Crack-resistant mold steel quenching process

Abstract

The application discloses a kind of anti-crack die steel quenching processes, including quenching furnace body, the quenching furnace body is symmetrically provided with feed inlet and discharge port, the feed inlet of the quenching furnace body and the discharge port are equipped with the cover plate for closing feed inlet and discharge port, the feed inlet of the quenching furnace body is equipped with the quenching feeding mechanism for sending the anti-crack die steel to be quenched into the inside of quenching furnace body, the discharge port of the quenching furnace body is equipped with the quenching material taking mechanism for taking out the anti-crack die steel after quenching from the inside of quenching furnace body;The application is convenient to send the anti-crack die steel to be quenched into the inside of quenching furnace body and carry out heating treatment, also convenient to take out the anti-crack die steel after quenching from the discharge port of quenching furnace body and send into the inside of cold treatment box body to realize cooling treatment, avoid the current need to clamp into the cooling water tank after heating die steel for a period of time and send into the inside to influence die steel heat treatment efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of mold steel processing, specifically a quenching process for crack-resistant mold steel. Background Technology

[0002] Die steel is a type of steel used to manufacture molds such as cold stamping dies, hot forging dies, and die casting molds. Molds are the main processing tools for manufacturing parts in industries such as machinery manufacturing, radio instruments, motors, and electrical appliances. The quality of the mold directly affects the quality of the pressure processing, the precision and output of the product, and the production cost. In addition to reasonable structural design and machining accuracy, the quality and service life of the mold are mainly affected by the mold material and heat treatment.

[0003] When quenching anti-crack mold steel, current quenching processes are mostly inconvenient for placing the mold steel into the quenching furnace, and also inconvenient for taking the quenched mold steel out of the quenching furnace. After taking it out, it also needs to be transported to a cooling treatment device for cooling treatment, which affects the efficiency of the mold steel quenching process. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a quenching process for crack-resistant mold steel.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] This invention discloses a quenching process for anti-crack mold steel, comprising a quenching furnace body with symmetrically arranged inlet and outlet ports. Both the inlet and outlet ports are equipped with sealing plates. The inlet port is equipped with a quenching feeding mechanism for feeding the anti-crack mold steel to be quenched into the furnace body. The outlet port is equipped with a quenching removal mechanism for removing the quenched anti-crack mold steel from the furnace body. A cold treatment chamber is located outside the furnace body, directly below the quenching removal mechanism.

[0007] As a preferred technical solution of the present invention, the top of the quenching furnace body is provided with a lifting mechanism for driving the cover plate to open or close. The lifting mechanism includes a push plate provided at the top of the cover plate, and an electric push rod for driving the push plate to lift is installed at the top of the quenching furnace body. A sliding cavity matching the cover plate is opened on the quenching furnace body.

[0008] As a preferred embodiment of the present invention, T-shaped grooves are provided on both sides of the inlet and outlet, and sliders that match the grooves are provided on both sides of the cover plate.

[0009] As a preferred embodiment of the present invention, the quenching feeding mechanism includes a feeding seat located at the inlet of the quenching furnace body. The bottom end of the feeding seat is provided with a first wedge-shaped groove. A first reciprocating screw is provided inside the first wedge-shaped groove. A first wedge-shaped block that matches and slides on the first reciprocating screw is threadedly connected to the first wedge-shaped groove. A first reduction motor that drives the first reciprocating screw to rotate is installed at the end of the feeding seat. The bottom end of the first wedge-shaped block is provided with a gripping component for gripping the anti-crack mold steel to be quenched.

[0010] As a preferred embodiment of the present invention, the gripping assembly includes a mounting base at the bottom end of the first wedge block, a vertically downward first hydraulic cylinder mounted at the bottom end of the mounting base, and a first mechanical gripper provided on the output shaft of the first hydraulic cylinder.

[0011] As a preferred embodiment of the present invention, the quenching material taking mechanism includes a material taking seat located at the discharge port of the quenching furnace body. The bottom end of the material taking seat is provided with a second wedge-shaped groove. A second reciprocating screw is provided inside the second wedge-shaped groove. A second wedge-shaped block that matches and slides with the second wedge-shaped groove is threaded onto the second reciprocating screw. The bottom end of the material taking seat is provided with a material taking component for taking out the quenched anti-crack mold steel. A second reduction motor that drives the second reciprocating screw to rotate is installed on the material taking seat.

[0012] As a preferred embodiment of the present invention, the material handling assembly includes a movable plate disposed at the bottom end of the second wedge block, a vertically downward second hydraulic cylinder mounted at the bottom end of the movable plate, and a second mechanical gripper disposed at the bottom end of the second hydraulic cylinder.

[0013] As a preferred embodiment of the present invention, the interior of the cold treatment chamber is provided with a mesh plate, and a third hydraulic cylinder for driving the mesh plate is installed on both sides of the material taking seat. Movable grooves are provided on both sides of the inner wall of the cold treatment chamber, and movable shafts matching the movable grooves are provided on both sides of the mesh plate. A notch is provided on the end of the cold treatment chamber away from the quenching furnace body.

[0014] As a preferred embodiment of the present invention, a feeding conveyor belt is provided at the inlet of the quenching furnace body, and a discharge conveyor belt is provided at one end of the cold treatment box body near the notch.

[0015] As a preferred embodiment of the present invention, the quenching process steps are as follows:

[0016] a. The feeding conveyor belt moves the anti-crack mold steel to be quenched. The cover plate at the feed port is opened, and the first mechanical gripper grabs the anti-crack mold steel to be quenched. During the rotation of the first reciprocating screw, the gripped anti-crack mold steel to be quenched is fed from the feed port into the interior of the quenching furnace for heating. The cover plate at the feed port is closed, and the temperature is maintained for a period of time.

[0017] b. Open the cover plate at the discharge port, and the second mechanical gripper takes the quenched anti-crack mold steel out of the quenching furnace and sends it into the mesh plate inside the cold treatment box for cooling treatment.

[0018] c. After cooling for a period of time, the output shaft of the third hydraulic cylinder drives the mesh plate to move upward. The movable shaft on the mesh plate moves upward along the direction of the movable groove until the movable shaft near the end of the notch reaches its end. Then the mesh plate rotates around the movable shaft at this end, causing the mesh plate to tilt and slide the cooled anti-crack mold steel into the interior of the discharge conveyor belt.

[0019] The beneficial effects of this invention are:

[0020] 1. In this type of quenching process for anti-crack mold steel, when quenching the mold steel, the cover plate at the feed port of the quenching furnace is opened, and the quenching feeding mechanism feeds the anti-crack mold steel to be quenched into the interior of the quenching furnace for heating. After the cover plate at the feed port is closed and heating is carried out for a period of time, the cover plate at the discharge port is opened, and the quenching unloading mechanism takes out the quenched mold steel from the discharge port and sends it into the interior of the cold treatment box for cooling. This facilitates the feeding of the anti-crack mold steel to be quenched into the interior of the quenching furnace for heating treatment, and also facilitates the removal of the quenched anti-crack mold steel from the discharge port of the quenching furnace and sending it into the interior of the cold treatment box for cooling treatment. This avoids the current situation where the mold steel needs to be heated for a period of time and then clamped out and sent into the cooling water tank, which affects the heat treatment efficiency of the mold steel.

[0021] 2. In this anti-crack mold steel quenching process, when the mold steel is fed into the quenching furnace, the cover plate of the feed port is opened, the output shaft of the first hydraulic cylinder pushes the first mechanical gripper downward, the first mechanical gripper grabs the mold steel, the output shaft of the first hydraulic cylinder resets, the output shaft of the first reduction motor drives the first reciprocating screw to rotate, the rotation of the first reciprocating screw meshes with the first wedge block, causing the first wedge block to move along the direction of the first wedge groove, the first wedge block drives the feeding seat to move, the feeding seat drives the first hydraulic cylinder and the first mechanical gripper to move, thereby sending the mold steel grabbed by the first mechanical gripper into the interior of the quenching furnace for heating.

[0022] 3. In this anti-crack mold steel quenching process, when the quenched mold steel is taken out from the inside of the quenching furnace, the cover plate at the discharge port is opened, the output shaft of the second reduction motor drives the second reciprocating screw to rotate, the second reciprocating screw meshes with the second wedge block, causing the second wedge block to move along the direction of the second wedge groove, the second wedge block drives the movable plate to extend from the discharge port into the inside of the quenching furnace, the output shaft of the second hydraulic cylinder moves downward, the second mechanical gripper grabs the quenched mold steel, and the movable plate sends the grabbed mold steel out from the inside of the quenching furnace, thus facilitating the removal of the quenched mold steel from the quenching furnace and placing it into the cold treatment chamber. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a structural cross-sectional view of a quenching process for anti-crack mold steel according to the present invention;

[0025] Figure 2 This is a cross-sectional view of the quenching feeding mechanism structure of the quenching process for anti-crack mold steel according to the present invention.

[0026] Figure 3 This is a cross-sectional view of the quenching material handling mechanism structure of the quenching process for anti-crack mold steel according to the present invention;

[0027] Figure 4 This is a cross-sectional view of the lifting mechanism structure of the anti-crack mold steel quenching process of the present invention;

[0028] Figure 5 This is a cross-sectional view of the cold treatment box and mesh plate connection structure of the quenching process for anti-crack mold steel according to the present invention.

[0029] Figure 6 This is a schematic diagram of the cover plate structure of the anti-crack mold steel quenching process of the present invention.

[0030] In the diagram: 1. Quenching furnace body; 2. Feed inlet; 3. Discharge outlet; 4. Cover plate; 5. Quenching feeding mechanism; 6. Quenching material handling mechanism; 7. Cold treatment chamber; 8. Lifting mechanism; 9. Push plate; 10. Electric push rod; 11. Sliding cavity; 12. Slide groove; 13. Sliding block; 14. Feeding seat; 15. First wedge groove; 16. First reciprocating screw; 17. First wedge block; 18. First geared motor; 19. Gripping assembly; 20. Mounting base; 21. First hydraulic cylinder; 22. First mechanical gripper; 23. Material handling seat; 24. Second wedge groove; 25. Second reciprocating screw; 26. Second wedge block; 27. Material handling assembly; 28. Second geared motor; 29. ​​Movable plate; 30. Second hydraulic cylinder; 31. Second mechanical gripper; 32. Mesh plate; 33. Third hydraulic cylinder; 34. Movable groove; 35. Feed conveyor belt; 36. Discharge conveyor belt. Detailed Implementation

[0031] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0032] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the present invention discloses a quenching process for anti-crack mold steel, comprising a quenching furnace body 1. The quenching furnace body 1 has symmetrically arranged inlet 2 and outlet 3. Both the inlet 2 and outlet 3 of the quenching furnace body 1 are provided with sealing plates 4 for sealing the inlet 2 and outlet 3. The inlet 2 of the quenching furnace body 1 is provided with a quenching feeding mechanism 5 for feeding the anti-crack mold steel to be quenched into the quenching furnace body 1. The outlet 3 of the quenching furnace body 1 is provided with a quenching unloading mechanism 6 for removing the quenched anti-crack mold steel from the quenching furnace body 1. A cold treatment chamber 7 is located outside the quenching furnace body 1, directly below the quenching unloading mechanism 6. When quenching the mold steel, the sealing plate at the inlet 2 of the quenching furnace body 1 is opened. Plate 4 and quenching feeding mechanism 5 feed the anti-crack mold steel to be quenched into the interior of quenching furnace body 1 through feed port 2 for heating. The cover plate 4 at feed port 2 is closed. After heating for a period of time, the cover plate 4 at discharge port 3 is opened. Quenching material removal mechanism 6 takes out the quenched mold steel from the interior of quenching furnace body 1 through discharge port 3 and sends it into the interior of cold treatment box 7 for cooling. This facilitates the feeding of the anti-crack mold steel to be quenched into the interior of quenching furnace body 1 for heating treatment, and also facilitates the taking out of the quenched anti-crack mold steel from the discharge port 3 of quenching furnace body 1 and sending it into the interior of cold treatment box 7 for cooling treatment. This avoids the current situation where the mold steel needs to be heated for a period of time and then clamped out and sent into the cooling water tank, which affects the heat treatment efficiency of the mold steel.

[0033] The top of the quenching furnace body 1 is provided with a lifting mechanism 8 for driving the cover plate 4 to open or close. The lifting mechanism 8 includes a push plate 9 located at the top of the cover plate 4. An electric push rod 10 for driving the push plate 9 to move up and down is installed at the top of the quenching furnace body 1. A sliding cavity 11 matching the cover plate 4 is provided on the quenching furnace body 1. When the cover plate 4 is closed, the output shaft of the electric push rod 10 moves the electric push plate 9 downward, and the push plate 9 drives the cover plate 4 to move downward to seal the feed port 2 or the discharge port 3.

[0034] The feed inlet 2 and the discharge outlet 3 are provided with T-shaped grooves 12 on both sides, and the cover plate 4 is provided with sliders 13 on both sides that match the grooves 12. When the cover plate 4 moves, the sliders 13 move inside the grooves 12, which improves the stability of the cover plate 4.

[0035] The quenching feeding mechanism 5 includes a feeding seat 14 located at the inlet 2 of the quenching furnace body 1. The bottom end of the feeding seat 14 has a first wedge-shaped groove 15. A first reciprocating screw 16 is located inside the first wedge-shaped groove 15. A first wedge-shaped block 17, matching and sliding with the first wedge-shaped groove 15, is threaded onto the first reciprocating screw 16. A first reduction motor 18, which drives the first reciprocating screw 16, is installed at the end of the feeding seat 14. The bottom end of the first wedge-shaped block 17 has a gripping assembly 19 for gripping the anti-crack mold steel to be quenched. The gripping assembly 19 includes a mounting base 20 located at the bottom end of the first wedge-shaped block 17. A vertically downward first hydraulic cylinder 21 is mounted at the bottom end of the mounting base 20. The output of the first hydraulic cylinder 21... The shaft is equipped with a first mechanical gripper 22. When the mold steel is fed into the quenching furnace body 1, the cover plate 4 of the feed port 2 is opened. The output shaft of the first hydraulic cylinder 21 pushes the first mechanical gripper 22 downward. The first mechanical gripper 22 grabs the mold steel. The output shaft of the first hydraulic cylinder 21 is reset. The output shaft of the first reduction motor 18 drives the first reciprocating screw 16 to rotate. The rotation of the first reciprocating screw 16 meshes with the first wedge block 17, causing the first wedge block 17 to move along the direction of the first wedge groove 15. The first wedge block 17 drives the feeding seat 14 to move. The feeding seat 14 drives the first hydraulic cylinder 21 and the first mechanical gripper to move, thereby feeding the mold steel grabbed by the first mechanical gripper 22 into the interior of the quenching furnace body 1 for heating.

[0036] The quenching material handling mechanism 6 includes a material handling seat 23 located at the discharge port 3 of the quenching furnace body 1. A second wedge-shaped groove 24 is provided at the bottom end of the material handling seat 23. A second reciprocating screw 25 is provided inside the second wedge-shaped groove 24. A second wedge-shaped block 26, matching and sliding with the second wedge-shaped groove 24, is threaded onto the second reciprocating screw 25. A material handling assembly 27 for removing the quenched anti-crack mold steel is provided at the bottom end of the material handling seat 23. A second reduction motor 28 for driving the second reciprocating screw 25 to rotate is installed on the material handling seat 23. The material handling assembly 27 includes a movable plate 29 located at the bottom end of the second wedge-shaped block 26. A vertically downward second hydraulic cylinder 30 is installed at the bottom end of the movable plate 29. The bottom end of the second hydraulic cylinder 30 is provided with… When the second mechanical gripper 31 removes the quenched mold steel from the interior of the quenching furnace body 1, it opens the cover plate 4 at the discharge port 3. The output shaft of the second reduction motor 28 drives the second reciprocating screw 25 to rotate. The second reciprocating screw 25 meshes with the second wedge block 26, causing the second wedge block 26 to move along the direction of the second wedge groove 24. The second wedge block 26 drives the movable plate 29 to extend from the discharge port 3 into the interior of the quenching furnace body 1. The output shaft of the second hydraulic cylinder 30 moves downward, and the second mechanical gripper 31 grips the quenched mold steel. The movable plate 29 sends the gripped mold steel out from the interior of the quenching furnace body 1, thus facilitating the removal of the quenched mold steel from the quenching furnace body 1 and its placement into the cold treatment chamber 7.

[0037] The cold treatment chamber 7 is equipped with a mesh plate 32 inside. The material receiving seat 23 is equipped with a third hydraulic cylinder 33 on both sides to drive the mesh plate 32. The inner wall of the cold treatment chamber 7 is provided with movable grooves 34 on both sides. The mesh plate 32 is provided with movable shafts that match the movable grooves 34 on both sides. The end of the cold treatment chamber 7 away from the quenching furnace body 1 is provided with a notch, which can lift the cooled anti-crack mold steel from the cold treatment chamber 7 and tilt the mesh plate 32 to send the mold steel out through the notch.

[0038] The quenching furnace body 1 is provided with a feeding conveyor belt 35 at the feeding port 2, and a discharge conveyor belt 36 is provided at one end of the cold treatment box body 7 near the notch. The feeding conveyor belt 35 facilitates feeding, and the discharge conveyor belt 36 facilitates the discharge of the heat-treated mold steel.

[0039] The quenching process steps are as follows:

[0040] a. The feeding conveyor belt 35 moves the anti-crack mold steel to be quenched, opens the cover plate 4 at the feed port 2, the first mechanical gripper 22 grabs the anti-crack mold steel to be quenched, and during the rotation of the first reciprocating screw 16, the gripped anti-crack mold steel to be quenched is fed from the feed port 2 into the interior of the quenching furnace body 1 for heating, the cover plate 4 at the feed port 2 is closed, and the temperature is maintained for a period of time.

[0041] b. Open the cover plate 4 at the discharge port 3, and the second mechanical gripper 31 takes the quenched anti-crack mold steel out of the quenching furnace body 1 and puts it into the mesh plate 32 inside the cold treatment box 7 for cooling treatment.

[0042] c. After cooling for a period of time, the output shaft of the third hydraulic cylinder 33 drives the mesh plate 32 to move upward. The movable shaft on the mesh plate 32 moves upward along the direction of the movable groove 34 until the movable shaft near the end of the notch moves to the end. Then the mesh plate 32 rotates around the movable shaft at this end, causing the mesh plate 32 to tilt and slide the cooled anti-crack mold steel into the interior of the discharge conveyor belt 36.

[0043] During operation, the quenching process for this type of crack-resistant mold steel involves opening the cover plate 4 at the feed port 2 of the quenching furnace body 1. The quenching feeding mechanism 5 feeds the crack-resistant mold steel to be quenched into the interior of the quenching furnace body 1 through the feed port 2 for heating. After heating for a period of time, the cover plate 4 at the discharge port 3 is opened, and the quenching unloading mechanism 6 removes the quenched mold steel from the interior of the quenching furnace body 1 through the discharge port 3 and sends it into the interior of the cold treatment chamber 7 for cooling. This facilitates the feeding of the crack-resistant mold steel to be quenched into the interior of the quenching furnace body 1 for heating treatment, and also facilitates the removal of the quenched crack-resistant mold steel from the discharge port 3 of the quenching furnace body 1 and its transfer to the interior of the cold treatment chamber 7 for cooling treatment. This avoids the current situation where the mold steel needs to be heated for a period of time and then clamped out and sent into the cooling water tank, which affects the heat treatment efficiency of the mold steel.

[0044] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A crack-proof die steel quenching apparatus comprising a quenching furnace body (1), characterized in that, The quenching furnace body (1) is symmetrically provided with an inlet (2) and an outlet (3), the inlet (2) and the outlet (3) of the quenching furnace body (1) are respectively provided with a cover plate (4) for sealing the inlet (2) and the outlet (3), the inlet (2) of the quenching furnace body (1) is provided with a quenching feeding mechanism (5) for feeding the anti-crack die steel to be quenched into the quenching furnace body (1), the outlet (3) of the quenching furnace body (1) is provided with a quenching taking-out mechanism (6) for taking out the quenched anti-crack die steel from the quenching furnace body (1), and the quenching furnace body (1) is externally provided with a cold treatment box (7) located directly below the quenching taking-out mechanism (6). The top end of the quenching furnace body (1) is provided with a lifting mechanism (8) for driving the cover plate (4) to open or close, the lifting mechanism (8) comprises a push plate (9) arranged at the top end of the cover plate (4), and the top end of the quenching furnace body (1) is provided with an electric push rod (10) for driving the push plate (9) to lift, and the quenching furnace body (1) is provided with a sliding cavity (11) matched with the cover plate (4). The inlet (2) and the outlet (3) are respectively provided with a T-shaped sliding groove (12) on both sides, and the cover plate (4) is provided with a sliding block (13) matched with the sliding groove (12) on both sides. The quenching feeding mechanism (5) comprises a feeding seat (14) arranged at the inlet (2) of the quenching furnace body (1), the bottom end of the feeding seat (14) is provided with a first wedge-shaped groove (15), the first wedge-shaped groove (15) is internally provided with a first reciprocating lead screw (16), the first reciprocating lead screw (16) is threadedly connected with a first wedge-shaped block (17) matched with the first wedge-shaped groove (15) for sliding, the end of the feeding seat (14) is provided with a first speed reducer motor (18) for driving the first reciprocating lead screw (16) to rotate, and the bottom end of the first wedge-shaped block (17) is provided with a grabbing assembly (19) for grabbing the anti-crack die steel to be quenched.

2. A quenching device for a crack-resistant mold steel according to claim 1, characterized in that, The grabbing assembly (19) comprises a mounting seat (20) arranged at the bottom end of the first wedge-shaped block (17), the bottom end of the mounting seat (20) is provided with a first hydraulic cylinder (21) vertically downward, and the output shaft of the first hydraulic cylinder (21) is provided with a first mechanical gripper (22).

3. A quenching device for a crack-resistant mold steel according to claim 1, characterized in that, The quenching taking-out mechanism (6) comprises a taking-out seat (23) arranged at the outlet (3) of the quenching furnace body (1), the bottom end of the taking-out seat (23) is provided with a second wedge-shaped groove (24), the second wedge-shaped groove (24) is internally provided with a second reciprocating lead screw (25), the second reciprocating lead screw (25) is threadedly connected with a second wedge-shaped block (26) matched with the second wedge-shaped groove (24) for sliding, the bottom end of the taking-out seat (23) is provided with a taking-out assembly (27) for taking out the quenched anti-crack die steel, and the taking-out seat (23) is provided with a second speed reducer motor (28) for driving the second reciprocating lead screw (25) to rotate.

4. A quenching device for a crack-resistant mold steel according to claim 3, characterized in that, The taking-out assembly (27) comprises a movable plate (29) arranged at the bottom end of the second wedge block (26), the bottom end of the movable plate (29) is provided with a vertically downward second hydraulic cylinder (30), and the bottom end of the second hydraulic cylinder (30) is provided with a second mechanical grabber (31).

5. A quenching device for a crack-resistant mold steel according to claim 4, characterized in that, The inside of the cold treatment box body (7) is provided with a net-shaped plate (32), the two sides of the taking-out seat (23) are both provided with a third hydraulic cylinder (33) for driving the net-shaped plate (32) to move, the two sides of the inner wall of the cold treatment box body (7) are both provided with a movable groove (34), the two sides of the net-shaped plate (32) are both provided with a movable shaft matched with the movable groove (34), and the end of the cold treatment box body (7) away from the quenching furnace body (1) is provided with a gap.

6. A quenching apparatus for a crack-resistant mold steel according to claim 5, wherein The quenching furnace body (1) is provided with an inlet conveying belt (35) at the inlet (2), and the end of the cold treatment box body (7) close to the gap is provided with a discharge conveying belt (36).

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