Vacuum gas nitriding furnace suitable for workpieces with various surface states

Abstract

This utility model relates to the field of metal material heat treatment technology, and in particular to a vacuum gas nitriding furnace adaptable to workpieces with various surface conditions. It includes a support base, a nitriding chamber, a cleaning chamber, and a sealing door. The nitriding chamber is fixedly connected to the top of the support base, and the cleaning chamber is fixedly connected to the top of the nitriding chamber. Both the nitriding chamber and the cleaning chamber have slots at their bottoms. The sealing door is rotatably connected to the front of the cleaning chamber. This utility model uses an electric push rod to drive the working frame to rise and fall, achieving vertical transfer of the workpiece between the cleaning chamber and the nitriding chamber, improving the stability and positioning accuracy of the equipment. Furthermore, the vacuum environment of the cleaning chamber and the nitriding chamber are independently controlled by a first vacuum pump and a second vacuum pump, respectively. In conjunction with a pulse vacuum cleaning module installed in the cleaning chamber, the workpiece surface is rinsed using periodic gas filling and vacuuming, effectively removing dust, moisture, and volatile contaminants, creating favorable conditions for subsequent deep cleaning and consistent nitriding treatment.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment technology for metal materials, and in particular to a vacuum gas nitriding furnace that is adaptable to workpieces with various surface conditions. Background Technology

[0002] Gas nitriding is an important metal surface strengthening process. Under specific temperature and atmospheric conditions, nitrogen is diffused into the workpiece surface to form a nitrided layer with high hardness, wear resistance, and fatigue resistance. It is widely used in the heat treatment of molds, gears, shaft parts, and precision mechanical components. Vacuum gas nitriding furnaces, as key equipment for this process, offer advantages such as a pure atmosphere, precise temperature control, minimal deformation, and environmental friendliness, making them a primary method for high-end nitriding treatments.

[0003] However, in actual production, the workpieces to be treated often come from different previous processes, with varying degrees of residual oil or oxides on their surfaces. This leads to defects such as uneven nitriding layer, slow nitriding speed, loose surface, and even peeling when treating workpieces with trace amounts of contaminants on their surfaces. Existing equipment mostly uses a single vacuuming and nitrogen circulation method in the vacuum extraction and cleaning stages, which has limited ability to remove surface-adsorbed impurities. Especially when processing batches of mixed workpieces with varying surface conditions, it is difficult to guarantee consistent nitriding initiation conditions.

[0004] Therefore, it is necessary to design a vacuum gas nitriding furnace that can adapt to workpieces with various surface conditions to solve the above problems. Utility Model Content

[0005] To overcome the shortcomings of inconsistent workpiece surface conditions and difficulty in ensuring consistent nitriding, this utility model provides a vacuum gas nitriding furnace that is adaptable to workpieces with various surface conditions.

[0006] The technical implementation scheme of this utility model is as follows: A vacuum gas nitriding furnace adaptable to workpieces with various surface conditions includes a support base, a nitriding chamber, a cleaning chamber, a sealing door, a handle, an electric push rod, a working frame, a first vacuum pump, a pulse vacuum cleaning module, a plasma cleaning module, a second vacuum pump, a mounting block, and a nitriding gas supply module. The nitriding chamber is fixedly connected to the top of the support base, and the cleaning chamber is fixedly connected to the top of the nitriding chamber. Both the nitriding chamber and the cleaning chamber have slots at their bottoms. The sealing door is rotatably connected to the front side of the cleaning chamber, and a handle is fixedly connected to the left side of the front side of the sealing door. An electric push rod is installed on the top inner side of the support base, and the telescopic rod at the top of the electric push rod is fixedly connected to the working frame, which corresponds to the two slots. The first vacuum pump is installed on the upper right side of the cleaning chamber, the pulse vacuum cleaning module is installed on the lower right side of the cleaning chamber, the plasma cleaning module is installed on the left side of the cleaning chamber, and the second vacuum pump is installed on the left side of the nitriding chamber. The mounting block is fixedly connected to the right side of the support base, and the nitriding gas supply module is fixedly connected to the left side of the mounting block, and the nitriding gas supply module is connected to the nitriding chamber.

[0007] Furthermore, it also includes a sealing ring, with a sealing ring provided on the rear edge of the sealing door.

[0008] Furthermore, it also includes a motor and a worktable. The motor is fixedly connected to the middle of the inner side of the work frame, and the output shaft at the top of the motor is fixedly connected to the worktable. The worktable is rotatably connected to the work frame, and the outer perimeter of the worktable is smaller than the opening of the cleaning chamber.

[0009] Furthermore, it also includes placement frames and magnetic blocks. Multiple placement frames are placed on the top of the worktable, and each placement frame has a magnetic block at its bottom, which is attached to the worktable.

[0010] Furthermore, it also includes a connecting rod and a partition. A connecting rod is fixedly connected to the middle of the top of the workbench, and a partition is fixedly connected to the top of the connecting rod. The partition can be adapted to the size of the opening at the bottom of the cleaning chamber.

[0011] Furthermore, it also includes a heating frame and a heater. The heating frame is fixedly connected to the bottom of the nitriding chamber, and the heater is provided inside the heating frame.

[0012] Beneficial effects: 1. This utility model uses an electric push rod to drive the working frame to rise and fall, realizing the vertical transfer of the workpiece between the cleaning chamber and the nitriding chamber, which improves the stability and positioning accuracy of the equipment operation. Furthermore, the vacuum environment of the cleaning chamber and the nitriding chamber are independently controlled by the first vacuum pump and the second vacuum pump, respectively. In conjunction with the pulse vacuum cleaning module set in the cleaning chamber, the workpiece surface is flushed by periodic gas inflation and vacuuming, effectively removing dust, water vapor and volatile pollutants, creating good conditions for the consistency of subsequent deep cleaning and nitriding treatment.

[0013] 2. This utility model accurately supplies ammonia or other nitriding gases through a nitriding gas supply module, and works in conjunction with a heater to ensure that the nitrided layer has high hardness and good density, meeting the surface strengthening requirements of various workpieces. Then, the worktable is rotated by a motor, so that the workpiece is uniformly heated and in contact with nitriding gas during the nitriding process, avoiding local overheating or uneven nitriding, and ensuring that workpieces with different surface conditions obtain consistent nitriding quality.

[0014] 3. This utility model physically isolates the cleaning chamber from the nitriding chamber through the cooperation of the partition and the connecting rod, and then uses the magnetic block to attract and fix the metal worktable to make the placement frame stable and fixed, which facilitates the simultaneous clamping and replacement of multiple workpieces, prevents workpiece displacement during processing, and improves the convenience and safety of operation. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2This is a three-dimensional structural diagram of the support base, nitriding chamber, and cleaning chamber of this utility model.

[0017] Figure 3 This is a three-dimensional structural diagram of the sealing door, sealing ring, and handle of this utility model.

[0018] Figure 4 This is a three-dimensional sectional view of the components of this utility model, including the electric push rod, the working frame, and the worktable.

[0019] Figure 5 This is a three-dimensional cross-sectional view of the components of this utility model, including the motor, heating frame, and heater.

[0020] Reference numerals: 1-Support base, 2-Nitriding chamber, 3-Cleaning chamber, 4-Sealed door, 5-Sealing ring, 6-Handle, 7-Electric push rod, 8-Working frame, 9-Motor, 10-Workbench, 11-Placement frame, 12-Magnetic block, 13-Connecting rod, 14-Baffle, 15-First vacuum pump, 16-Pulse vacuum cleaning module, 17-Plasma cleaning module, 18-Heating frame, 19-Heater, 20-Second vacuum pump, 21-Mounting block, 22-Nitriding gas supply module. Detailed Implementation

[0021] Example: A vacuum gas nitriding furnace adaptable to workpieces with various surface conditions, such as... Figures 1-5 As shown, the system includes a support base 1, a nitriding chamber 2, a cleaning chamber 3, a sealing door 4, a handle 6, an electric push rod 7, a working frame 8, a first vacuum pump 15, a pulse vacuum cleaning module 16, a plasma cleaning module 17, a second vacuum pump 20, a mounting block 21, and a nitriding gas supply module 22. The nitriding chamber 2 is fixedly connected to the top of the support base 1, and the cleaning chamber 3 is fixedly connected to the top of the nitriding chamber 2. Both the nitriding chamber 2 and the cleaning chamber 3 have slots at their bottoms, with the slots in the nitriding chamber 2 and the cleaning chamber 3 corresponding vertically. A sealing door 4 is rotatably connected to the front of the cleaning chamber 3, and a handle 6 is fixedly connected to the left side of the front of the sealing door 4. An electric push rod 7 is bolted to the bottom of the support base 1, and the telescopic end of the electric push rod passes upward through the support base 1. The telescopic rod of the electric push rod 7 can penetrate into the nitriding chamber 2; the end of the telescopic rod of the electric push rod 7 is fixedly connected to a working frame 8, the working frame 8 corresponds vertically to the slot of the nitriding chamber 2 and the slot of the cleaning chamber 3, and the working frame 8 can move up and down in the nitriding chamber 2 and the cleaning chamber 3 through the slot of the nitriding chamber 2 and the slot of the cleaning chamber 3. A first vacuum pump 15 is installed on the upper right side of the cleaning chamber 3, a pulse vacuum cleaning module 16 is installed on the lower right side of the cleaning chamber 3, a plasma cleaning module 17 is installed on the left side of the cleaning chamber 3, a second vacuum pump 20 is installed on the left side of the nitriding chamber 2, an installation block 21 is welded to the right side of the support base 1, and a nitriding gas supply module 22 is fixedly connected to the left side of the installation block 21 by bolts, and the nitriding gas supply module 22 is connected to the nitriding chamber 2.

[0022] like Figure 3 As shown, it also includes a sealing ring 5, and the sealing door 4 has a sealing ring 5 on its rear edge.

[0023] like Figure 2 , Figure 4 and Figure 5 As shown, it also includes a motor 9 and a worktable 10. The motor 9 is fixedly connected to the middle of the inner side of the work frame 8 by bolts. The output shaft at the top of the motor 9 is fixedly connected to the worktable 10. The worktable 10 is rotatably connected to the work frame 8, and the outer perimeter of the worktable 10 is smaller than the slot of the cleaning chamber 3.

[0024] like Figure 2 , Figure 4 and Figure 5 As shown, it also includes a placement frame 11 and a magnetic block 12. Multiple placement frames 11 are placed on the top of the workbench 10, and each placement frame 11 is provided with a magnetic block 12 at the bottom. The magnetic block 12 is attached to the workbench 10.

[0025] like Figure 2 , Figure 4 and Figure 5 As shown, it also includes a connecting rod 13 and a partition 14. The connecting rod 13 is fixedly connected to the top center of the workbench 10, and the partition 14 is fixedly connected to the top of the connecting rod 13. The partition 14 can be adapted to the size of the slot opened at the bottom of the cleaning chamber 3, thereby sealing the slot at the bottom of the cleaning chamber 3.

[0026] like Figure 4 and Figure 5 As shown, it also includes a heating frame 18 and a heater 19. The heating frame 18 is fixedly connected to the bottom of the inner side of the nitriding chamber 2, and the heater 19 is provided inside the heating frame 18.

[0027] When this device is needed to perform vacuum gas nitriding treatment on workpieces with various surface conditions, first start the electric push rod 7. The telescopic rod at the top of the push rod is pushed upward, causing the working frame 8 to rise vertically along the slot at the bottom of the nitriding chamber 2 and the cleaning chamber 3. This allows the worktable 10 and the workpiece to enter the cleaning chamber 3 and complete the positioning. Then, open the sealing door 4 on the front side of the cleaning chamber 3. Pull the handle 6 to open the sealing door 4 around the pivot. The sealing ring 5 then detaches from the sealing surface. Place the workpieces to be treated into the multiple placement frames 11 on the worktable 10. The bottom of the placement frame 11 has a magnetic block 12, which can firmly adhere to the metal worktable 10 to prevent movement. Workpieces with different surface conditions can be loaded at the same time without sorting. After closing the sealing door 4, the sealing ring 5 is pressed between the sealing door 4 and the cleaning chamber 3 to ensure the cavity is sealed.

[0028] Next, start the first vacuum pump 15 to evacuate the cleaning chamber 3 to a certain vacuum level, and then start the pulse vacuum cleaning module 16. By periodically filling the cleaning chamber 3 with inert gas and then quickly withdrawing the vacuum, the gas flow is used to flush the surface of the workpiece to remove dust, water vapor and some volatile oil stains. This process can be repeated multiple times to ensure preliminary cleaning. After the preliminary cleaning is completed, turn off the pulse vacuum cleaning module 16.

[0029] Next, the plasma cleaning module 17 is activated, and oxygen or argon is introduced into a low vacuum environment to generate high-energy plasma. The active particles in the plasma react chemically or physically with the organic matter remaining on the workpiece surface, thoroughly removing stubborn contaminants and activating the surface to improve the adhesion of the subsequent nitriding layer. After cleaning, the plasma cleaning module 17 is turned off.

[0030] After pretreatment, the electric push rod 7 is activated to drive the working frame 8 to descend and reset, allowing the workpiece to enter the nitriding chamber 2. During the descent, the partition 14 descends together with the connecting rod 13, positioned at the opening of the cleaning chamber, thus isolating the cleaning chamber and the nitriding chamber. Then, the second vacuum pump 20 is activated to evacuate the nitriding chamber 2 to a high vacuum state. Next, the nitriding gas supply module 22 is activated to introduce ammonia or other nitriding gases into the nitriding chamber 2. During the nitriding process, the heater 19 is activated to heat the nitriding chamber 2, causing the ammonia to decompose into active nitrogen atoms, which penetrate into the surface of the workpiece to form a hard nitriding layer. At the same time, the motor 9 is activated, driving the worktable 10 to rotate slowly, ensuring that the workpiece is heated evenly and the atmosphere is fully covered in the heating and gas supply environment, avoiding local overheating or uneven nitriding, and adapting to workpieces with various surface conditions.

[0031] After nitriding is completed, turn off heater 19, motor 9 and nitriding gas supply module 22, then start electric push rod 7 to raise its telescopic rod, sending work frame 8, worktable 10 and workpiece to cleaning chamber 3, open sealing door 4, take out workpiece, and place frame 11 can be taken out and placed as needed to complete the entire nitriding process.

Claims

1. A vacuum gas nitriding furnace adaptable to workpieces with various surface conditions, characterized in that it includes: The system includes a support base (1), a nitriding chamber (2), a cleaning chamber (3), a sealing door (4), a handle (6), an electric push rod (7), a working frame (8), a first vacuum pump (15), a pulse vacuum cleaning module (16), a plasma cleaning module (17), a second vacuum pump (20), a mounting block (21), and a nitriding gas supply module (22). The top of the support base (1) is fixedly connected to the nitriding chamber (2), and the top of the nitriding chamber (2) is fixedly connected to the cleaning chamber (3). Both the nitriding chamber (2) and the cleaning chamber (3) have slots at their bottoms. The front of the cleaning chamber (3) is rotatably connected to the sealing door (4), and the left side of the front of the sealing door (4) is fixedly connected to the handle (6). An electric push rod (7) is installed on the top inner side of the support (1). The telescopic rod at the top of the electric push rod (7) is fixedly connected to the working frame (8). The working frame (8) corresponds to the two slots. A first vacuum pump (15) is installed on the upper right side of the cleaning chamber (3). A pulse vacuum cleaning module (16) is installed on the lower right side of the cleaning chamber (3). A plasma cleaning module (17) is installed on the left side of the cleaning chamber (3). A second vacuum pump (20) is installed on the left side of the nitriding chamber (2). An installation block (21) is fixedly connected to the right side of the support (1). A nitriding gas supply module (22) is fixedly connected to the left side of the installation block (21), and the nitriding gas supply module (22) is connected to the nitriding chamber (2).

2. A vacuum gas nitriding furnace adapted to workpieces with various surface conditions as described in claim 1, characterized in that, It also includes a sealing ring (5), and the sealing door (4) has a sealing ring (5) on its rear edge.

3. A vacuum gas nitriding furnace adapted to workpieces with various surface conditions as described in claim 2, characterized in that, It also includes a motor (9) and a worktable (10). The motor (9) is fixedly connected to the middle of the inner side of the work frame (8). The output shaft of the motor (9) is fixedly connected to the worktable (10). The worktable (10) is rotatably connected to the work frame (8), and the outer periphery of the worktable (10) is smaller than the slot of the cleaning chamber (3).

4. A vacuum gas nitriding furnace adapted to workpieces with various surface conditions as described in claim 3, characterized in that, It also includes a placement frame (11) and a magnetic block (12). Multiple placement frames (11) are placed on the top of the workbench (10), and each placement frame (11) has a magnetic block (12) at the bottom. The magnetic block (12) is attached to the workbench (10).

5. A vacuum gas nitriding furnace adapted to workpieces with various surface conditions according to claim 4, characterized in that, It also includes a connecting rod (13) and a partition (14). The connecting rod (13) is fixedly connected to the top center of the workbench (10), and the partition (14) is fixedly connected to the top of the connecting rod (13). The partition (14) can be adapted to the size of the slot opened at the bottom of the cleaning chamber (3).

6. The vacuum gas nitriding furnace according to claim 5, wherein It also includes a heating frame (18) and a heater (19). The heating frame (18) is fixedly connected to the bottom of the inner side of the nitriding chamber (2), and the heater (19) is provided inside the heating frame (18).

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