Ferrule nitriding auxiliary device

Abstract

The utility model belongs to the technical field of heat treatment clamps, and particularly relates to a ferrule nitriding auxiliary device which comprises an inner sleeve, the hanging tool is coaxially arranged on the outer side of the inner sleeve, and the hanging tool is used for fixing the ring sleeve; the outer sleeve is coaxially arranged on the outer side of the hanging tool; a gap is reserved between the inner sleeve and the hanger, and a gap is reserved between the hanger and the outer sleeve; and a plurality of round holes are formed in the inner sleeve and the outer sleeve. According to the utility model, glow secondary heating is carried out on the titanium alloy ring sleeve by utilizing the hollow cathode effect of the holes in the inner sleeve and the outer sleeve, so that the nitriding temperature is increased. Meanwhile, the distances between the titanium alloy ring sleeve and the inner sleeve and the outer sleeve are regulated, the temperature of a glow area is controlled, and the nitriding temperature is further regulated. Based on the two strategies, efficient nitriding of the titanium alloy can be finally achieved. The device is simple in structure, low in price, small in occupied area, convenient to disassemble and assemble, low in energy consumption and high in cost performance, the technology is easy to control, and the performance requirement for corrosion resistance or abrasion resistance of local areas of workpieces can be met.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat treatment fixtures, and in particular relates to a ferrule nitriding auxiliary device. Background Art

[0002] Titanium alloys have been widely used in the aerospace field due to their high strength and low density. In recent years, titanium alloy bearings have replaced steel bearings and attracted the attention of the industry. However, titanium alloys have poor wear resistance, which greatly limits their application in titanium alloy bearings. Nitriding technology is an effective strategy to improve the surface hardness and wear resistance of titanium alloys, but the temperature limit of the plasma nitriding furnace is 650°C, which is much lower than the nitriding temperature of titanium alloys (≥900°C). Therefore, conventional plasma nitriding technology for titanium alloys is inefficient, the nitrided layer is thin, and the hardness is low. The wear resistance of the nitrided layer structure is still difficult to meet the aviation industry's requirements for the wear resistance of titanium alloys.

[0003] Therefore, it is necessary to design a ferrule nitriding auxiliary device to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a ferrule nitriding auxiliary device to solve the above problems and achieve the purpose of high-efficiency nitriding of titanium alloy.

[0005] To achieve the above purpose, the utility model provides the following solution: a ferrule nitriding auxiliary device, comprising

[0006] Inner sleeve;

[0007] A hanger, the hanger is coaxially arranged on the outside of the inner sleeve, and the hanger is used to fix the snare;

[0008] An outer jacket, the outer jacket being coaxially arranged on the outside of the hanger;

[0009] There is a gap between the inner sleeve and the hanger, and between the hanger and the outer sleeve;

[0010] A plurality of circular holes are provided on the inner sleeve and the outer sleeve.

[0011] Preferably, the plurality of circular holes are arranged at equal intervals along the circumferential direction and the axial direction of the inner sleeve and the outer sleeve.

[0012] Preferably, a plurality of sample clamps are provided on the hanger, and the sample clamps are used to clamp and fix the snare.

[0013] Preferably, the outer jacket is a bell-type outer jacket.

[0014] Preferably, the diameter of the circular hole is 5 mm-10 mm.

[0015] Preferably, the distance between the inner sleeve and the snare, and between the snare and the outer sleeve is 10 mm-20 mm.

[0016] Compared with the prior art, the utility model has the following advantages and technical effects:

[0017] The utility model utilizes the hollow cathode effect of the holes in the inner sleeve and the outer sleeve to perform glow secondary heating on the titanium alloy ring to increase the nitriding temperature. At the same time, the distance between the titanium alloy ring and the inner sleeve and the outer sleeve is regulated to control the temperature of the glow zone and further regulate the nitriding temperature. Based on the above two strategies, efficient nitriding of titanium alloy can be finally achieved.

[0018] The utility model has a simple structure, low price, easy process control, small footprint, convenient disassembly and assembly, low energy consumption, can meet the corrosion or wear resistance requirements of the local area of ​​the workpiece, and has high cost performance. The method has good application prospects in the surface treatment of titanium alloy bipolar plates for fuel cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor:

[0020] Figure 1 This is the front view of the utility model;

[0021] Figure 2 It is a top view of the utility model;

[0022] Figure 3 It is a three-dimensional diagram of the utility model.

[0023] Among them, 1. inner sleeve; 2. outer sleeve; 3. hanger; 4. round hole; 5. sample clamp; 6. snare. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Reference Figures 1 to 3 As shown, the utility model provides a ferrule nitriding auxiliary device, comprising

[0027] Inner sleeve 1;

[0028] A hanger 3, which is coaxially arranged outside the inner sleeve 1 and is used to fix the snare 6;

[0029] The outer jacket 2 is coaxially arranged on the outside of the hanger 3;

[0030] There is a gap between the inner sleeve 1 and the hanger 3, and between the hanger 3 and the outer sleeve 2;

[0031] A plurality of circular holes 4 are formed on the inner sleeve 1 and the outer sleeve 2 .

[0032] According to a further optimized solution, a plurality of circular holes 4 are arranged at equal intervals along the circumferential direction and the axial direction of the inner sleeve 1 and the outer sleeve 2 .

[0033] According to a further optimized solution, a plurality of sample clamps 5 are provided on the hanger 3 , and the sample clamps 5 are used to clamp and fix the snare 6 .

[0034] The snare 6 is mounted on the hanger 3 via the sample fixture 5 .

[0035] According to a further optimization scheme, jacket 2 is a bell-shaped jacket.

[0036] According to a further optimization scheme, the diameter of the circular hole 4 is 5 mm-10 mm.

[0037] According to a further optimization scheme, the spacing between the inner sleeve 1 and the snare 6 and between the snare 6 and the outer sleeve 2 is 10 mm to 20 mm.

[0038] Embodiment 1:

[0039] The spacing between the inner sleeve 1 and the ring 6, and between the ring 6 and the outer sleeve 2 is 10 mm, the diameter of the circular hole 4 is 5 mm, the plasma nitriding temperature is 550°C, the nitrogen flow rate is 300 sccm, the argon flow rate is 100 sccm, the nitriding bias is -500 V, the duty cycle is 70%, and the nitriding time is 2 h. After nitriding, the depth of the nitriding layer is observed using a scanning electron microscope, and the surface hardness of the nitriding layer is tested using a microhardness tester.

[0040] Embodiment 2:

[0041] The spacing between the inner sleeve 1 and the ring 6 and between the ring 6 and the outer sleeve 2 is 20 mm, the diameter of the circular hole 4 is 10 mm, and the other nitriding parameters are the same as those in Example 1.

[0042] Embodiment 3:

[0043] The spacing between the inner sleeve 1 and the ring 6 and between the ring 6 and the outer sleeve 2 is 12 mm, the diameter of the circular hole 4 is 8 mm, and the other nitriding parameters are the same as those in Example 1.

[0044] Comparative Example 1:

[0045] The spacing between the inner sleeve 1 and the ring 6 and between the ring 6 and the outer sleeve 2 is 8 mm, the diameter of the circular hole 4 is 4 mm, and the other nitriding parameters are the same as those in Example 1.

[0046] Comparative Example 2:

[0047] The spacing between the inner sleeve 1 and the ring 6 and between the ring 6 and the outer sleeve 2 is 22 mm, the diameter of the circular hole 4 is 12 mm, and the other nitriding parameters are the same as those in Example 1.

[0048] Comparative Example 3:

[0049] The spacing between the inner sleeve 1 and the ring 6 and between the ring 6 and the outer sleeve 2 is 12 mm, and the circular hole 4 is not included. The other nitriding parameters are the same as those in Example 1.

[0050] Comparative Example 4:

[0051] No nitriding auxiliary device was used, and the other nitriding parameters were the same as those in Example 1.

[0052]

[0053] Note: “ / ” means non-existence.

[0054] It can be seen from the table that the auxiliary nitriding device can greatly improve the nitriding efficiency (Examples 1-3 and Comparative Example 4), but the nitriding efficiency is also related to the spacing between the inner sleeve 1 and the ring 6, between the ring 6 and the outer sleeve 2, and the aperture of the circular hole 4. When the spacing is between 10mm-20mm and the aperture is between 5mm-10mm, a good nitriding effect can be obtained.

[0055] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the present invention.

Claims

1. A ferrule nitriding auxiliary device, characterized in that: include Inner sleeve (1); A hanger (3), the hanger (3) being coaxially arranged on the outside of the inner sleeve (1), and the hanger (3) being used to fix the snare (6); An outer jacket (2), the outer jacket (2) being coaxially arranged on the outside of the hanger (3); There is a spacing between the inner sleeve (1) and the hanger (3), and between the hanger (3) and the outer sleeve (2); A plurality of circular holes (4) are provided on the inner sleeve (1) and the outer sleeve (2).

2. A ferrule nitriding auxiliary device according to claim 1, characterized in that: The plurality of circular holes (4) are arranged at equal intervals along the circumferential direction and axial direction of the inner sleeve (1) and the outer sleeve (2).

3. A ferrule nitriding auxiliary device according to claim 1, characterized in that: A plurality of sample clamps (5) are arranged on the hanger (3), and the sample clamps (5) are used to clamp and fix the snare (6).

4. A ferrule nitriding auxiliary device according to claim 1, characterized in that: The outer coat (2) is a bell-shaped outer coat.

5. A ferrule nitriding auxiliary device according to claim 1, characterized in that: The diameter of the circular hole (4) is 5 mm-10 mm.

6. A ferrule nitriding auxiliary device according to claim 1, characterized in that: The distance between the inner sleeve (1) and the snare (6), and between the snare (6) and the outer sleeve (2) is 10 mm to 20 mm.

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