Metal surface low-temperature nitriding strengthening method and equipment based on plasma catalysis

Abstract

The invention relates to the technical field of metal surface treatment, and discloses metal surface low-temperature nitriding strengthening equipment based on plasma catalysis, which comprises a nitriding furnace body and a furnace seat, the nitriding furnace body is arranged above the furnace seat, the nitriding furnace body is provided with an air inlet, a hanging ring and a ladder stand, and the surface of the nitriding furnace body is also provided with an observation window. According to the nitriding device, the placing mechanism is arranged, a workpiece is placed on the placing frame, a clamping assembly in the overturning frame is matched with a pushing assembly to clamp the workpiece, in the nitriding process, the overturning assembly can drive the workpiece to overturn, and the lifting assembly can drive the supporting frame to move, so that overturning is convenient; after the workpiece is overturned, the supporting frame is reset for supporting, meanwhile, the clamping assembly loosens clamping of the workpiece, at the moment, the shielding end, making contact with the containing part originally, of the shaft workpiece is exposed, the shielded part can directly receive active nitrogen species in plasma, insufficient local nitriding is reduced, and it is ensured that the workpiece is subjected to comprehensive nitriding.

Description

Technical Field

[0001] This invention relates to the field of metal surface treatment technology, specifically to a method and equipment for low-temperature nitriding strengthening of metal surfaces based on plasma catalysis. Background Technology

[0002] Plasma-catalyzed low-temperature nitriding strengthening of metal surfaces is a surface modification process that combines plasma technology with catalysis. It can achieve metal surface nitriding at low temperatures of 200-450℃. Its core principle is: in a low-pressure vacuum environment, nitrogen-containing plasma (such as N2, NH3, etc. ionized gas) is generated by glow discharge. The catalyst (such as transition metal compounds, rare earth elements) promotes the generation and adsorption of active nitrogen species (N*, NH2*, etc.) in the plasma, accelerating the diffusion of nitrogen atoms to the metal surface (such as steel, titanium alloys), forming a nitride layer with high hardness and excellent wear resistance (such as Fe4N, CrN). Nowadays, plasma nitriding furnaces are often used in the low-temperature nitriding process to achieve the above-mentioned process, thereby strengthening the metal surface and improving its wear resistance, corrosion resistance and fatigue strength. This process is widely used in automotive parts, molds, aerospace components and other fields.

[0003] In existing plasma nitriding furnaces, the workpiece is typically placed on a placement plate, which acts as the cathode. Due to the structural characteristics of shaft-type workpieces, one end must be directly placed on the surface of the placement plate for positioning. This completely blocks the end area of ​​the workpiece in contact with the placement plate. Nitrogen ions mainly act on the exposed surface of the workpiece through glow discharge, while the end blocked by the placement plate cannot directly receive the bombardment of plasma, making it difficult for nitrogen atoms to penetrate effectively. This results in incomplete nitriding of the entire workpiece surface, affecting the overall nitriding strengthening effect of the workpiece.

[0004] Therefore, we propose a method and equipment for low-temperature nitriding strengthening of metal surfaces based on plasma catalysis. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a method and apparatus for low-temperature nitriding strengthening of metal surfaces based on plasma catalysis. This solves the problem that in existing methods, the end region of the workpiece in contact with the placement plate is completely blocked, and the blocked end cannot directly receive the bombardment of plasma, making it difficult for nitrogen atoms to penetrate effectively. This results in incomplete nitriding of the entire workpiece surface, affecting the overall nitriding strengthening effect of the workpiece.

[0006] (II) Technical Solution To achieve the above objectives, the present invention is implemented through the following technical solution: a low-temperature nitriding strengthening device for metal surfaces based on plasma catalysis, comprising a nitriding furnace body and a furnace base, wherein the nitriding furnace body is located above the furnace base, and the nitriding furnace body is provided with an air inlet, a lifting ring and a ladder, and an observation window is also provided on the surface of the nitriding furnace body; a vacuum suction pipe is provided on the furnace base, and a placement mechanism is provided on the furnace base; The placement mechanism includes an insulating seat installed on a furnace base, a cathode seat installed above the insulating seat, a plurality of symmetrically arranged hollow tubes fixedly connected to the surface of the cathode seat, two auxiliary seats fixedly connected to the hollow tubes, and a support frame for supporting the workpiece slidably connected to the inner walls of the auxiliary seats and the cathode seat. A plurality of flipping frames are rotatably connected to the inner wall of the hollow tubes, and the surface of the flipping frame is provided with a circular hole larger than the diameter of the workpiece. The flipping frame is located above the support frame. The inner wall of the flipping frame is provided with a clamping assembly for clamping and positioning the workpiece. A pushing assembly is provided between the furnace base and the cathode base for controlling the operation of the clamping assembly to achieve clamping. A flipping assembly is provided between the furnace base and the cathode base for controlling the flipping frame to flip the clamped workpiece. A lifting assembly is provided between the cathode base and the support frame for controlling the movement of the support frame to facilitate workpiece flipping.

[0007] Preferably, the clamping assembly includes a movable frame slidably connected to the inner wall of the flipping frame. Multiple sets of symmetrically arranged trapezoidal blocks are fixedly connected to the surface of the movable frame. Multiple sets of clamping rods for clamping workpieces are slidably connected to the inner wall of the flipping frame, with two rods in each set. An auxiliary rod is fixedly connected to one end of each clamping rod. An auxiliary hole is provided on the surface of each trapezoidal block, and the auxiliary rod is located within the auxiliary hole. A top rod is rotatably connected to one end of the movable frame. One end of the top rod passes through the flipping frame and extends out to connect with the pushing assembly. Through these components, during clamping, the pushing assembly can drive one end of the top rod, which in turn drives the movable frame and multiple trapezoidal blocks to move synchronously. The auxiliary hole on the surface of the trapezoidal block, in conjunction with the auxiliary rod on the surface of the clamping rod, can drive the clamping rod to move, thereby realizing the workpiece clamping operation.

[0008] Preferably, the clamping end of the clamping rod is arc-shaped.

[0009] Preferably, the pushing assembly includes a trapezoidal seat slidably connected to the inner wall of the cathode seat. Multiple connecting plates are fixedly connected to the surface of the trapezoidal seat. Each connecting plate is fixedly connected to one end of a push rod. An insulating push rod is slidably connected to the inner wall of the furnace seat. A guide hole is provided on the surface of the trapezoidal seat. The insulating push rod is inserted into the guide hole. A cylinder is mounted on the lower surface of the furnace seat. The output end of the cylinder penetrates the furnace seat, and the output end is connected to the penetration portion of the furnace seat using a sealed structure. The output end of the cylinder is fixedly connected to the insulating push rod. Through these components, when pushing, the cylinder drives the insulating push rod to move. The insulating push rod, in conjunction with the guide hole on the surface of the trapezoidal seat, can control the movement of the trapezoidal seat and multiple connecting plates, thereby realizing the pushing of the push rod.

[0010] Preferably, the flipping assembly includes a gear fixed to the surface of the flipping frame, an insulating plate two is slidably connected to the inner wall of the cathode seat, a plurality of racks are fixedly connected to the surface of the insulating plate two, the racks mesh with the gear, a cylinder two is installed below the furnace seat, the output end of the cylinder two penetrates the furnace seat, and the output end and the penetration part of the furnace seat are connected by a sealed structure, the output end of the cylinder two is fixedly connected to the surface of the insulating plate two. Through the above components, when rotation is required, the cylinder two is opened, the cylinder two drives the insulating plate two to move, the insulating plate two drives the racks to move, the racks cooperate with the gear to drive the flipping frame to rotate, and the flipping frame drives the clamped workpiece to flip.

[0011] Preferably, the lifting assembly includes multiple rods slidably connected to the inner wall of the cathode seat. The rods are fixedly connected to multiple support frames. An insulating plate is fixedly connected to the lower end of the multiple rods. A cylinder is installed on the lower surface of the furnace seat. The output end of the cylinder penetrates the furnace seat, and the output end is connected to the penetration part of the furnace seat with a sealed structure. The output end of the cylinder is fixedly connected to the insulating plate. Through the above components, during the flipping process, the cylinder first drives the insulating plate and the rods to move. The rods can drive the support frames to move downward, losing support for the workpiece, so that the workpiece can be flipped normally.

[0012] Preferably, the surface of the support frame has multiple through holes, and through the above-mentioned components, the through holes on the surface of the support frame are further reduced from being blocked.

[0013] Preferably, the flipping frame is composed of a cylindrical rod and multiple square blocks fixed on the cylindrical rod, and the circular holes on the surface of the flipping frame are provided on the square blocks.

[0014] Preferably, a stabilizing device is provided between the nitriding furnace body and the furnace base. The stabilizing device includes multiple guide sleeves fixed to the surface of the nitriding furnace body, and multiple guide rods slidably connected to the inner wall of the furnace base. The guide rods are inserted into the inner wall of the guide sleeves, and a return spring is sleeved on the surface of the guide rod. The two ends of the return spring are fixedly connected to the guide rod and the surface of the furnace base, respectively. Through the above components, when the nitriding furnace body is assembled with the furnace base, the guide rods can be inserted into the guide sleeves for guidance. When the furnace body moves to a certain position, the guide sleeve pushes the guide rod to move, and the return spring is stressed. When the two are separated, the return spring can drive the guide rod to move with the guide sleeve, thereby resetting the guide rod and ensuring the stability of the hoisting when separated.

[0015] A method for using a plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces includes the following steps: Step 1: First, use the lifting equipment and lifting rings to move the nitriding furnace body upward. The stabilizing device can provide stable guidance to ensure stability during lifting. After moving it away, place the shaft workpiece on the placement rack through the round hole on the surface of the flipping frame. Then, the clamping assembly clamps the workpiece. After clamping, return the nitriding furnace body to the furnace base, perform vacuuming, and introduce gas for nitriding treatment. Step 2: During the process, when it is necessary to flip the workpiece, the multiple support frames of the lifting assembly move downwards and lose contact with the lower end of the workpiece. Then, the flipping assembly drives the flipping frame and the clamped workpiece to flip. After flipping 180 degrees, the lifting assembly drives the support frame to reset and support the workpiece. At the same time, the clamping assembly releases the clamp, and the blocked parts can be nitrided to ensure that the workpiece can be fully nitrided and improve the strengthening effect. Step 3: After the nitriding process is completed, the nitriding furnace body is moved upward using a lifting device and lifting rings. The stabilizing device can provide stable guidance to ensure stability during lifting, and then the nitrided workpiece can be removed.

[0016] In summary, the technical effects and advantages of this invention are as follows: 1. In this invention, by setting up a placement mechanism, the workpiece is placed on the placement rack, and the clamping component in the flipping rack cooperates with the pushing component to clamp the workpiece. During the nitriding process, the flipping component can drive the workpiece to flip, and the lifting component can drive the support frame to move to facilitate flipping. After flipping, the support frame resets to provide support, and at the same time, the clamping component releases its grip on the workpiece. At this time, the shielded end of the shaft workpiece that was originally in contact with the placement part is exposed. The shielded part can directly receive active nitrogen species in the plasma, reducing local nitriding insufficiency and ensuring that the workpiece is fully nitrided.

[0017] 2. In this invention, by setting a stabilizing device, the guide sleeve and guide rod cooperate with the return spring to provide guidance and buffer when the nitriding furnace body is hoisted and opened. Especially when hoisting, the return spring can drive the guide rod to contact and abut against the inner wall of the guide sleeve in real time, reducing the shaking and collision of the nitriding furnace body during hoisting, and improving the safety of equipment operation and workpiece loading and unloading.

[0018] 3. In this invention, the top rod and the moving frame in the clamping assembly are rotatably connected, and the pushing assembly can continue to push during the flipping process.

[0019] 4. In this invention, the lifting component can drive multiple sets of support frames to move down and detach from the workpiece, and then the flipping component drives the rotating frame to rotate, reducing the scratches caused by friction between the workpiece and the support frame when flipping; after flipping, the support frame promptly resets to support the workpiece and ensure overall stability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to the present invention.

[0021] Figure 2 This is a schematic diagram of the exploded structure of the plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to the present invention.

[0022] Figure 3 This is a partial cross-sectional schematic diagram of the plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to the present invention.

[0023] Figure 4 This invention relates to a plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces. Figure 3 Schematic diagram of the structure at point A in the middle.

[0024] Figure 5 This is a schematic diagram of the placement mechanism of the plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to the present invention.

[0025] Figure 6 This is a cross-sectional view of the placement mechanism of the plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to the present invention.

[0026] Figure 7 This is a schematic cross-sectional view of the flipping frame of the plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to the present invention.

[0027] Figure 8 This invention relates to a plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces. Figure 7 Schematic diagram of the structure at point B.

[0028] Figure 9This is a schematic diagram of the clamping component of the plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to the present invention.

[0029] In the diagram: 1. Nitriding furnace body; 2. Furnace base; 3. Ladder; 4. Lifting ring; 5. Air inlet; 6. Vacuum suction pipe; 7. Observation window; 8. Placement mechanism; 81. Insulating base; 82. Cathode base; 83. Hollow tube; 84. Auxiliary base; 85. Support frame; 86. Lifting assembly; 861. Rod; 862. Insulating plate one; 863. Cylinder one; 87. Tilting assembly; 871. Cylinder two; 872. Insulating plate... Plate 2; 873, rack; 874, gear; 88, push assembly; 881, cylinder 3; 882, trapezoidal seat; 883, connecting plate; 884, insulating push rod; 89, clamping assembly; 891, top rod; 892, moving frame; 893, trapezoidal block; 894, clamping rod; 895, auxiliary rod; 810, flipping frame; 9, stabilizing device; 91, guide sleeve; 92, guide rod; 93, return spring. Detailed Implementation

[0030] 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.

[0031] refer to Figure 1 - Figure 9 The plasma-catalyzed low-temperature nitriding strengthening equipment for metal surfaces shown includes a nitriding furnace body 1 and a furnace base 2. The nitriding furnace body 1 is located above the furnace base 2. The nitriding furnace body 1 is provided with an air inlet 5, a lifting ring 4 and a ladder 3. The surface of the nitriding furnace body 1 is also provided with an observation window 7. The furnace base 2 is provided with a vacuum suction pipe 6 and a placement mechanism 8. The placement mechanism 8 includes an insulating seat 81 mounted on the furnace base 2. A cathode seat 82 is mounted above the insulating seat 81. Multiple sets of symmetrically arranged hollow tubes 83 are fixedly connected to the surface of the cathode seat 82. Two auxiliary seats 84 are fixedly connected to the hollow tubes 83. Support frames 85 for supporting workpieces are slidably connected to the inner walls of both the auxiliary seats 84 and the cathode seat 82. Multiple flipping frames 810 are rotatably connected to the inner walls of the hollow tubes 83. The surface of each flipping frame 810 has a circular hole larger than the diameter of the workpiece. The flipping frames 810 are positioned above the support frames 85. The surface of the support frames 85 has multiple through holes. 10 is composed of a cylindrical rod and multiple square blocks fixed on the cylindrical rod, and the round holes on the surface of the flipping frame 810 are set on the square blocks; the inner wall of the flipping frame 810 is provided with a clamping assembly 89 for clamping and positioning workpieces; a pushing assembly 88 is provided between the furnace base 2 and the cathode base 82 for controlling the operation of the clamping assembly 89 to achieve clamping; a flipping assembly 87 is provided between the furnace base 2 and the cathode base 82 for controlling the flipping frame 810 to drive the clamped workpiece to flip; a lifting assembly 86 is provided between the cathode base 82 and the support frame 85 for controlling the movement of the support frame 85 to facilitate workpiece flipping.

[0032] Preferably, the clamping assembly 89 includes a movable frame 892 slidably connected to the inner wall of the flipping frame 810. Multiple sets of symmetrically arranged trapezoidal blocks 893 are fixedly connected to the surface of the movable frame 892. Multiple sets of clamping rods 894 for clamping workpieces are slidably connected to the inner wall of the flipping frame 810, with two rods in each set. An auxiliary rod 895 is fixedly connected to one end of the clamping rod 894. An auxiliary hole is opened on the surface of the trapezoidal block 893, and the auxiliary rod 895 is located in the auxiliary hole. A top rod 891 is rotatably connected to one end of the movable frame 892. One end of the top rod 891 passes through the flipping frame 810 and extends out to connect with the pushing assembly 88. The clamping end of the clamping rod 894 is arc-shaped.

[0033] In this embodiment: When clamping, the pushing component 88 can drive one end of the push rod 891, and the push rod 891 drives the moving frame 892 and multiple trapezoidal blocks 893 to move synchronously. The auxiliary holes on the surface of the trapezoidal blocks 893 cooperate with the auxiliary rods 895 on the surface of the clamping rod 894 to drive the clamping rod 894 to move, thereby realizing the workpiece clamping operation.

[0034] The pushing component 88 includes a trapezoidal seat 882 that is slidably connected to the inner wall of the cathode seat 82. Multiple sets of connecting plates 883 are fixedly connected to the surface of the trapezoidal seat 882. The connecting plates 883 are fixedly connected to one end of the push rod 891. An insulating push rod 884 is slidably connected to the inner wall of the furnace seat 2. A guide hole is opened on the surface of the trapezoidal seat 882. The insulating push rod 884 is inserted into the guide hole. A cylinder 881 is installed on the lower surface of the furnace seat 2. The output end of the cylinder 881 passes through the furnace seat 2, and the output end is connected to the through part of the furnace seat 2 with a sealed structure. The output end of the cylinder 881 is fixedly connected to the insulating push rod 884.

[0035] In this embodiment: When pushing, cylinder 881 drives the insulating push rod 884 to move. The insulating push rod 884, in conjunction with the guide hole on the surface of the trapezoidal seat 882, can control the movement of the trapezoidal seat 882 and multiple connecting plates 883, thereby realizing the pushing of the push rod 891.

[0036] The flipping assembly 87 includes a gear 874 fixed on the surface of the flipping frame 810. An insulating plate 872 is slidably connected to the inner wall of the cathode seat 82. Multiple racks 873 are fixedly connected to the surface of the insulating plate 872. The racks 873 mesh with the gear 874. A cylinder 871 is installed below the furnace seat 2. The output end of the cylinder 871 passes through the furnace seat 2, and the output end is connected to the through part of the furnace seat 2 with a sealed structure. The output end of the cylinder 871 is fixedly connected to the surface of the insulating plate 872.

[0037] In this embodiment: when rotation is required, cylinder 2 871 is opened, cylinder 2 871 drives insulating plate 2 872 to move, insulating plate 2 872 drives rack 873 to move, rack 873 cooperates with gear 874 to drive flipping frame 810 to rotate, flipping frame 810 drives the clamped workpiece to flip.

[0038] The lifting assembly 86 includes multiple rods 861 that are slidably connected to the inner wall of the cathode seat 82. The rods 861 are fixedly connected to multiple support frames 85. An insulating plate 862 is fixedly connected to the lower end of the multiple rods 861. A cylinder 863 is installed on the lower surface of the furnace seat 2. The output end of the cylinder 863 passes through the furnace seat 2, and the output end and the through part of the furnace seat 2 are connected by a sealed structure. The output end of the cylinder 863 is fixedly connected to the insulating plate 862.

[0039] In this embodiment: During the flipping process, cylinder 863 first drives insulating plate 862 and rod 861 to move. Rod 861 can drive support frame 85 to move downward, losing support for the workpiece, so that the workpiece can be flipped normally.

[0040] A stabilizing device 9 is provided between the nitriding furnace body 1 and the furnace base 2. The stabilizing device 9 includes multiple guide sleeves 91 fixed on the surface of the nitriding furnace body 1. Multiple guide rods 92 are slidably connected to the inner wall of the furnace base 2. The guide rods 92 are inserted into the inner wall of the guide sleeves 91. A return spring 93 is sleeved on the surface of the guide rods 92. The two ends of the return spring 93 are fixedly connected to the guide rods 92 and the surface of the furnace base 2, respectively.

[0041] In this embodiment: when the nitriding furnace body 1 is assembled with the furnace base 2, the guide rod 92 can be inserted into the guide sleeve 91 for guidance. When it moves to a certain position, the guide sleeve 91 pushes the guide rod 92 to move, and the return spring 93 is stressed. When the two are separated, the return spring 93 can drive the guide rod 92 to move with the guide sleeve 91, thereby driving the guide rod 92 to return to its original position, ensuring the stability of the hoisting when separated.

[0042] The sealing mechanism mentioned above is not shown in the figure. The sealing structure can be an existing sealing structure such as a sealing ring.

[0043] A method for using a plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces includes the following steps: Step 1: First, using the lifting device and lifting ring 4, move the nitriding furnace body 1 upward. The stabilizing device 9 can provide stable guidance to ensure stability during lifting. After the removal is completed, place the shaft workpiece on the placement rack through the round hole on the surface of the flipping frame 810. Then, the clamping assembly 89 clamps the workpiece. After clamping, return the nitriding furnace body 1 to the furnace base 2, perform vacuuming, and introduce gas for nitriding treatment. Step 2: During the process, when flipping is required, the lifting assembly 86 moves the multiple support frames 85 downwards, losing contact with the lower end of the workpiece. Then, the flipping assembly drives the flipping frame 810 and the clamped workpiece to flip. After flipping 180 degrees, the lifting assembly 86 drives the support frames 85 to reset, supporting the workpiece. At the same time, the clamping assembly 89 releases the clamp, and the blocked parts can be nitrided to ensure that the workpiece can be fully nitrided, thus improving the strengthening effect. Step 3: After the nitriding process is completed, the nitriding furnace body 1 is moved upward by using the lifting tool and lifting ring 4. The stabilizing device 9 can provide stable guidance to ensure stability during lifting, and then the nitrided workpiece can be removed.

[0044] Working principle of this invention: During use, the lifting device can first be connected to the lifting ring 4, and then the nitriding furnace body 1 can be lifted upwards. At this time, the nitriding furnace body 1 drives the guide sleeve 91 to move, and the return spring 93 drives the guide rod 92 to follow the movement of the guide sleeve 91 and return to its original position, maintaining a stable effect during lifting. After the nitriding furnace body 1 is lifted and moved away, the user can place the workpiece on the support frame 85 through the round hole on the surface of the flipping frame 810. After all the workpieces are placed, the cylinder 881 drives the insulating push rod 884 to move. The insulating push rod 884 cooperates with the guide hole on the surface of the trapezoidal seat 882 to control the movement of the trapezoidal seat 882 and multiple connecting plates 883, thereby realizing the pushing of the top. Rod 891 and top rod 891 drive the moving frame 892 and multiple trapezoidal blocks 893 to move synchronously. The auxiliary holes on the surface of trapezoidal block 893 cooperate with the auxiliary rods 895 on the surface of clamping rod 894 to drive clamping rod 894 to move, thereby realizing the workpiece clamping operation. After clamping, the nitriding furnace body 1 is lifted back to the furnace base 2 by the lifting device, and then slowly released downward. The guide rod 92 can be inserted into the guide sleeve 91 for guidance. When it moves to a certain position, due to the weight of the nitriding furnace body 1 itself, the guide sleeve 91 pushes the guide rod 92 to move, and the return spring 93 is stressed, merging the nitriding furnace body 1 with the furnace base 2. Then, vacuuming and gas input are performed to carry out the plasma low-temperature nitriding process. During the nitriding process, cylinder 863 can be opened, causing insulating plate 862 and rod 861 to move. Rod 861 can then move multiple support frames 85 downwards, dislodging their support for the workpiece. Simultaneously, cylinder 871 can be opened, causing insulating plate 872 to move. Insulating plate 872 then moves rack 873, which, in conjunction with gear 874, rotates tilting frame 810. Tilting frame 810 tilts the clamped workpiece. After tilting is complete, the cylinder... 863 drives the insulating plate 862 to reset, and the rod 861 drives the support frame 85 to reset, contacting the workpiece and supporting it. After support, the cylinder 881 works, driving the insulating push rod 884 to reset. The insulating push rod 884 drives the trapezoidal seat 882 and the connecting plate 883 to reset, thereby controlling the top rod 891 and the moving frame 892 to reset. The clamping rod 894 loses its grip on the workpiece. At this time, the part of the workpiece that was blocked is no longer blocked, and the nitriding operation is repeated on the workpiece to ensure that the nitriding of the workpiece is complete. After nitriding is completed, the furnace body 1 is lifted upwards by connecting it to the lifting ring 4 again using the lifting device. At this time, the furnace body 1 moves the guide sleeve 91, and the return spring 93 moves the guide rod 92 to return to its original position by following the movement of the guide sleeve 91, thus maintaining a stable effect during lifting. After the nitriding furnace body 1 is lifted and moved away, the workpiece can be picked up.

[0045] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is 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 plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces, comprising a nitriding furnace body (1) and a furnace base (2), characterized in that: The nitriding furnace body (1) is located above the furnace base (2). The nitriding furnace body (1) is provided with an air inlet (5), a lifting ring (4) and a ladder (3). The surface of the nitriding furnace body (1) is also provided with an observation window (7). The furnace base (2) is provided with a vacuum suction pipe (6) and a placement mechanism (8). The placement mechanism (8) includes an insulating seat (81) installed on the furnace base (2), a cathode seat (82) installed above the insulating seat (81), a plurality of symmetrically arranged hollow tubes (83) fixedly connected to the surface of the cathode seat (82), two auxiliary seats (84) fixedly connected to the hollow tubes (83), and a support frame (85) for supporting the workpiece slidably connected to the inner wall of the auxiliary seats (84) and the cathode seat (82), and a plurality of flipping frames (810) rotatably connected to the inner wall of the hollow tubes (83), and a circular hole larger than the diameter of the workpiece is opened on the surface of the flipping frame (810), and the flipping frame (810) is located above the support frame (85); The inner wall of the flipping frame (810) is provided with a clamping assembly (89) for clamping and positioning workpieces. A pushing assembly (88) is provided between the furnace base (2) and the cathode base (82) for controlling the operation of the clamping assembly (89) to achieve clamping. A flipping assembly (87) is provided between the furnace base (2) and the cathode base (82) for controlling the flipping frame (810) to drive the clamped workpiece to flip. A lifting assembly (86) is provided between the cathode base (82) and the support frame (85) for controlling the movement of the support frame (85) to facilitate workpiece flipping.

2. The plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to claim 1, characterized in that: The clamping assembly (89) includes a movable frame (892) that is slidably connected to the inner wall of the flipping frame (810). The surface of the movable frame (892) is fixedly connected to a plurality of symmetrically arranged trapezoidal blocks (893). The inner wall of the flipping frame (810) is slidably connected to a plurality of clamping rods (894) for clamping workpieces, with two in each set. One end of the clamping rod (894) is fixedly connected to an auxiliary rod (895). The surface of the trapezoidal block (893) is provided with an auxiliary hole. The auxiliary rod (895) is located in the auxiliary hole. One end of the movable frame (892) is rotatably connected to a top rod (891). One end of the top rod (891) passes through the flipping frame (810) and extends out to connect with the pushing assembly (88).

3. The plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to claim 2, characterized in that: The clamping end of the clamping rod (894) is arc-shaped.

4. The plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to claim 2, characterized in that: The pushing assembly (88) includes a trapezoidal seat (882) that is slidably connected to the inner wall of the cathode seat (82). Multiple sets of connecting plates (883) are fixedly connected to the surface of the trapezoidal seat (882). The connecting plates (883) are fixedly connected to one end of the top rod (891). An insulating push rod (884) is slidably connected to the inner wall of the furnace seat (2). A guide hole is opened on the surface of the trapezoidal seat (882). The insulating push rod (884) is inserted into the guide hole. A cylinder three (881) is installed on the lower surface of the furnace seat (2). The output end of the cylinder three (881) passes through the furnace seat (2), and the output end is connected to the through part of the furnace seat (2) with a sealed structure. The output end of the cylinder three (881) is fixedly connected to the insulating push rod (884).

5. The plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to claim 1, characterized in that: The flipping assembly (87) includes a gear (874) fixed on the surface of the flipping frame (810). An insulating plate (872) is slidably connected to the inner wall of the cathode seat (82). Multiple racks (873) are fixedly connected to the surface of the insulating plate (872). The racks (873) mesh with the gear (874). A cylinder (871) is installed below the furnace seat (2). The output end of the cylinder (871) passes through the furnace seat (2), and the output end is connected to the furnace seat (2) through the furnace seat (2) with a sealed structure. The output end of the cylinder (871) is fixedly connected to the surface of the insulating plate (872).

6. The low-temperature nitriding strengthening device for metal surfaces based on plasma catalysis according to claim 1, characterized in that: The lifting assembly (86) includes multiple rods (861) that are slidably connected to the inner wall of the cathode seat (82). The rods (861) are fixedly connected to multiple support frames (85). The lower ends of the multiple rods (861) are fixedly connected to an insulating plate (862). A cylinder (863) is installed on the lower surface of the furnace seat (2). The output end of the cylinder (863) passes through the furnace seat (2), and the output end is connected to the furnace seat (2) through a sealed structure. The output end of the cylinder (863) is fixedly connected to the insulating plate (862).

7. The plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces according to claim 1, characterized in that: The surface of the support frame (85) has multiple through holes.

8. The low-temperature nitriding strengthening device for metal surfaces based on plasma catalysis according to claim 1, characterized in that: The flipping frame (810) is composed of a cylindrical rod and multiple square blocks fixed on the cylindrical rod, and the round holes on the surface of the flipping frame (810) are set on the square blocks.

9. The low-temperature nitriding strengthening device for metal surfaces based on plasma catalysis according to claim 1, characterized in that: A stabilizing device (9) is provided between the nitriding furnace body (1) and the furnace base (2). The stabilizing device (9) includes multiple guide sleeves (91) fixed on the surface of the nitriding furnace body (1). Multiple guide rods (92) are slidably connected to the inner wall of the furnace base (2). The guide rods (92) are inserted into the inner wall of the guide sleeves (91). A return spring (93) is sleeved on the surface of the guide rods (92). The two ends of the return spring (93) are fixedly connected to the surfaces of the guide rods (92) and the furnace base (2), respectively.

10. A method of using a plasma-catalyzed low-temperature nitriding strengthening device for metal surfaces as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: First, the nitriding furnace body (1) is moved upward by using the lifting device and lifting ring (4). The stabilizing device (9) can provide stable guidance to ensure stability during hoisting. After the removal is completed, the shaft workpiece is placed on the placement rack through the round hole on the surface of the flipping frame (810). Then the clamping assembly (89) clamps the workpiece. After clamping, the nitriding furnace body (1) is reset back onto the furnace base (2), and a vacuum is drawn. Gas is then introduced for nitriding treatment. S2: During the process, when it is necessary to flip, the multiple support frames (85) of the lifting assembly (86) move downward and lose contact with the lower end of the workpiece. Then, the flipping assembly drives the flipping frame (810) and the clamped workpiece to flip. After flipping 180 degrees, the lifting assembly (86) drives the support frame (85) to reset and support the workpiece. At the same time, the clamping assembly (89) releases the clamp. The blocked parts can be nitrided to ensure that the workpiece can be fully nitrided and improve the strengthening effect. S3: After the nitriding process is completed, the nitriding furnace body (1) is moved upward by using a lifting device and lifting ring (4). The stabilizing device (9) can provide stable guidance to ensure the stability during lifting, and then the nitrided workpiece can be removed.

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