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Research on Processing Technology of SS316L Stainless Steel Flange

During the processing of SS316L stainless steel flanges, certain problems were found in the first piece of trial cutting, such as low efficiency and failure to mass production, and accuracy that did not meet standards. Analyze the causes of these problems, and then take effective measures to design special fixtures and optimize the processing technology to solve the problems and improve the processing efficiency and product qualification rate of SS316L stainless steel flanges.

In the connection of two bearings and equipment, a flange is required. At present, one of the main connection methods in pipeline construction is flange connection, which has the advantages of large pressure bearing capacity and convenient disassembly. In order to study the processing technology of SS316L stainless steel flange, the flange parts of the corresponding model reducer were selected. In the actual processing, it is found that there are places that do not meet the requirements of the drawings. Based on this analysis of the actual processing problems, and optimize the processing technology to ensure the quality of flange processing.

The first trial cutting of SS316L stainless steel flange

SS316L stainless steel flange is currently a relatively common type, the chemical composition mainly includes molybdenum, nickel, chromium, sulfur, phosphorus, manganese, silicon, carbon, etc. According to the processing requirements, use Φ55mm×20mm round bar as the blank. The material is characterized by high temperature resistance, corrosion resistance, high strength, good cutting performance, and has a wide range of applications in mechanical equipment. Flange processing elements mainly include drilling, boring, milling plane, turning outer circle, etc., mainly including milling, turning and other parts. On the CNC lathe, the right side Φ52mm, Φ34mm external circle turning, and then Φ15.68mm, Φ28.3mm hole machining, Φ33mm external circle machining. Through the vertical machining center, the R1.7 arc groove, 4-Φ4.5mm hole, Φ12.2mm hole, Φ24.0mm hole, and the right inclined surface are processed. In the first trial cutting, the fixtures used by the machining center and CNC lathe were three-jaw chucks. The CNC lathe was used to machine the right outer circle and steps, and then the left outer circle and inner hole were processed. Using the three-jaw chuck of the machining center, clamp from the outer circle position on the right side, and perform arc groove milling and drilling, and then clamp the back surface, and mill the bevel and hole.
Finally, the inner groove is processed on the CNC lathe. According to the above-mentioned processing technology, the first piece of trial cutting inspection was carried out, and the results showed that the roughness of the left inner hole and the arc surface was unqualified, and the completeness of some arc processing was insufficient. The included angle between part of the hole and the axis line is insufficient, and the space position of the right inclined plane is unqualified. In addition, the processing time is longer and the processing efficiency is low.

Analysis of Processing Problems of SS316L Stainless Steel Flange

According to the results of the first piece of trial cutting, as shown in the figure on the right, there are 3 arc segments on the left side of the part, including R0.5 and 2 R1.7. The R0.5 at the 3 position is used in the CNC lathe. For processing, the 1 position R1.7 arc groove is milled with a ball-end milling cutter in the machining center, and the 5 position R1.7 is finally processed with an arc inner groove cutter on a CNC lathe. In the process of processing, for R0.5 at positions 2 and 4, when processed on a CNC lathe and a machining center, there will be burrs on the tool mark, but no corresponding treatment is made, which leads to excessive roughness. In addition, the right hole and the inclined plane are mainly carried out in the machining center, and the angle between the hole and the axis line is 12°, and the relationship between the inclined plane and the hole is spatially corresponding. The three-jaw chuck is installed on the workbench, and the parts cannot be installed every time. The location is determined. In addition, the three-jaw hydraulic chuck has been used for too long, and it is worn out, and gradually formed a flared shape. The three-jaw gradually deviates from the center of the machine tool spindle, which will increase the three-jaw centering error and increase the shape and position tolerance of the processed workpiece, thereby affecting Precision. In addition, the use of the above-mentioned processing technology for processing requires 20 minutes to complete the processing of one part, which has low efficiency and poor efficiency, mainly due to the large number of parts clamping and scattered processing procedures.

20200728033441 67724 - Research on Processing Technology of SS316L Stainless Steel Flange

Fig.1 Roughness of the left arc

Optimization of SS316L stainless steel flange processing technology

Based on the analysis of the above problems, the SS316L stainless steel flange processing technology is optimized, and the finishing process is increased. In the traditional machining process, the inner hole is processed on the CNC lathe, then the arc groove is milled in the machining center, and finally the arc inner groove is processed on the CNC lathe. In this regard, the finishing boring tool can be added to the CNC lathe for finishing operations. Using this kind of processing technology to finish processing all arc surfaces can ensure that the arc surface roughness meets the standard requirements. In addition, the special fixture is designed. For the fixture of the CNC lathe, three copper blocks are welded to the front end of the soft jaw of the three-jaw chuck, and a circular arc step shape is formed by self-boring. During the machining process, one side of the part is quickly approached at the position of the step, so that it can be accurately positioned. For machining center fixtures, the design is composed of workbenches, screws, bottom plates, positioning pins, T-shaped screws, flange parts, and support seats. The fixture bottom plate is installed on the worktable of the machining center, fixed with T-slots, and the support seat is used to ensure the spatial position relationship of the parts. Use positioning pins to fix the position during the clamping process, and then tighten the remaining screws. During the machining process, the fixed pin is removed, and the 12° bevel is milled first, and then the hole is milled. Through the design of special fixtures, processing efficiency can be effectively improved.

Conclusion

In the past SS316L stainless steel flange processing technology, there were certain problems, and the processing accuracy and processing efficiency were not ideal. Analyze the cause of the problem, make corresponding improvements and optimizations to the processing technology, improve processing accuracy through finishing, and improve processing efficiency through the design of special fixtures.

Source: China Stainless Steel Flange Manufacturer – Yaang Pipe Industry (www.epowermetals.com)

(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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