細軸の旋盤加工

What is a slender shaft for lathe machining?
細長いシャフトとは、長さと直径の比が次の値よりも大きいシャフトを指します。 25 (ie L/D>25).
リードスクリューなど, 滑らかなロッド, 等. 旋盤で. 細いシャフトの剛性が悪いため, 回転力の作用や影響により変形しやすい, 旋削時の熱と振動をカット. Machining errors such as straightness and concentricity appear. It is difficult to meet the technical requirements such as geometric tolerances and surface quality on the drawing, which makes turning processing very difficult. The larger the L/d value, the more difficult the turning process.

細いシャフトを旋削する技術

In the CNC machining process, it is affected by multiple factors such as machine tools and turning tools. The workpiece is prone to defects such as curved waist drum shape, polygonal shape, slub shape and so on. Especially in the grinding process, the general size is poor, and the surface roughness is required to be higher. 加えて, because the workpiece generally requires heat treatment requirements such as quenching and tempering during grinding, the cutting heat during grinding is more likely to cause deformation of the workpiece and so on. In order to prevent the bending deformation during processing, the technicians of our factory take measures from the aspects of fixtures, machine tools, process methods, operation techniques, turning tools and cutting volume.

Concentricity and perpendicularity of turning slender shaft

Improved method of turning
When CNC turning a slender shaft, the clamping method of clamping one end and tightening one end is adopted. When clamping the workpiece with a chuck, an open wind wire ring is inserted between the jaw and the workpiece to reduce the axial angle length between the workpiece and the jaw. An elastic center is used for clamping on the tailstock, so that when the workpiece is stretched by the cutting heat, the thimble can expand and contract in the axial direction to compensate for the working pavilion shape and reduce the bending of the workpiece.

Follow the knife rest
The follower is an auxiliary device of the lathe. It is used to support the workpiece near the cutting point of the tool and move longitudinally with the carriage slide. The supporting piece where the tool rest is in contact with the workpiece is generally made of wear-resistant ductile iron or bronze. The arc of the supporting claw should be ground and matched with the outer circle after rough turning to avoid scratching the workpiece. The follower tool holder can offset the influence of the radial cutting component force and the weight of the workpiece during machining, thereby reducing cutting vibration and workpiece deformation. But it must be carefully adjusted to keep the center of the follower tool holder consistent with the center of the thimble of the machine tool.

Difficulty of CNC machining of slender shaft

Angle of turning tool
In order to reduce the radial cutting force, a larger entering angle should be selected; The rake face should be ground with a chipbreaker R=1.5-3mm, and the rake angle is generally γ0=150-300; The cutting edge angle λs takes a positive value to make the chips flow to the surface to be machined; The surface roughness value of the turning tool should be small, and the cutting edge should always be kept sharp.

CNC turning volume
When turning a slender shaft, the cutting amount should be appropriately reduced compared to ordinary shaft parts. Rough turning with a cemented carbide turning tool, the cutting amount can be as follows

For fine turning, use a carbide turning tool to turn a slender shaft of φ20, φ40mm, and a length of 1000-1500mm. Optional f=0.15-0.25mm/r, ap=0.2-0.5mm, v=60-100m/s

3. Technical parameters of the slender shaft

4. シャフトの加工精度

5. シャフトメーカーのメリット
   ① 図面やサンプルの精密なカスタマイズ加工;
   ② シャフト製造企業, 以上の 20 精密シャフト加工における長年の経験, 強力な技術サポート. 高度な加工設備, 充実した検査設備と強力な物流検査チーム;
   ③ 100% 工場検査, 品質保証;
   ④ Strong productivity and short processing cycle.6. 一般的な軸材の加工

7. 表面処理

8. 厳しい検査基準
   ① 強力なQCチーム;
   ②原材料の受入検査;
   ③初回検査, 巡回検査, 抜き打ち検査;
   ④ 100% 工場検査.