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Surface treatment process of key parts of clutch driven disc assembly
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- Time of issue:2018-06-22 14:06
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(Summary description)
Surface treatment process of key parts of clutch driven disc assembly
(Summary description)
- Categories:Company News
- Author:
- Origin:
- Time of issue:2018-06-22 14:06
- Views:0
Information
At present, the surface of key metal parts, such as the driven disk, vibration damping disk, disk hub, pressure piece, gasket, etc. in the automobile clutch driven disk assembly product mostly adopts the phosphating production process, the process technology is backward, and the product appearance is not Good-looking, the surface color difference of different batches of parts is large, the size of the workpiece is affected by the phosphating time, the accuracy is difficult to control, the quality is unstable, and the sulfuric acid pollution used in the phosphating process is high; some parts are plated with zinc, chrome, nickel, etc The craftsmanship is expensive and pollutes the environment, which no longer meets the needs of enterprise development.
In order to improve the product appearance quality and surface rust prevention effect, reduce costs, it is particularly important to provide an environmentally friendly and stable quality surface treatment process for key parts of the driven disk assembly after practice verification.
Process method
The surface treatment process of the key parts of the clutch disc assembly adopts the parts to be carbonitrided first, and then used ultrasonic cleaning and shot blasting shot blasting, then tempered and baked, and finally dipped in quick-drying anti-rust oil , Fast drying surface treatment processing technology.
The process method is as follows: the parts are first carbonitrided to obtain the hardness requirements and subsequent processing conditions required for the usability of the parts. The parts after carbonitriding treatment are processed by ultrasonic cleaning and shot blasting by shot blasting machine to remove surface oxide scale, remove dirt and oil on the surface of parts, and strengthen surface structure. In order to obtain pure, clean and bright workpiece surface color in subsequent processing.
The shot blasted parts adopt the control technology of precise setting of process parameters (which can be achieved through the CNC setting and monitoring settings of the mesh belt furnace itself). Through different control of the tempering temperature and tempering time, yellow, red and blue The surface of parts of different colors such as color.
When the tempering temperature is 200℃ and the time is 60 minutes, the surface is light yellow;
When the tempering temperature is 220℃ and the time is 60 minutes, the surface is yellowish white;
When the tempering temperature is 230℃ and the time is 60 minutes, the surface is yellow;
When the tempering temperature is 240℃ and the time is 60 minutes, the surface is golden yellow;
The tempering temperature is 260℃, and the surface is red in 60 minutes;
When the tempering temperature is 280℃ and the time is 60 minutes, the surface is purple;
When the tempering temperature is 300℃ and the time is 60 minutes, the surface is blue;
Tempering temperature 320 ℃, 60 minutes, the surface is dark blue;
When the tempering temperature is 340℃ and the time is 60 minutes, the surface is blue-gray;
The tempering temperature is 370 ℃, the time is 60 minutes, the surface is light blue and gray;
When the tempering temperature is 400℃ and the time is 60 minutes, the surface is red and black;
The tempering temperature is 460 ℃, the time is 60 minutes, the surface is black;
When the metal parts are heated in the exposed oxidized air (no protective atmosphere) furnace for a short period of time, the surface color of the parts will change due to a thin and tightly attached oxide. During the tempering process, the transformation of the quenched structure is accelerated, the internal stress is eliminated, and a more stable structure is obtained.
After tempering, roasting and natural cooling, a quick-drying anti-rust oil is used for dipping or soaking treatment within one day, so that all parts are covered with anti-rust oil and placed in the drying area. Within 1 day, it is naturally dried and subjected to high-quality anti-rust treatment.
The surface treatment process is suitable for the metal surface treatment of auto parts such as driven disc assembly and cover assembly, such as driven disc, vibration damping disc, disc hub, pressure piece, gasket, diaphragm spring and other parts. Surface processing. The application and promotion of the utility model will effectively reduce the difficulty and cost of the surface treatment of key metal parts of the automobile clutch driven disc assembly, reduce waste, optimize the working environment, improve labor intensity, and simplify the production process.
Process characteristics and technical advantages
After the use of parts carbonitriding, tempering and baking technology, environmental protection without side effects. Compared with the phosphating process, there is no need to prepare chemical liquids such as phosphating solution, hydrochloric acid solution (or sulfuric acid solution), which greatly reduces environmental pollution. Compared with the electroplating process, electroplating is expensive, and has large side effects, and the hazards of pollutants such as wastewater are great. Compared with the electroplating process, the production cost is reduced by about 50%, and no pollutants such as wastewater are generated. Low production cost and low environmental pollution. In addition, the labor intensity and working environment of workers have also been significantly improved.
Using ultrasonic cleaning and shot blasting technology before tempering can effectively remove surface oxide scale, remove dirt and oil on the surface of parts, and strengthen surface structure. Compared with the phosphating process, the surface of the processed parts is cleaner, and the surface strength of the workpiece is better, and the toughness and wear resistance are more excellent.
Using precise setting and control technology of process parameters, through different control of tempering temperature and tempering time, the surface of workpieces with different colors such as yellow, red and blue can be obtained. Compared with the gray workpiece with a single phosphating process, it not only has a bright appearance, novel colors, significantly improved product grades, but also has diversity, and customers have product color options.
Using heat treatment and baking technology of metal surface oxidation, product quality and workpiece size tend to be more stable. Compared with the phosphating process, because there is no phosphating solution immersion corrosion, the size of the workpiece will not become smaller and thinner. Similarly, compared with the electroplating process, because there is no influence of the plating layer, the workpiece size will not become larger and thicker. It overcomes the problems of unstable quality and inaccurate accuracy brought by the traditional phosphating process and electroplating process to the critical dimensions of the parts.
Due to the technology of quick-drying and anti-rust oil dipping and quick-drying, the parts after tempering and roasting are covered with surface dipping. After 1 day, the surface of the workpiece is naturally dried. It changes the low-efficiency and high-strength operation method of manually wiping the anti-rust oil on the surface of the workpiece in the traditional process. And after the parts are oiled through the baking process, they will be stored for 10 months under normal storage conditions without rust. Its anti-rust performance is obviously superior to the traditional surface treatment process.
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