Deep sea Christmas tree steel forging heat treatment device and treatment process thereof

Abstract

The invention relates to the technical field of metal heat treatment, and discloses a deep sea Christmas tree steel forging heat treatment device and a treatment process thereof. The invention provides a deep sea Christmas tree steel forging heat treatment device which comprises a clamp used for clamping a heated workpiece, supporting shafts are fixedly installed on the outer sides of clamping rods of the clamp, and fan blades are rotatably installed at the ends, away from the clamp, of the supporting shafts and used for driving the clamp to rotate under the action of a quenching medium. A plurality of supporting rods are fixedly mounted at the top of the clamp, and a connecting column is fixedly mounted at the top ends of the supporting rods jointly. Bubbles rising from the bottom of a workpiece are pushed outwards in the horizontal direction through rotation of the fan blades, the phenomenon of non-uniform quenching caused by bubble gathering is effectively reduced through dispersion and export of the bubbles, it is ensured that a quenching medium can make contact with each surface of the workpiece more uniformly without hindrance, and the quenching efficiency is improved. And therefore, the uniformity of the whole workpiece in the quenching process is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal heat treatment, and particularly relates to a deep-sea Christmas tree steel forging heat treatment device and a treatment process thereof. BACKGROUND

[0002] When producing deep-sea Christmas tree related parts, such as tubing hangers and Christmas tree caps, strict heat treatment is required to ensure that they can withstand high pressure, resist corrosion and have sufficient strength in deep-sea environments. During heat treatment, the workpiece heated to a specific temperature is accurately moved into the quenching tank by hoisting machinery and clamps for rapid cooling to achieve the required hardness and strength.

[0003] In order to improve the cooling effect of the workpiece in the quenching tank, a stirring mechanism is usually installed at the bottom of the quenching tank. The stirring mechanism is driven by mechanical or hydraulic means and can continuously stir the quenching medium in the tank to form a circulating flow, so that the medium temperature near the workpiece remains relatively low. The quenching medium near the workpiece does not remain stationary and rapidly heats up due to heat exchange, which affects the quenching effect. Through the strong stirring action of the quenching medium, the bubbles generated on the surface of the workpiece due to high temperature can be dispersed or carried away, reducing the probability of bubbles adhering to the surface of the workpiece to form quenching defects.

[0004] However, although the stirring mechanism effectively accelerates the circulation of the quenching medium and helps to carry away the bubbles, in the process of water flow stirring and upward rolling, the high-temperature workpiece will form a thin vapor film around the bubbles in the quenching liquid. The vapor film will hold the bubbles, further hindering the bubbles from detaching from the surface of the workpiece, especially in dead corners such as grooves and chamfers of the workpiece. At the same time, bubbles located at the bottom of the workpiece and not in contact with the surface of the workpiece bottom will move to the top of the workpiece as the quenching medium rises. Some of these bubbles continue to move upward to the surface of the quenching liquid, and some are intercepted by the top of the workpiece and then adhere to the top surface of the workpiece under the action of surface tension. These bubbles gather on the surface of the workpiece, forming a heat barrier that hinders direct contact between the quenching medium and the workpiece, thereby affecting the quenching speed and uniformity of the workpiece. This may cause the workpiece to have insufficient quenching or incomplete organization transformation, thereby affecting the performance and service life of the entire part. SUMMARY

[0005] The present application provides a deep-sea Christmas tree steel forging heat treatment device and a treatment process thereof, which has the advantages of dispersing and guiding the bubbles from the bottom of the workpiece, reducing the probability of bubbles moving upward and gathering on the top of the workpiece, and ensuring that the quenching medium can more uniformly and unobstructed contact every surface of the workpiece, thereby improving the overall quenching uniformity of the workpiece. The present application solves the problem of the workpiece in the quenching tank being affected by the bubbles generated by the quenching medium due to heat, which move upward to the surface of the workpiece and affect the overall quenching uniformity and service life of the workpiece.

[0006] To achieve the above objectives, this application adopts the following technical solution: a heat treatment device for deep-sea oil production tree steel forgings, including a clamp for clamping the heated workpiece, characterized in that a flow guiding mechanism is symmetrically installed on the outer side of the clamping rod of the clamp, the flow guiding mechanism being used to meet the flow of quenching medium and drive the clamp to rotate.

[0007] Preferably, the flow guiding mechanism is used to accommodate the horizontal flow of the quenching medium. The flow guiding mechanism includes a fan blade and a support shaft for supporting the rotation of the fan blade. The support shaft is fixedly installed on the outside of the clamping rod of the fixture.

[0008] Preferably, the flow guiding mechanism is used to accommodate the vertical flow of the quenching medium. The flow guiding mechanism includes flow guiding blades, which are fixedly installed on the outside of the clamping rod of the fixture. The flow guiding direction of the flow guiding blades causes the quenching medium to flow away from the fixture.

[0009] Preferably, the top of the fixture is fixedly equipped with multiple support rods, and the top ends of the multiple support rods are jointly fixedly equipped with a connecting column. The top of the connecting column is movably equipped with an adjusting column, and the adjusting column has an installation groove inside. The top end of the connecting column movably extends into the installation groove. An adjusting ring adapted to the installation groove is fixedly installed on the outer side of the top end of the connecting column. Multiple support springs arranged in a circular array are fixedly installed on the inner bottom wall of the installation groove. The top ends of the support springs are slidably connected to the bottom wall of the adjusting ring. The adjusting column has an adjusting groove inside, and the adjusting groove is positioned above the installation groove. The top end of the connecting column movably extends into the adjusting groove. Multiple locking blocks arranged in a circular array are fixedly installed on the inner bottom wall of the adjusting groove. A locking groove is formed between two adjacent locking blocks. A locking post adapted to the locking groove is fixedly installed on the outer side of the top end of the connecting column to maintain the stability of the workpiece when the fixture moves the workpiece.

[0010] Preferably, the top of the card block is provided with an arc-shaped bevel to assist the card post in smoothly entering the card slot.

[0011] Preferably, a fixing plate is fixedly installed at the top of the support spring, a connecting rod is fixedly installed at the top of the fixing plate, a ball is fixedly installed at the top of the connecting rod, and a limiting groove adapted to the ball is opened inside the adjusting ring.

[0012] Preferably, the bottom of the adjusting ring is provided with a groove adapted to the ball, and the ring width of the limiting groove is greater than the ring width of the groove.

[0013] A heat treatment process for deep-sea oil production tree steel forgings includes the following processing steps:

[0014] S1. When moving the clamp, adjusting column and workpiece by hoisting machinery, the clamping column is placed in a certain slot under the action of the gravity of the clamp and workpiece to maintain the stability of the workpiece during the movement process.

[0015] S2. As the workpiece gradually enters the quenching medium, under the action of buoyancy and the elastic force of the supporting spring, the connecting column and the locking column gradually move upward, releasing the locking groove from limiting the locking column.

[0016] S3. In the quenching tank, under the action of the flowing quenching medium, the fan blades rotate to push the bubbles generated at the bottom of the workpiece outward in the horizontal direction, so as to avoid the bubbles accumulating at the top of the workpiece and affecting the overall quenching uniformity of the workpiece.

[0017] S4. When the quenching medium moves under the action of the fan blades, it will also give the fan blades a reaction force, so that when the fan blades rotate, they can push the fixture and the workpiece to rotate, allowing the quenching medium to contact every surface of the workpiece more evenly.

[0018] The beneficial effects of this invention are as follows:

[0019] This application provides a heat treatment device and process for deep-sea oil production tree steel forgings. When the workpiece is cooled in the quenching medium, the guiding mechanism rotates under the flow thrust of the quenching medium to push the bubbles rising from the bottom of the workpiece outward in the horizontal direction. The dispersion and discharge of the bubbles effectively reduces the uneven quenching phenomenon caused by bubble aggregation, ensuring that the quenching medium can contact every surface of the workpiece more evenly and without obstruction. This improves the overall uniformity of the workpiece during the quenching process and avoids problems such as insufficient quenching or incomplete microstructure transformation at the top of the workpiece. As a result, the workpiece has more consistent and stable physical and chemical properties after quenching, meeting the production requirements of high-precision and high-requirement workpieces. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the main cross-sectional structure of the connecting column and adjusting column in the snap-fit ​​state of the present invention;

[0023] Figure 3 This is a schematic diagram of the main cross-sectional structure of the connecting column and adjusting column of the present invention in the state of being unhooked;

[0024] Figure 4 This is a schematic diagram of the front cross-sectional structure of the adjusting column of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the support rod, connecting column, and adjusting ring of the present invention;

[0026] Figure 6 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0027] Figure 7 This is a schematic diagram of the structure of the fixture of the present invention with externally mounted guide fan blades.

[0028] In the diagram: 1. Clamp; 2. Support rod; 3. Connecting column; 4. Adjusting column; 5. Support shaft; 6. Fan blade; 7. Mounting groove; 8. Adjusting ring; 9. Support spring; 10. Adjusting groove; 11. Locking block; 12. Locking column; 13. Fixing plate; 14. Connecting rod; 15. Ball bearing; 16. Limiting groove; 17. Slide groove; 18. Guide fan blade. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] See Figures 1 to 7 A heat treatment device and process for deep-sea oil production tree steel forgings include a clamp 1 for clamping the heated workpiece. A flow guiding mechanism is symmetrically installed on the outer side of the clamping rod of the clamp 1. The flow guiding mechanism is used to drive the clamp 1 to rotate in order to meet the flow of the quenching medium. The flow guiding mechanism is used to meet the horizontal and vertical flow of the quenching medium.

[0031] See Figure 1 Regarding the flow guiding mechanism to accommodate the horizontal flow of the quenching medium, a support shaft 5 is fixedly installed on the outside of the clamping rod of the fixture 1, and the support shaft 5 is inclined. A fan blade 6 is rotatably installed on the end of the support shaft 5 away from the fixture 1.

[0032] See Figure 7 Regarding the flow guiding mechanism to accommodate the vertical flow of the quenching medium, a flow guiding fan blade 18 is fixedly installed on the outside of the clamping rod of the fixture 1. The flow guiding direction of the flow guiding fan blade 18 causes the quenching medium to flow away from the fixture 1.

[0033] Multiple support rods 2 are fixedly installed on the top of the clamp 1. A connecting column 3 is fixedly installed on the top of the multiple support rods 2. An adjusting column 4 is movably installed on the top of the connecting column 3. A hoisting machine is connected to the top of the adjusting column 4.

[0034] The rotation of clamp 1 requires relative rotation installation in conjunction with the hoisting machinery. Without considering the rotation problem during the hoisting process, the adjusting column 4 is directly installed with the hook of the hoisting machinery using a rotating disk, which can both bear weight and rotate.

[0035] If the issue of limiting rotation during hoisting is considered, the following settings should be used:

[0036] The hoisting machinery moves the clamp 1 and the workpiece on the clamp 1 through the adjusting column 4, connecting column 3 and support rod 2. The adjusting column 4 has an installation groove 7 inside. The top of the connecting column 3 extends into the installation groove 7. An adjusting ring 8 that matches the installation groove 7 is fixedly installed on the outer side of the top of the connecting column 3. Multiple support springs 9 arranged in a ring array are fixedly installed on the inner bottom wall of the installation groove 7. The top of the support spring 9 is slidably connected to the bottom wall of the adjusting ring 8. During the process of moving the clamp 1 and the workpiece by the hoisting machinery, the bottom wall of the adjusting ring 8 compresses the support spring 9 under the gravity of the clamp 1 and the workpiece. As the workpiece gradually enters the quenching medium, the buoyancy of the quenching medium on the clamp 1 and the workpiece gradually increases, which gradually reduces the pressure on the support spring 9. The elasticity of the support spring 9 causes the adjusting ring 8 to no longer be firmly pressed on the inner bottom wall of the installation groove 7.

[0037] At this time, the stirring equipment in the quenching tank drives the quenching medium to flow and surge in the horizontal direction. The fan blade 6 rotates under the action of the quenching medium, destroying the vapor film on which the bubbles adhere, reducing bubble adhesion. It can push the bubbles generated by the contact between the quenching medium and the workpiece surface outward in the horizontal direction of the workpiece. It can also stir and disperse the bubbles generated by the contact between the bottom surface of the workpiece and the quenching medium during the upward movement of the bubbles, reducing the probability of the bubbles moving upward with the quenching medium and adhering to the top surface of the workpiece, thus improving the overall quenching uniformity of the workpiece. According to Newton's third law, the fan blade 6 will give the quenching medium a reaction force. This reaction force will be transmitted to the fixture 1 through the support shaft 5 of the fan blade 6. The inclined support shaft 5 allows the fan blade 6 to push the fixture 1 to rotate when it is under force, so that the fixture 1, the connecting column 3 and the workpiece are no longer in a relatively static state, thereby assisting the quenching medium in cooling the workpiece, making the quenching effect better, and reducing the probability of uneven quenching of the workpiece due to the upward movement and adhesion of bubbles on the top surface of the workpiece.

[0038] Reference Figures 2 to 4The adjusting column 4 has an adjusting groove 10 inside, and the adjusting groove 10 is positioned above the mounting groove 7. The top of the connecting column 3 extends movably into the adjusting groove 10. Multiple locking blocks 11 arranged in a circular array are fixedly installed on the inner bottom wall of the adjusting groove 10. The top of the locking blocks 11 is set with an arc-shaped bevel, and a locking groove is formed between two adjacent locking blocks 11. A locking post 12 that matches the locking groove is fixedly installed on the outer side of the top of the connecting column 3. When the supporting spring 9 is compressed under the gravity of the workpiece and the clamp 1, the locking post 12 is placed in a certain locking groove. The locking groove limits the locking post 12, allowing the lifting machinery to pass through. When the workpiece is moved by the adjusting column 4 and connecting column 3, the workpiece becomes more stable, preventing it from rotating. When the fixture 1 and the workpiece move upward due to buoyancy, the connecting column 3 also moves the locking column 12 upward. The locking column 12 is no longer limited by the locking groove, allowing the workpiece placed in the quenching medium to rotate. After the workpiece has been quenched, as the hoisting machinery moves the fixture 1, adjusting column 4, and workpiece upward, the connecting column 3 and adjusting ring 8 gradually move downward. The locking block 11, with its arc-shaped inclined surface at the top, facilitates the locking column 12 to move downward into a locking groove to continue limiting the rotation of the workpiece and maintaining its stability.

[0039] Reference Figure 3 and Figure 6 A fixing plate 13 is fixedly installed on the top of the supporting spring 9, a connecting rod 14 is fixedly installed on the top of the fixing plate 13, and a ball bearing 15 is fixedly installed on the top of the connecting rod 14. A limiting groove 16 adapted to the ball bearing 15 is opened inside the adjusting ring 8, and a sliding groove 17 adapted to the ball bearing 15 is opened at the bottom of the adjusting ring 8. The ring width of the limiting groove 16 is greater than the ring width of the sliding groove 17. By limiting and sliding the ball bearing 15 inside the limiting groove 16, the adjusting ring 8 will not be affected by the supporting spring 9 and will not be able to rotate when it rotates with the connecting column 3. At the same time, when the adjusting ring 8 moves upward, the ball bearing 15 will also be limited by the sliding groove 17 and will not be able to slide out of the limiting groove 16, thus maintaining the positional stability of the supporting spring 9.

[0040] When the quenching medium is pushed from bottom to top by a pusher to quench the workpiece, the quenching medium moves from bottom to top. When the quenching medium brings the air bubbles into contact with the guide fan blades 18, they will spread outward in the horizontal direction along the shape of the guide fan blades 18. This also reduces the probability of the air bubbles moving upward and accumulating on the top of the workpiece. The pushing force of the quenching medium on the guide fan blades 18 causes the fixture 1 and the workpiece to rotate, thereby effectively reducing the uneven quenching phenomenon caused by air bubble accumulation. This ensures that the quenching medium can contact every surface of the workpiece more evenly and without obstruction, thereby improving the overall uniformity of the workpiece during the quenching process.

[0041] Whether the quenching tank uses a side-mounted stirring device or a bottom-mounted pusher, whether the fixture 1 can rotate under the action of reaction force or thrust depends on factors such as the flow rate of the quenching medium, the weight of the fixture 1 and the workpiece, and the friction between the connecting column 3 and the adjusting column 4. Therefore, when quenching workpieces of different weights, it is necessary to change the output power of the stirring device or the pusher to ensure that the flow rate of the quenching medium is sufficient to support the rotation of the fixture 1 and the workpiece.

[0042] A heat treatment process for deep-sea oil production tree steel forgings includes the following processing steps:

[0043] S1. When the clamp 1, adjusting column 4 and workpiece are moved by the hoisting machinery, the clamp 12 is placed in a certain slot under the gravity of the clamp 1 and the workpiece to maintain the stability of the workpiece during the movement.

[0044] S2. As the workpiece gradually enters the quenching medium, under the action of buoyancy and the elastic force of the supporting spring 9, the connecting column 3 and the locking column 12 gradually move upward, releasing the locking groove from limiting the locking column 12.

[0045] S3. In the quenching tank, under the action of the flowing quenching medium, the fan blade 6 rotates to push the bubbles generated at the bottom of the workpiece outward in the horizontal direction, so as to avoid the bubbles accumulating at the top of the workpiece and affecting the overall quenching uniformity of the workpiece.

[0046] S4. When the quenching medium moves under the action of the fan blade 6, it will also give the fan blade 6 a reaction force, so that when the fan blade 6 rotates, it can push the fixture 1 and the workpiece to rotate, so that the quenching medium can contact every surface of the workpiece more evenly.

[0047] Working principle:

[0048] When the hoisting machinery moves the clamp 1 and the workpiece on the clamp 1 through the adjusting column 4, connecting column 3 and support rod 2, the support spring 9 is compressed under the gravity of the workpiece and the clamp 1. The locking column 12 is placed in a certain locking groove. The locking groove limits the locking column 12, making the workpiece more stable when the hoisting machinery moves the workpiece through the adjusting column 4 and connecting column 3, preventing the workpiece from rotating. As the workpiece gradually enters the quenching medium, the buoyancy of the quenching medium on the clamp 1 and the workpiece gradually increases, which makes the pressure on the support spring 9 gradually decrease. The elasticity of the support spring 9 makes the adjusting ring 8 no longer firmly pressed on the inner bottom wall of the mounting groove 7, and the locking column 12 also moves upward and is no longer limited by the locking groove.

[0049] At this point, for quenching tanks using side-mounted stirring equipment, the fan blades 6 rotate under the action of the quenching medium to push the bubbles generated by the contact between the quenching medium and the workpiece outward in the horizontal direction of the workpiece. During the upward movement of the bubbles generated by the contact between the bottom surface of the workpiece and the quenching medium, the fan blades 6 stir and disperse them. For quenching tanks using bottom-mounted flow pumps to stir the quenching medium, the quenching medium moves upward and follows the shape of the guide fan blades 18, also moving outward in the horizontal direction. Both methods prevent the bubbles from moving upward with the quenching medium to the top of the workpiece, thus reducing the probability of bubbles accumulating in large quantities on the top surface of the workpiece and effectively reducing the impact of air bubbles. The uneven quenching caused by bubble aggregation is mitigated by the dispersion and removal of bubbles, ensuring that the quenching medium can contact every surface of the workpiece more evenly and without obstruction, thus improving the overall quenching uniformity of the workpiece. When the quenching medium moves under the action of the fan blade 6 or the guide fan blade 18, it is also subjected to a reaction force, causing the fixture 1 to rotate. The fixture 1, the connecting column 3, and the workpiece are no longer in a relatively static state, allowing the quenching medium to contact every surface of the workpiece more evenly, assisting the quenching medium in cooling the workpiece. The workpiece can reach the required quenching temperature more quickly, and while maintaining uniform quenching, the quenching time is effectively shortened, thus improving the quenching quality of the workpiece.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat treatment apparatus for deep-sea oil production tree steel forgings, comprising a clamp (1) for clamping the heated workpiece, characterized in that, The clamp (1) has a flow guiding mechanism symmetrically installed on the outer side of the clamping rod. The flow guiding mechanism is used to meet the flow of the quenching medium and drive the clamp (1) to rotate.

2. The heat treatment device for deep-sea oil production tree steel forgings according to claim 1, characterized in that, The flow guiding mechanism is used to accommodate the horizontal flow of the quenching medium. The flow guiding mechanism includes a fan blade (6) and a support shaft (5) for supporting the rotation of the fan blade (6). The support shaft (5) is fixedly installed on the outside of the clamping rod of the fixture (1).

3. The heat treatment device for deep-sea oil production tree steel forgings according to claim 1, characterized in that, The flow guiding mechanism is used to meet the vertical flow of the quenching medium. The flow guiding mechanism includes a flow guiding fan (18), which is fixedly installed on the outside of the clamping rod of the fixture (1). The flow guiding direction of the flow guiding fan (18) makes the quenching medium flow away from the fixture (1).

4. The heat treatment device for deep-sea oil production tree steel forgings according to claim 1, characterized in that, The clamp (1) has multiple support rods (2) fixedly installed on its top. A connecting column (3) is fixedly installed on the top of each of the support rods (2). An adjusting column (4) is movably installed on the top of the connecting column (3). An installation groove (7) is provided inside the adjusting column (4). The top of the connecting column (3) extends movably into the installation groove (7). An adjusting ring (8) adapted to the installation groove (7) is fixedly installed on the outer side of the top of the connecting column (3). Multiple support springs (9) arranged in a circular array are fixedly installed on the inner bottom wall of the installation groove (7). The top end of the spring (9) is slidably connected to the bottom wall of the adjusting ring (8). An adjusting groove (10) is provided inside the adjusting column (4), and the adjusting groove (10) is placed above the mounting groove (7). The top end of the connecting column (3) extends through the interior of the adjusting groove (10). Multiple locking blocks (11) arranged in a circular array are fixedly installed on the inner bottom wall of the adjusting groove (10). A locking groove is formed between two adjacent locking blocks (11). A locking post (12) that matches the locking groove is fixedly installed on the outer side of the top end of the connecting column (3) to maintain the stability of the workpiece when the fixture (1) moves the workpiece.

5. A heat treatment device for deep-sea oil production tree steel forgings according to claim 4, characterized in that, The top of the card block (11) is set with an arc-shaped slope to assist the card post (12) in smoothly entering the card slot.

6. The heat treatment apparatus for deep-sea oil production tree steel forgings according to claim 5, characterized in that, A fixing plate (13) is fixedly installed at the top of the support spring (9), a connecting rod (14) is fixedly installed at the top of the fixing plate (13), a ball (15) is fixedly installed at the top of the connecting rod (14), and a limiting groove (16) adapted to the ball (15) is opened inside the adjusting ring (8).

7. A heat treatment device for deep-sea oil production tree steel forgings according to claim 6, characterized in that, The bottom of the adjusting ring (8) is provided with a sliding groove (17) that is adapted to the ball (15), and the ring width of the limiting groove (16) is greater than the ring width of the sliding groove (17).

8. The heat treatment process for deep-sea oil production tree steel forgings according to claim 4, characterized in that, The processing steps include the following: S1. When the clamp (1), adjusting column (4) and workpiece are moved by the hoisting machinery, the clamp (12) is placed in a certain slot under the gravity of the clamp (1) and the workpiece to maintain the stability of the workpiece during the movement process. S2. As the workpiece gradually enters the quenching medium, under the action of buoyancy and the elastic force of the supporting spring (9), the connecting column (3) and the locking column (12) gradually move upward, releasing the locking groove from limiting the locking column (12); S3. In the quenching tank, under the action of the flowing quenching medium, the fan blade (6) rotates to push the bubbles generated at the bottom of the workpiece outward in the horizontal direction, so as to avoid the bubbles from accumulating at the top of the workpiece and affecting the overall quenching uniformity of the workpiece. S4. When the quenching medium moves under the action of the fan blade (6), it will also give the fan blade (6) a reaction force, so that when the fan blade (6) rotates, it can push the fixture (1) and the workpiece to rotate, so that the quenching medium can contact each surface of the workpiece more evenly.

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