1. Home
  2. /
  3. Blog
  4. /
  5. Case Study
  6. /
  7. How to Process Stainless...

How to Process Stainless Steel Spacing Bushing Used in aerospace with CNC Turning?

Products Name:  Spacing Bushing

Application: It’s used in aerospace

Material: 304 stainless steel

Turning Problems of Stainless Steel

1. Selection of Cutting Tools

Turning stainless steel requires high heat resistance, good wear resistance, and stainless steel affinity to small cutting tool materials. It used high carbon, molybdenum system, and high vanadium high-speed steel. If the tool material has good toughness that can be selected larger rake Angle to reduce the hardened layer depth of cutting force and cutting temperature. At the same time, the blade is sharpened to make the cutting light, and the chip is not easy to bond with the tool.

2. Selection of Cutting Parameter

The cutting speed of turning stainless steel only is 40%-60% of that of turning ordinary carbon steel, if too high will cause the tool to be worn faster. The turning speed should be (50-100)m/min of general hard alloy, and the cutting speed is (10-20)m/min for a high-speed steel turning tool.

3. Selection of Cutting Fluid

In general, it’s better to choose special stainless steel turning cutting fluid, such as Duomei stainless steel turning cutting fluid for high lubrication or biodegradable water-soluble microemulsion cutting fluid. They have good cooling, lubrication, anti-rust functions, safety, and stability. The ideal processing effect can be obtained using this cutting fluid, such as improving the processing surface finish and processing efficiency, prolonging the service life of the tool, etc.

Processing Technic

Tool Quantity: 10 tools

Tool type:

90°cylindrical turning tool, 60°cylindrical turning tool, 2mmcut-off tool, ∅6 boring tools, ∅8 drills, 2mm center drill, ∅0.8 butt mill, ∅4 butt mill, ∅6 butt mill, R2 ball cutter

In order to facilitate the secondary tooling processing, we first machined this direction of the part(as shown in the picture below).In turning to process, we give priority to processing ∅9.6 round holes on the premise that is no special requirement for the outer circle of the parts. So, under the premise that the tool rigidity can’t be changed, we try our best to ensure the rigidity of the material, it can be avoided to a certain extent that the round hole is processed without seismic patterns, and ensure that the round hole is high quality.

1. Use a 2mm center drill, φ8 drill, and φ6 boring tool to finish machining the φ9.6 round hole.

2. Use a 90°cylindrical turning tool and 60°cylindrical turning tool to rough and finish machining excircle of φ13.4 and φ12.4,2mmcut-off tool machining parts height to 22.3mm until it is cut off.

According to the drawing to analyze there is a positional relationship of size R 3.38,90° and φ2.3 lug boss. In order to ensure didn’t deviation of these three sizes during the second tooling, so need to be processed together on the same tooling.

3. Use φ6 butt mill rough and finish machining ∅2.3×3.3 lug boss, then use ∅4 butt mill and ∅0.8 butt mill to machine 90° Angle.

4. Use an R2 ball cutter to rough and finish machining size R2.38.

Please refer to the finished parts below:



Leave a Reply

Table of Contents

Get a quote