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Machining Technology of Thin Wall Sleeves

1. Part Analysis

A typical thin-walled sleeve is shown in Figure 1.

20220923104617 20303 - Machining Technology of Thin Wall Sleeves

Figure 1
This part belongs to the thin-walled sleeve class parts, from the drawing, there is no difficulty in the process. But from the assembly surface, the external thread M40 × 1.5-6g and the inner hole φ16H9 and the other end of the internal stop φ34H10 have coaxiality requirements, in the drawing does not give the coaxiality requirements, processing can be taken tolerance of 1/2 or 1/3. according to the normal processing method is difficult to ensure that the product drawing requirements.

2. Machining difficulties and process solutions

The wall thickness of this part is 3.5mm, the outer circle and inner hole are finished and cut off in one clamping according to the normal processing method, and the fixture is designed for clamping and turning the other end and inner hole. But the outer circle requirements are not strict, and the wall is thin, the clamping fixture must improve the accuracy of the outer circle, in order to ensure that the product requirements. Therefore, the difficulty of machining this part is the clamping process.
In order to avoid the deformation in the processing, the processing technology plan is formulated as follows:

  • (1) The blank is selected as a single piece, including the chuck size.
  • (2) Rough machining of the bore, one side of the amount left.
  • (3) Tempering treatment.
  • (4) Turn the end face, turn the outer circle to size φ60mm, turn the inner hole φ34H10 and φ33mm to size, keep the depth size (plus collet 30mm), and turn the outer empty tool (empty tool is at the collet cut off) within 30mm from the end face size, as shown in Fig. 2.
  • (5) According to the outer circle to find the correct, clamping (collet) parts, turn the end face, keep the full length size, turn the inner hole φ34mm and hole φ16H9 to size, keep the depth size, turn the outer circle and external thread to size, according to the empty tool slot cut off to ensure product quality requirements, as shown in Figure 3.

20220923104806 21407 - Machining Technology of Thin Wall Sleeves


This method of machining the sleeve, increase the collet, can ensure product quality, no deformation in machining, but this method is suitable for small batch production parts, not for large batch production. It is better to design a turning fixture for high volume production, the part must be tightened in order to apply to the fixture positioning.

20220923104843 50162 - Machining Technology of Thin Wall Sleeves


3. Conclusion

Machining thin-walled sleeve should pay attention to the following points:

  • (1) Multiple clamping completed sleeve, such as the bore accuracy, can be designed to turn the central axis, high centering accuracy, to ensure high tolerance requirements of the shape.
  • (2) The sleeve completed by multiple clamping, such as high accuracy of the outer circle, can be designed flexible fixture, the part clamping reliable.
  • (3) If the sleeve wall is thin, high precision can also be left after finishing 0.20mm, remove the parts after natural aging 1 – 2 days, and then re-clamping processing to prevent processing deformation.

Authors: Liang Qi, Li Yanping, Chen Guimei, Yin Fajun

Source:  China Thin-walled Sleeves Manufacturer:

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

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  • [1] Yang Shuzi. Handbook of machining process [M]. Beijing: Machinery Industry Press, 2002
  • [2] He Jialin. Research on CNC turning programming and process analysis of thin-walled bushings [J]. Wood Processing Machinery, 2013 (5): 11-12, 16.
  • [3] Yu Chenggang. Determination of the difficulty value of thin-walled sleeve machining [J]. Mechanical Craftsman, 2000(8):29-30.
  • [4] Wang Dawei. Discussion on the processing method of thin-walled bushings [J]. Science and Technology Innovation Herald, 2009 (6): 53.


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