Ion nitriding heat treatment device and process for industrial pure iron

Abstract

The present invention discloses an ion nitriding heat treatment device for industrial pure iron and a process thereof, and relates to the technical field of metal workpiece processing. The present invention comprises a nitriding furnace, an air injection pump and a mounting frame, wherein a fixed plate and a supporting rotary plate are arranged in the mounting frame, both of which are rotated with the mounting frame, and a reciprocating screw is arranged in the nitriding furnace, and is driven and matched with a driving motor. In the present invention, the ion nitriding treatment device is provided with a rotatable fixed plate and a supporting rotary plate in the mounting frame, and a driving motor is used to simultaneously drive the clamped workpiece and the reciprocating screw in the nitriding furnace, so that the air nozzle can reciprocately spray ammonia on the rotating workpiece surface during glow heating, so that the nitriding treatment is more uniform and thorough; by improving the original ion nitriding process, further narrowing and reducing the control range of the working gas pressure, and extending the heat preservation time, the ion nitriding treatment process of the pure iron material workpiece can be made more thorough, uniform, and gentle, and the strength of the workpiece is further increased.

Description

Technical Field

[0001] The invention belongs to the technical field of metal workpiece processing, and in particular relates to an ion nitriding heat treatment device and a process thereof for industrial pure iron DT4E. Background Art

[0002] Since metal products have high thermoplasticity, various heat treatment methods are often used in industrial production to strengthen metal workpieces in order to achieve target characteristics; among them, ion nitriding heat treatment process is widely used in the processing of steel workpieces; ion nitriding, as a method of strengthening the metal surface, uses the glow discharge phenomenon to bombard the surface of parts with nitrogen ions generated after ionizing nitrogen-containing gas to heat and nitride the surface to obtain an ion chemical heat treatment process of the surface nitriding layer. It is widely used in cast iron, carbon steel, alloy steel, stainless steel and titanium alloy. After the parts are treated with ion nitriding, the hardness of the material surface can be significantly improved, making them have high wear resistance, fatigue strength, corrosion resistance and burn resistance.

[0003] For example, in the comparative document (CN 106893969 B), an ion nitriding heat treatment process for FV520B material is combined with aging heat treatment to shorten the entire treatment process while meeting the requirements of high strength, corrosion resistance, and wear resistance, and at the same time, the core strength and hardness are high, and the bearing capacity and fatigue life of the workpiece are significantly improved. However, in actual production, there are still some defects. For example, this treatment method has a small scope of application and can only meet the processing of FV520B materials. For the processing of workpieces with high material purity requirements, it is difficult to ensure its due quality; especially for DT4E pure iron materials, it is more necessary to make its surface uniform and thorough ion nitriding heat treatment; and the existing processes and equipment are far from achieving our goals. Therefore, in order to solve the above problems, we design an ion nitriding heat treatment device and process for industrial pure iron. Summary of the invention

[0004] The purpose of the present invention is to provide an ion nitriding heat treatment device and process for industrial pure iron, so as to solve the problems of poor applicability, small application range and uneven nitriding treatment in comparative documents and existing ion nitriding heat treatment processes.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is an ion nitriding heat treatment device for industrial pure iron, comprising a nitriding furnace, an air injection pump and a mounting frame, wherein a feeding port is provided on one side of the nitriding furnace, the mounting frame extends to the inside of the nitriding furnace through the feeding port and is slidably matched with the feeding port; the upper surface of the nitriding furnace is bolted to the air injection pump, and the air injection pump is used to provide dry ammonia for the ion nitriding heat treatment process;

[0007] The mounting frame comprises a supporting grid, a supporting plate and a mounting plate, wherein two opposite sides of the supporting grid are respectively welded to the supporting plate and the mounting plate; a transmission box is bolted to one side of the supporting plate, a driving motor is bolted to the inner surface of the driving box, a fixing plate is bolted to one end surface of the output shaft of the driving motor, a fastening plate is installed inside the mounting frame, a plurality of fastening bolts are bolted between the fastening plate and the fixing plate, and the distance between the fastening plate and the fixing plate can be adjusted by rotating the fastening bolts;

[0008] A driving gear is clamped on the inner surface of the transmission box, and a transmission belt is installed between the rotating shaft of the driving gear and the output shaft of the driving motor; a reciprocating screw is bolted to the inner surface of the nitriding furnace, and a driven gear is welded on one end face of the reciprocating screw and extends to the outside of the nitriding furnace. The positions of the driven gear and the driving gear correspond to each other, and the two cooperate with each other, that is, when the mounting frame carries the workpiece and is pushed into the nitriding furnace, the driving gear meshes with the driven gear, thereby realizing the simultaneous driving of the workpiece and the reciprocating screw to rotate by the driving motor.

[0009] Preferably, a cleaning pool is welded on one side of the nitriding furnace, two baffles are adhered to the upper surface of the cleaning pool, and the two baffles are clamped with the mounting frame.

[0010] Preferably, a supporting rotary plate is installed inside the mounting frame, a connecting shaft is welded on one side of the supporting rotary plate, and the connecting shaft is extended and clamped to the mounting plate; a plurality of clamping plates are welded on the other side of the supporting rotary plate, and the positions of the supporting rotary plate and the fastening plate correspond to each other, and they cooperate with each other to clamp and fix the workpiece.

[0011] Preferably, a wire sleeve is meshed on the side surface of the reciprocating screw, and a plurality of air nozzles are adhered to the lower surface of the wire sleeve. The air nozzles are interconnected with the inside of the wire sleeve, so that when the driving motor drives the workpiece and the reciprocating screw to rotate simultaneously, the wire sleeve and the air nozzle slide back and forth on the surface of the reciprocating screw, making the jet heating more uniform.

[0012] Preferably, a ventilation pipe is bolted to one surface of the air injection pump, the ventilation pipe is a hose structure, and one end surface is connected to the silk sleeve by bolting.

[0013] Preferably, the two opposite inner surfaces of the nitriding furnace are provided with slide grooves, and the two opposite side surfaces of the mounting plate are adhered with sliders that slide in cooperation with the slide grooves.

[0014] An ion nitriding heat treatment process for industrial pure iron. The process is for a pure iron workpiece. First, surface cleaning treatment and solid solution treatment are performed, and then ion nitriding heat treatment is performed. The process includes the following steps:

[0015] Step 1: Surface cleaning and solution treatment: The workpiece to be treated is fixed in the mounting frame, and the workpiece is clamped and fixed by the fastening plate and the supporting rotary plate; a weak acid solution is sprayed on the surface of the workpiece with a spray device for cleaning, mainly used to remove rust and other solidified impurities on the surface of the workpiece, and a brush can be used for brushing during this period;

[0016] Step 2, ion nitriding heat treatment: push the mounting frame into the nitriding furnace, place the cleaned workpiece at the heat treatment station, and ensure that the driving gear is meshed with the driven gear. The driving motor can be used to drive the workpiece and the reciprocating screw to rotate at the same time, so that the painting heating process is more uniform, and the support plate is used to seal the feeding port; after evacuating the interior of the nitriding furnace, dry ammonia is introduced to perform glow discharge heating;

[0017] Step 3: Insulation treatment: After the temperature in the furnace rises to a stable level after glow discharge heating, the insulation stage begins. The ammonia flow, working voltage, current and working gas pressure are controlled respectively. After 28-32 hours of insulation, the temperature is lowered to 200℃ and air-cooled before being taken out of the furnace.

[0018] Preferably, the internal gas pressure of the nitriding furnace is less than 10Pa; the ammonia flow rate in the insulation stage is 1.5-2.0L / min, the working voltage is 600-850V, the current is 20-30A, and the working gas pressure is 300-400Pa.

[0019] The present invention has the following beneficial effects:

[0020] 1. The ion nitriding treatment device of the present invention is provided with a rotatable fixed plate and a supporting rotating plate in the mounting frame, and uses a driving motor to simultaneously drive the clamped workpiece and the reciprocating screw in the nitriding furnace, so that the air nozzle can reciprocately spray ammonia gas on the surface of the rotating workpiece during glow heating, so that the nitriding treatment is more uniform and thorough;

[0021] 2. By improving the original ion nitriding process, further narrowing and reducing the control range of the working gas pressure and extending the insulation time, the ion nitriding process of the DT4E pure iron material workpiece can be made more thorough, uniform and gentle, further increasing the strength of the workpiece.

[0022] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of an ion nitriding heat treatment device for industrial pure iron according to the present invention;

[0025] Figure 2 It is a top view of an ion nitriding heat treatment device for industrial pure iron according to the present invention;

[0026] Figure 3 for Figure 2 Structural diagram of the middle section AA;

[0027] Figure 4 for Figure 3 A partial display of part B in the middle;

[0028] Figure 5 for Figure 3 Schematic diagram of the structure of CC in the middle section.

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0030] 1. Nitriding furnace; 2. Air injection pump; 3. Mounting frame; 101. Feeding port; 301. Supporting grid; 302. Supporting plate; 303. Mounting plate; 304. Transmission box; 305. Driving motor; 3051. Fixing plate; 3052. Fastening plate; 3053. Fastening bolt; 3041. Driving gear; 3042. Transmission belt; 102. Reciprocating screw; 1021. Driven gear; 103. Cleaning tank; 1031. Baffle; 306. Supporting rotary plate; 3061. Clamping plate; 104. Wire sleeve; 1041. Air nozzle; 201. Ventilation pipe; 105. Slide; 3031. Sliding block. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0033] See also Figure 1-5As shown, the present invention is an ion nitriding heat treatment device for industrial pure iron, comprising a nitriding furnace 1, an air injection pump 2 and a mounting frame 3. A feeding port 101 is provided on one side of the nitriding furnace 1, and the mounting frame 3 extends to the inside of the nitriding furnace 1 through the feeding port 101 and is slidably matched with the feeding port 101; the upper surface of the nitriding furnace 1 is bolted to the air injection pump 2, and the air injection pump 2 is used to provide dry ammonia for the ion nitriding heat treatment process;

[0034] The mounting frame 3 includes a supporting grid 301, a supporting plate 302 and a mounting plate 303, wherein two opposite sides of the supporting grid 301 are welded to the supporting plate 302 and the mounting plate 303 respectively; a transmission box 304 is bolted to one side of the supporting plate 302, a driving motor 305 is bolted to the inner surface of the driving box 304, a fixing plate 3051 is bolted to one end surface of the output shaft of the driving motor 305, a fastening plate 3052 is installed inside the mounting frame 3, a plurality of fastening bolts 3053 are bolted between the fastening plate 3052 and the fixing plate 3051, and the distance between the fastening plate 3052 and the fixing plate 3051 can be adjusted by rotating the fastening bolts 3053;

[0035] A driving gear 3041 is clamped on the inner surface of the transmission box 304, and a transmission belt 3042 is installed between the rotating shaft of the driving gear 3041 and the output shaft of the driving motor 305; a reciprocating screw 102 is bolted to the inner surface of the nitriding furnace 1, and a driven gear 1021 is welded on one end face of the reciprocating screw 102 and extends to the outside of the nitriding furnace 1, and the positions of the driven gear 1021 and the driving gear 3041 correspond to each other, and the two cooperate with each other, that is, when the mounting frame 3 carries the workpiece and is pushed into the nitriding furnace 1, the driving gear 3041 is meshed with the driven gear 1021, thereby realizing that the workpiece and the reciprocating screw 102 are driven to rotate at the same time by the driving motor 305.

[0036] Preferably, a cleaning pool 103 is welded on one side of the nitriding furnace 1 , and two baffles 1031 are adhered to the upper surface of the cleaning pool 103 , and the two baffles 1031 are clamped with the mounting frame 3 .

[0037] Preferably, a supporting rotary plate 306 is installed inside the mounting frame 3, a connecting shaft is welded on one side of the supporting rotary plate 306, and the connecting shaft is extended and clamped to the mounting plate 303; a plurality of clamping plates 3061 are welded on the other side of the supporting rotary plate 306, and the positions of the supporting rotary plate 306 and the fastening plate 3052 correspond to each other, and they cooperate with each other to clamp and fix the workpiece.

[0038] Preferably, a wire sleeve 104 is meshed with the side surface of the reciprocating screw 102, and a plurality of air nozzles 1041 are adhered to the lower surface of the wire sleeve 104. The air nozzles 1041 are interconnected with the inside of the wire sleeve 104, so that when the drive motor 305 drives the workpiece and the reciprocating screw 102 to rotate simultaneously, the wire sleeve 104 and the air nozzles 1041 slide back and forth on the surface of the reciprocating screw 102, making the jet heating more uniform.

[0039] Preferably, a ventilation pipe 201 is bolted to one surface of the air injection pump 2 . The ventilation pipe 201 is a hose structure, and one end surface is bolted to the silk sleeve 104 for communication.

[0040] Preferably, two opposite inner surfaces of the nitriding furnace 1 are provided with slide grooves 105 , and two opposite side surfaces of the mounting plate 303 are adhered with sliders 3031 , which are slidably matched with the slide grooves 105 .

[0041] An ion nitriding heat treatment process for industrial pure iron. This process is for DT4E pure iron material workpieces. First, surface cleaning treatment and solid solution treatment are performed, and then ion nitriding heat treatment is performed. The process includes the following steps:

[0042] Step 1: Surface cleaning and solution treatment: The workpiece to be treated is mounted and fixed in the mounting frame 3, and the workpiece is clamped and fixed by the fastening plate 3052 and the supporting rotary plate 306; a weak acid solution is then sprayed on the surface of the workpiece by a spray device for cleaning, mainly for removing rust and other solidified impurities on the surface of the workpiece, and a brush can be used for brushing during the process;

[0043] Step 2, ion nitriding heat treatment: push the mounting frame 3 into the nitriding furnace 1, place the cleaned workpiece at the heat treatment station, and ensure that the driving gear 3041 is meshed with the driven gear 1021, and the driving motor 305 can be used to drive the workpiece and the reciprocating screw 102 to rotate simultaneously, so that the painting heating process is more uniform, and the support plate 302 is used to seal the feed port 101; after evacuating the interior of the nitriding furnace 1, dry ammonia is introduced to perform glow discharge heating;

[0044] Step 3: Insulation treatment: After the temperature in the furnace rises to a stable level after glow discharge heating, the insulation stage begins. The ammonia flow, working voltage, current and working gas pressure are controlled respectively. After 28-32 hours of insulation, the temperature is lowered to 200℃ and air-cooled before being taken out of the furnace.

[0045] Preferably, the internal gas pressure of the nitriding furnace 1 is less than 10Pa; the ammonia flow rate in the insulation stage is 1.5-2.0L / min, the working voltage is 600-850V, the current is 20-30A, and the working gas pressure is 300-400Pa.

[0046] Embodiment 1:

[0047] See also Figure 1-5 As shown, the model of the drive motor 305 in the present invention is a YSZ80-4-0.8kw soft start motor. In actual operation, the speed of the drive motor 305 should be controlled at 30-60r / min so as to cooperate with the jet assembly to perform uniform nitriding treatment on the surface of the workpiece; in addition, the ion nitriding device of the present invention is externally connected to a microcomputer, a vacuum pump device and a discharge device, which are mainly used to maintain and monitor the entire process in real time.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An ion nitriding heat treatment device for industrial pure iron, comprising a nitriding furnace (1), an air injection pump (2) and a mounting frame (3), characterized in that: A feeding port (101) is provided on one side of the nitriding furnace (1); the mounting frame (3) extends into the interior of the nitriding furnace (1) through the feeding port (101) and is slidably matched with the feeding port (101); the upper surface of the nitriding furnace (1) is bolted to the gas injection pump (2); The mounting frame (3) comprises a supporting grid (301), a supporting plate (302) and a mounting plate (303); the supporting grid (301) is welded to the supporting plate (302) and the mounting plate (303) at two opposite sides; a transmission box (304) is bolted to one side of the supporting plate (302); a driving motor (305) is bolted to the inner surface of the driving box (304); a fixing plate (3051) is bolted to one end surface of the output shaft of the driving motor (305); a fastening plate (3052) is installed inside the mounting frame (3); a plurality of fastening bolts (3053) are bolted between the fastening plate (3052) and the fixing plate (3051); A driving gear (3041) is clamped on the inner surface of the transmission box (304), and a transmission belt (3042) is installed between the rotating shaft of the driving gear (3041) and the output shaft of the driving motor (305); a reciprocating screw (102) is bolted on the inner surface of the nitriding furnace (1), and a driven gear (1021) is welded on one end face of the reciprocating screw (102) and extends to the outside of the nitriding furnace (1), and the positions of the driven gear (1021) and the driving gear (3041) correspond to each other, and the two cooperate with each other; a supporting rotary plate (306) is installed inside the mounting frame (3), and a connecting shaft is welded on one side of the supporting rotary plate (306) and extends to be clamped to the mounting plate (303); a plurality of clamping plates (3061) are welded on the other side of the supporting rotary plate (306), and the positions of the supporting rotary plate (306) and the fastening plate (3052) correspond to each other; The reciprocating screw (102) is meshed with a wire sleeve (104) on the side surface thereof, and a plurality of air nozzles (1041) are adhered to the lower surface of the wire sleeve (104), and the air nozzles (1041) are interconnected with the inside of the wire sleeve (104); a ventilation pipe (201) is bolted to one surface of the air injection pump (2), and the ventilation pipe (201) is a hose structure, and one end surface is bolted to the wire sleeve (104).

2. The ion nitriding heat treatment device for industrial pure iron according to claim 1, characterized in that: A cleaning pool (103) is welded to one side of the nitriding furnace (1), and two baffles (1031) are adhered to the upper surface of the cleaning pool (103), and the two baffles (1031) are clamped to the mounting frame (3).

3. The ion nitriding heat treatment device for industrial pure iron according to claim 1, characterized in that: The nitriding furnace (1) is provided with slide grooves (105) on two opposite inner surfaces, and the mounting plate (303) is adhered with sliders (3031) on two opposite side surfaces, and is slidably matched with the slide grooves (105).

4. An ion nitriding heat treatment process for industrial pure iron based on the ion nitriding heat treatment device according to any one of claims 1 to 3, characterized in that: This process is aimed at DT4E pure iron material workpieces, firstly performing surface cleaning treatment and solution treatment, and then performing ion nitriding heat treatment, including the following steps: Step 1, surface cleaning treatment and solution treatment: install and fix the workpiece to be treated in the mounting frame (3), and use the fastening plate (3052) and the supporting rotary plate (306) to clamp and fix the workpiece; then use a spray device to spray a weak acid solution on the surface of the workpiece for cleaning; Step 2, ion nitriding heat treatment: push the mounting frame (3) to the inside of the nitriding furnace (1), so that the cleaned workpiece is placed in the heat treatment station, and at the same time use the support plate (302) to seal the feed port (101); after evacuating the inside of the nitriding furnace (1), dry ammonia gas is introduced to perform glow discharge heating; Step 3, insulation treatment: after the temperature in the furnace rises to a stable level after glow discharge heating, the insulation stage begins, and the ammonia flow rate, working voltage, current and working gas pressure are controlled respectively. After insulation for 28-32 hours, the temperature is reduced to 200°C and the furnace is air-cooled.

5. The ion nitriding heat treatment process for industrial pure iron according to claim 4, characterized in that: The internal gas pressure of the nitriding furnace (1) is less than 10Pa; the ammonia flow rate in the insulation stage is 1.5-2.0L / min, the working voltage is 600-850V, the current is 20-30A, and the working gas pressure is 300-400Pa.

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