Composite nitriding device for surface modification of No.45 steel gear

Abstract

The utility model discloses a compound nitriding device for surface modification of a No.45 steel gear, and relates to the technical field of heat treatment, the compound nitriding device comprises a heating furnace, a placing assembly is arranged in the heating furnace, the placing assembly comprises a silk screen plate, three placing frames are fixedly arranged on the silk screen plate, each placing frame is provided with a hanging rod, and the hanging rods are connected with the heating furnace. The gear is subjected to hard nitriding treatment, the surface hardness of the gear can be improved, when the gear needs to be subjected to tufftriding treatment, the mixed atmosphere of ammonia gas and alcohol is input into the heating furnace from the mixed gas inlet pipe and heated to 510 DEG C for 20 hours, and the nitriding speed is increased by performing tufftriding treatment on the gear, so that the nitriding efficiency is improved. And the product quality is ensured, the loss is reduced, and the production efficiency is improved by carrying out two stage grouping tests of hard nitriding and tufftriding on the product and then carrying out measurement and inspection.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment, in particular to a composite nitriding device used for surface modification of 45# steel gears. Background Art

[0002] The oil pump driving gear is made of 45 steel. The gear processing process is: forging → tempering → machining → nitriding → oil seal storage. The main heat treatment technology of the gear requires the tempering hardness to be 25-30HRC, the surface hardness after nitriding treatment to be ≥480HV10, the compound layer to be ≥10μm, and the depth of the nitriding layer to be ≥0.35mm.

[0003] In recent years, the gear nitriding has been treated with ion nitriding (nitriding temperature 510±10℃, nitriding time 24-36 hours). However, due to equipment reasons and gear dimensions, the nitriding layer is uneven after nitriding - the depth of the nitriding layer gradually decreases from the tooth tip to the tooth root, and the hardness of the core of some gears decreases after nitriding - the hardness after quenching and tempering is 100% tested to be 28-30HRC, and the hardness of the core of some gears after nitriding drops to 23, 24HRC, resulting in scrapping and serious losses. In response to the above problems, we propose a composite nitriding device for surface modification of 45 steel gears. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides a composite nitriding device for surface modification of No. 45 steel gears, which solves the technical problem of reduced hardness of the core of the gear after nitriding.

[0006] (II) Technical solution

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A composite nitriding device for surface modification of No. 45 steel gears, comprising a heating furnace, wherein a placement assembly is arranged in the heating furnace, wherein the placement assembly comprises a wire mesh plate, wherein three placement racks are fixedly mounted on the wire mesh plate, wherein each of the placement racks is mounted with a hanging rod, wherein each of the hanging rods is used to place gears, wherein a support assembly is arranged in the heating furnace, wherein the support assembly comprises a support plate, wherein two support plates are arranged, wherein two support plates are fixedly mounted in the heating furnace, wherein a gap exists between the two support plates, wherein the wire mesh plate is placed at the upper ends of the two support plates, wherein a stopper is fixedly mounted on one side of the upper end of each of the support plates.

[0009] Preferably: a furnace cover is installed at the port of the heating furnace, an ammonia inlet pipe and a mixed gas inlet pipe are fixedly installed on the heating furnace, and an outlet pipe is fixedly installed at the upper end of the heating furnace.

[0010] Preferably, grooves are provided at both ends of each of the placement racks, and plug blocks are fixedly connected to both ends of each of the hanging rods, and each of the plug blocks is respectively inserted into the grooves.

[0011] (III) Beneficial effects

[0012] 1. When the gear needs to be hard nitrided, ammonia is input into the heating furnace from the ammonia inlet pipe and heated to 510℃ for 8 hours. The surface hardness of the gear can be improved by hard nitriding. When the gear needs to be soft nitrided, a mixed atmosphere of ammonia and alcohol is input into the heating furnace from the mixed gas inlet pipe and heated to 510℃ for 20 hours. The gear is soft nitrided to increase the nitriding speed and ensure the depth of the nitriding layer. The product is grouped in two stages of hard nitriding and soft nitriding, and then measured and inspected to ensure product quality, reduce losses and improve production efficiency.

[0013] Second, both ends of the hanging rod are fixedly connected with plug-in blocks, which are respectively inserted into the grooves. The hanging rod is conveniently installed and disassembled by plugging, so as to facilitate the placement and removal of the gear. The gap between the two support plates makes the bottom of the support plate have a gap, which makes it convenient to place the screen plate on the support plate or remove it from the support plate with tools, making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings.

[0015] Figure 1 This is the overall structural diagram of the composite nitriding device used for surface modification of No. 45 steel gears in the utility model;

[0016] Figure 2 This is a structural diagram of the furnace cover of the utility model;

[0017] Figure 3 This is a structural diagram of the support plate of the utility model;

[0018] Figure 4 This is a structural diagram of the wire mesh plate of the utility model;

[0019] Figure 5 This is an experimental data diagram of the utility model.

[0020] Legend: 1. Heating furnace; 11. Furnace cover; 12. Ammonia inlet pipe; 13. Mixed gas inlet pipe; 14. Exhaust pipe; 2. Wire mesh plate; 21. Placement rack; 22. Groove; 3. Hanging rod; 31. Insert block; 4. Support plate; 41. Stop block. DETAILED DESCRIPTION

[0021] The embodiment of the present application provides a composite nitriding device for surface modification of No. 45 steel gears, which effectively solves the problem of decreased hardness of the core of the gear after nitriding. When the gear needs to be hard nitrided, the composite nitriding device for surface modification of No. 45 steel gears inputs ammonia from the ammonia inlet pipe into the heating furnace and heats to 510°C for 8 hours. By performing hard nitriding on the gear, the surface hardness of the gear can be improved. When the gear needs to be soft nitrided, a mixed atmosphere of ammonia and alcohol is input from the mixed gas inlet pipe into the heating furnace and heated to 510°C for 20 hours. The wheel is soft nitrided to increase the nitriding speed and ensure the depth of the nitriding layer. The product is grouped for hard nitriding and soft nitriding tests, and then measured and inspected to ensure product quality, reduce losses and improve production efficiency. Both ends of the hanging rod are fixedly connected with plug-ins, and the two plug-ins are respectively inserted into the grooves. The plug-in method is adopted to facilitate the installation and disassembly of the hanging rod, thereby facilitating the placement and removal of the gear. The gap between the two support plates makes there a gap at the bottom of the support plate, which is convenient for placing the screen plate on the support plate or removing it from the support plate using tools, making it more convenient to use.

[0022] Embodiment: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the technical solution in the embodiment of the present application effectively solves the technical problem of the decrease in the hardness of the core of the gear after nitriding. The overall idea is as follows:

[0023] In view of the problems existing in the prior art, the utility model provides a composite nitriding device for surface modification of No. 45 steel gears, including a heating furnace 1, a placement assembly is arranged in the heating furnace 1, the placement assembly includes a wire mesh plate 2, three placement racks 21 are fixedly installed on the wire mesh plate 2, each placement rack 21 is installed with a hanging rod 3, each hanging rod 3 is used to place a gear, a supporting assembly is arranged in the heating furnace 1, the supporting assembly includes a supporting plate 4, the number of the supporting plates 4 is two, the two supporting plates 4 are fixedly installed in the heating furnace 1, there is a gap between the two supporting plates 4, the wire mesh plate 2 is placed between the two supporting plates 4, and the wire mesh plate 2 is placed between the two supporting plates 4. The upper end of the plate 4, a stopper 41 is fixedly installed on one side of the upper end of each support plate 4, a furnace cover 11 is installed at the port of the heating furnace 1, an ammonia inlet pipe 12 and a mixed gas inlet pipe 13 are fixedly installed on the heating furnace 1, and an outlet pipe 14 is fixedly installed on the upper end of the heating furnace 1. Grooves 22 are provided at both ends of each placement rack 21, and plug blocks 31 are fixedly connected at both ends of each hanging rod 3. Each plug block 31 is respectively inserted into the groove 22. When processing the gears, firstly, a plurality of gears are sleeved on each hanging rod 3, and then the plug blocks 31 at both ends of the hanging rod 3 are respectively inserted into the groove 22 to complete the processing. The gear is placed in a limited position. At this time, the wire mesh plate 2 is placed on the upper ends of the two support plates 4 in the heating furnace 1, and the furnace cover 11 is closed to seal the heating furnace 1. When the gear needs to be hard nitrided, ammonia is input into the heating furnace 1 from the ammonia inlet pipe 12, and heated to 510°C for 8 hours. By hard nitriding the gear, the surface hardness of the gear can be improved. When the gear needs to be soft nitrided, a mixed atmosphere of ammonia and alcohol is input into the heating furnace 1 from the mixed gas inlet pipe 13, and heated to 510°C for 20 hours. By soft nitriding the gear, the nitriding speed is increased. , to ensure the depth of the penetration layer, the product is tested in two stages, hard nitriding and soft nitriding, and then measured and inspected to ensure product quality, reduce losses and improve production efficiency. Both ends of the hanging rod 3 are fixedly connected with plug blocks 31, and the two plug blocks 31 are respectively inserted into the grooves 22. The hanging rod 3 is conveniently installed and disassembled by plug-in, so as to facilitate the placement and removal of the gear. There is a gap between the two support plates 4, so that there is a gap at the bottom of the support plate 4, which is convenient for using tools to place the screen plate 2 on the support plate 4 or remove it from the support plate 4, which is more convenient to use;

[0024] A method for using a composite nitriding device for surface modification of a No. 45 steel gear comprises the following steps:

[0025] S1: Put the gear on the hanging rod 3 and put it into the heating furnace;

[0026] S2: Ammonia gas is introduced and heated to 510°C for 8 hours to perform hard nitriding treatment on the gears;

[0027] S3: A mixed atmosphere of ammonia and alcohol is heated to 510℃ for 20 hours to perform soft nitriding treatment on the gears.

[0028] Working principle:

[0029] The first step is to process the gears. First, several gears are sleeved on each hanging rod 3, and then the plugs 31 at both ends of the hanging rod 3 are respectively inserted into the grooves 22 to complete the placement limit of the gears. At this time, the wire mesh plate 2 is placed on the upper ends of the two support plates 4 in the heating furnace 1, and the furnace cover 11 is closed to seal the heating furnace 1. When the gears need to be hard nitrided, ammonia is input into the heating furnace 1 from the ammonia inlet pipe 12, and heated to 510°C for 8 hours. By hard nitriding the gears, the surface hardness of the gears can be improved. When the gears need to be soft nitrided, a mixed atmosphere of ammonia and alcohol is input into the heating furnace 1 from the mixed gas inlet pipe 13, and heated to 510°C for 20 hours. By soft nitriding the gears, the nitriding speed is increased and the depth of the nitriding layer is ensured. The products are grouped in two stages of hard nitriding and soft nitriding, and then measured and inspected to ensure product quality, reduce losses and improve production efficiency.

[0030] In the second step, both ends of the hanging rod 3 are fixedly connected with plug blocks 31, and the two plug blocks 31 are respectively inserted into the grooves 22. The hanging rod 3 is conveniently installed and disassembled by plugging, so as to facilitate the placement and removal of the gear. The gap between the two support plates 4 makes there a gap at the bottom of the support plate 4, which is convenient for placing the screen plate 2 on the support plate 4 or removing it from the support plate 4 with tools, and it is more convenient to use.

[0031] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A composite nitriding device for surface modification of No. 45 steel gears, comprising a heating furnace (1), characterized in that: A placement component is provided in the heating furnace (1), the placement component comprising a wire mesh plate (2), three placement racks (21) are fixedly mounted on the wire mesh plate (2), each of the placement racks (21) is mounted with a hanging rod (3), and each of the hanging rods (3) is used to place a gear; Wherein, a support assembly is arranged in the heating furnace (1), and the support assembly comprises a support plate (4). The number of the support plates (4) is two, and the two support plates (4) are fixedly installed in the heating furnace (1). There is a gap between the two support plates (4), and the wire mesh plate (2) is placed on the upper ends of the two support plates (4).

2. The composite nitriding device for surface modification of No. 45 steel gear according to claim 1, characterized in that: A furnace cover (11) is installed at the port of the heating furnace (1).

3. The composite nitriding device for surface modification of No. 45 steel gear according to claim 1, characterized in that: An ammonia gas inlet pipe (12) and a mixed gas inlet pipe (13) are fixedly mounted on the heating furnace (1).

4. The composite nitriding device for surface modification of No. 45 steel gear according to claim 1, characterized in that: An air outlet pipe (14) is fixedly mounted on the upper end of the heating furnace (1).

5. The composite nitriding device for surface modification of No. 45 steel gear according to claim 1, characterized in that: Both ends of each of the placement racks (21) are provided with grooves (22).

6. The composite nitriding device for surface modification of No. 45 steel gear according to claim 5, characterized in that: Both ends of each hanging rod (3) are fixedly connected with an insert block (31).

7. The composite nitriding device for surface modification of No. 45 steel gear according to claim 6 is characterized in that: Each of the insert blocks (31) is inserted into the groove (22) respectively.

8. The composite nitriding device for surface modification of No. 45 steel gear according to claim 1, characterized in that: A stopper (41) is fixedly mounted on one side of the upper end of each support plate (4).

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