Ion nitriding process for parking brake ejector rod of railway vehicle
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A technology of ion nitriding and parking braking, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of air pollution in the production workshop, waste of metal copper resources, low production efficiency, etc., and achieve reduction The defect rate and dimensional deformation are uniform and the effect of small deformation
Inactive Publication Date: 2020-02-11
常州创思普特轨道交通科技有限公司
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The process of this scheme is complicated. Copper plating is performed on the non-nitrided surface, and then the copper plating is polished off, which not only increases the difficulty of the process, but also increases the production cost, resulting in waste of metal copper resources, and the dust generated by grinding will also cause air pollution in the production workshop. Pollution. In addition, the nitrided surface must be protected while the non-nitrided surface is polished. The nitrided surface can only be polished after the non-nitrided surface is polished. The production process is long, the time is long, and the production efficiency is low.
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Embodiment 1）
[0031] The invention relates to an ion nitriding process for a rail vehicle parking brake ejector rod, the steps are as follows:
[0032] a. Before nitriding treatment, blunt the sharp corner of the hole on the brake ejector rod 1;
[0033] b. Put the first protective sleeve 4 on the end of the brake ejector 1 with the internal thread hole 3, and put the second protective sleeve 5 on the other end of the brake ejector 1 with the sealing groove 2;
[0034] c. Put the brake ejector rod 1 covered with the first protective cover 4 and the second protective cover 5 into the nitriding furnace;
[0035] d. In the ion nitriding heating stage, when the temperature of the brake ejector rod 1 rises to 300°C, after 3 hours of heat preservation, the temperature is raised to 540°C±10°C, and the temperature is maintained for 24 to 30 hours for ion nitriding treatment;
[0036] e. After the nitriding is completed, wait for the nitriding furnace to cool down to room temperature naturally, and...
Embodiment 2）
[0039] See Figure 1 to Figure 3 , The present invention has a brake jack 1, one end of the brake jack 1 has an internally threaded hole 3, and the other end has a seal groove 2, and the seal groove 2 is a circumferential seal groove structure. The brake jack 1 has an internally threaded hole 3 and one end is covered with a first protective sleeve 4 , and the brake jack 1 has a sealing groove 2 and one end is covered with a second protective sleeve 5 .
Embodiment 3）
[0041] See image 3 , the first protective cover 4 and the second protective cover 5 of the present invention are made of high-temperature-resistant metal materials, the first protective cover 4 and the second protective cover 5 are transitionally fitted with the two ends of the brake ejector rod 1, A in the figure , B, and C parts are non-nitrided regions.
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Abstract
The invention relates to an ion nitriding process for a parking brake ejector rod of a railway vehicle. The ion nitriding process comprises the brake ejector rod and the steps of carrying out ion nitriding, annealing after forging, tempering after rough turning and destressing aging treatment before finishing on the brake ejector rod, wherein an internal threaded hole is formed in one end of the brake ejector rod, and a sealing groove is formed in the other end of the brake ejector rod. The ion nitriding process comprises the following steps: sleeving a first protective sleeve at one end, withthe internal threaded hole, of the brake ejector rod, sleeving a second protective sleeve at the other end, with the sealing groove, of the brake ejector rod, putting the brake ejector rod sleeved with the protective sleeves into a nitriding furnace for nitriding, and taking out the brake ejector rod after the nitriding furnace is naturally cooled to room temperature. The invention aims to overcome the defects in the prior art and provides the ion nitriding process for the parking brake ejector rod of the railway vehicle, which can control the influence of ion nitriding treatment on the deformation of the part size as much as possible, achieve the effect that the deformation of each size of the brake ejector rod after nitriding treatment is basically uniform and consistent, has no discreteness and ensures that machining is not needed after nitriding.
Description
technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to an ion nitriding process for a rail vehicle parking brake ejector rod. Background technique [0002] The parking brake ejector is a key part of the basic braking of high-speed rail and urban rail vehicles. It is characterized by small size, complex processing technology, high precision requirements, and difficult control of geometric dimension detection methods and processes. There are three common nitriding processes in metal heat treatment: gas nitriding, liquid nitriding and ion nitriding. The nitriding of the existing brake ejector rod generally adopts the gas nitriding treatment process. Since the two ends of the brake ejector rod have a hole structure, the special structure of the two ends makes its wall thickness different from other parts. During the nitriding process The skin effect is very easy to appear in the hole grooves at both ends of the center, resu...
Claims
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