. At this time, the limit block 15 is separated from the positioning block 14, and the connecting block 13 can be taken out from the positioning hole to release the lock of the furnace cover 6.

[0037] A turntable 18 is rotatably mounted on the inner bottom wall of the smelting furnace 4, and a plurality of mixing rods 19 are fixedly mounted on the surface of the turntable 18. A vertical rod 20 is vertically fixedly mounted on the inner bottom wall of the smelting furnace 4. The turntable 18 is rotatably sleeved on the vertical rod 20, and a transmission assembly for driving the turntable 18 to rotate is provided on the vertical rod 20. The transmission assembly includes two screw rods 21 symmetrically fixedly mounted on the turntable 18, a counterweight block 22 slidably mounted on the vertical rod 20, and a stopper 23 fixedly mounted on the top of the vertical rod 20, and the counterweight block 22 is sleeved on the two screw rods 21.

[0038] During the flipping process of the smelting furnace 4, the counterweight block 22 will move up and down on the vertical rod 20 under the action of gravity. Since the counterweight block 22 is mounted on the spiral rod 21, when the counterweight block 22 moves up and down on the vertical rod 20, under the action of the spiral rod 21, the spiral rod 21 will drive the spiral rod 21 to rotate around the vertical rod 20, thereby driving the turntable 18 to rotate through the spiral rod 21, and then driving the multiple mixing rods 19 to rotate through the turntable 18. During the rotation process, the mixing rods 19 mix and stir the raw materials in the smelting furnace 4, so that the raw materials can be flipped more fully, so that the raw materials can be fully dissolved, and the production quality of the alloy ingots can be effectively improved.

[0039] The surface of the counterweight block 22 is symmetrically provided with slide grooves, and slide rails 24 are slidably installed in the two slide grooves. The two slide rails 24 are fixedly installed on the vertical rod 20. Under the action of the slide rails 24, it is ensured that the counterweight block 22 can only slide on the vertical rod 20 and cannot rotate.

[0040] A rotating block 25 is symmetrically rotatably installed on the mixing rod 19, and baffles 26 are obliquely fixedly installed on both sides of the rotating block 25. A stirring plate 27 is fixedly installed between every two baffles 26, and a plurality of rectangular holes are provided on the surface of the stirring plate 27. During the rotation of the mixing rod 19, the obliquely installed baffles 26 will contact the raw materials in the smelting furnace 4. Under the action of the inclined surface, the rotating block 25 will be driven to rotate, and then the stirring plate 27 will be driven to rotate. During the rotation of the stirring plate 27, the rectangular holes can reduce the resistance of the stirring plate 27 to rotation, and the raw materials can be turned over more fully under the rotation of the stirring plate 27.

[0041] A heat treatment method for 60NiTi alloy, the treatment method comprising the following steps:

[0042] S1: preparing a 60NiTi alloy with a total mass of 100 g according to a ratio of 60NiTi. Before preparing the ingredients, the raw materials are washed in ethanol to remove impurities. Then, the low melting point nickel material is placed at the bottom of the smelting furnace 4, and the high melting point sponge titanium is placed at the top of the smelting furnace 4;

[0043] S2: performing vacuum treatment on the smelting furnace 4, and then injecting a certain amount of high-purity argon gas into the smelting furnace 4 to heat the smelting furnace 4 under the action of the electric arc;

[0044] S3: After the smelting furnace 4 is heated once, the stepper motor 7 is started, and the smelting furnace 4 is driven to turn 180 degrees through the first spur gear 8 and the second spur gear 9;

[0045] S4: Repeat the previous step to smelt the raw materials 5 times to obtain a 60NiTi alloy ingot with uniform composition. Finally, the alloy ingot obtained by smelting is processed into a long-direction thin sheet with a size of 40 mm×20 mm×2 mm by wire cutting for subsequent processing.

[0046] In the present invention, after the smelting furnace 4 is heated once by the electric arc, the stepper motor 7 is started, and the first spur gear 8 is driven to rotate by the output shaft of the stepper motor 7. Since the first spur gear 8 is meshed and connected with the second spur gear 9, the rotating shaft 3 is driven to rotate by the second spur gear 9 until the smelting furnace 4 is turned over 180 degrees. During the turning process, it is ensured that the raw materials in the smelting furnace 4 are turned over, and then heated for a period of time, and then the stepper motor 7 is started again to drive the smelting furnace 4 to turn over 180 degrees here, and the previous step is repeated. The raw materials are turned over 5 times for heating, thereby ensuring that a 60NiTi alloy ingot with uniform composition can be obtained, which is convenient for subsequent processing.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A heat treatment device for 60NiTi alloy, comprising a base (1), characterized in that: Support frames (2) are symmetrically fixedly mounted on the surface of the base (1); rotating shafts (3) are rotatably mounted on the two support frames (2); a smelting furnace (4) is fixedly mounted between the two rotating shafts (3); and a plurality of arc generating devices (5) are fixedly mounted on the surface of the smelting furnace (4); A furnace cover (6) is installed on the smelting furnace (4) via a lifting assembly, a vacuum suction pump is installed on the upper end of the furnace cover (6), a locking assembly for locking the furnace cover (6) is provided on the surface of the smelting furnace (4), a stepper motor (7) is fixedly installed on the side of the base (1) via a support block, a first spur gear (8) is fixedly installed at one end of the output shaft of the stepper motor (7), a second spur gear (9) is fixedly installed at one end of one of the rotating shafts (3), and the first spur gear (8) is meshingly connected with the second spur gear (9); A turntable (18) is rotatably mounted on the inner bottom wall of the smelting furnace (4), a plurality of mixing rods (19) are fixedly mounted on the surface of the turntable (18), a vertical rod (20) is vertically fixedly mounted on the inner bottom wall of the smelting furnace (4), the turntable (18) is rotatably sleeved on the vertical rod (20), and a transmission component for driving the turntable (18) to rotate is provided on the vertical rod (20); The transmission assembly comprises two screw rods (21) symmetrically fixedly mounted on the rotating disk (18), a counterweight block (22) slidably mounted on the vertical rod (20), and a stopper block (23) fixedly mounted on the top of the vertical rod (20), wherein the counterweight block (22) is sleeved on the two screw rods (21); The counterweight block (22) has symmetrical sliding grooves on its surface, and two sliding grooves are both slidably mounted with sliding rails (24), and the two sliding rails (24) are both fixedly mounted on the vertical rod (20).

2. A heat treatment device for 60NiTi alloy according to claim 1, characterized in that: The lifting assembly comprises a mounting block (10) fixedly mounted on the smelting furnace (4) and a lifting rod (11); a lifting hole is provided at the upper end of the mounting block (10); the lifting rod (11) is vertically slidably mounted in the lifting hole; and the furnace cover (6) is rotatably mounted on the lifting rod (11).

3. A heat treatment device for 60NiTi alloy according to claim 1, characterized in that: The locking assembly comprises a fixing block (12) fixedly mounted on the furnace cover (6), a connecting block (13) fixedly mounted on the lower surface of the fixing block (12), a positioning block (14) fixedly mounted on the smelting furnace (4), and a limiting component arranged on the connecting block (13) for limiting the position of the positioning block (14), wherein a positioning hole is formed on the surface of the positioning block (14), and the connecting block (13) is inserted into the positioning hole.

4. A heat treatment device for 60NiTi alloy according to claim 3, characterized in that: The lower end of the connecting block (13) is symmetrically provided with a mounting groove, and the limiting component comprises a limiting block (15) slidably mounted in the mounting groove, a telescopic spring (16) fixedly mounted in the mounting groove, and a pulling block (17) fixedly mounted on the limiting block (15), the other end of the telescopic spring (16) is fixedly connected to the limiting block (15), the longitudinal section of the limiting block (15) is a right-angled trapezoid, and one side of the limiting block (15) contacts the lower surface of the positioning block (14).

5. The heat treatment device of 60NiTi alloy according to claim 1, characterized in that: A rotating block (25) is symmetrically rotatably mounted on the mixing rod (19), baffles (26) are obliquely fixedly mounted on both side surfaces of the rotating block (25), a stirring plate (27) is fixedly mounted between every two baffles (26), and a plurality of rectangular holes are formed on the surface of the stirring plate (27).

6. A heat treatment method according to any one of claims 1 to 5, characterized in that: The processing method comprises the following steps: S1: preparing a 60NiTi alloy with a total mass of 100 g according to a ratio of 60NiTi, wherein the raw materials are washed in ethanol before mixing to remove impurities, and then the low melting point nickel material is placed at the bottom of the melting furnace (4), and the high melting point sponge titanium is placed at the top of the melting furnace (4); S2: performing vacuum treatment on the smelting furnace (4), then injecting a certain amount of high-purity argon gas into the smelting furnace (4), and heating the smelting furnace (4) under the action of an electric arc; S3: After the smelting furnace (4) is heated once, the stepper motor (7) is started, and the smelting furnace (4) is driven to turn 180 degrees through the first spur gear (8) and the second spur gear (9); S4: Repeat the previous step to smelt the raw materials 5 times to obtain a 60NiTi alloy ingot with uniform composition. Finally, the alloy ingot obtained by smelting is processed into a long-direction thin sheet with a size of 40 mm×20 mm×2 mm by wire cutting for subsequent processing.

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