Why do you want to write this article "water wheel rotary transfer machine processing necessary skills, practical operation experience secret!" Because of the three-point turning tool, if you want to do a good lathe, the sharpening level must be excellent first, and then the combination of more and more practice, outer circle, inner hole, length, taper, thread, and then the turning practice of complex parts. The details are as follows:

Some problems should be paid attention to when turning slender shaft at high speed

"The lathe man is afraid of the rod." This statement reflects the difficulty of turning a slender rod. Due to the characteristics and technical requirements of slender shaft, it is easy to produce defects such as vibration, multi-edge, bamboo joint, poor cylindricity and bending during high-speed turning. In order to successfully turn it into a good car, we must pay full attention to the problems in the process.

1) Machine tool adjustment. The connection of the two center lines of the spindle and tailstock of the lathe must be parallel to the left and right of the large guide rail of the lathe, and the tolerance should be less than 0.02mm.

2) Workpiece installation. During installation, try not to produce over-positioning, and do not exceed 10mm when clamping one end with a chuck.

3) Knives. Κr=75° ~ 90° skew cutter, pay attention to the secondary back Angle α '0≤4° ~ 6°, must not be large. When the tool is installed, it should be slightly above the center.

4) The tool holder must be trimmed after installation, and the method of dressing can be used to research, reaming, boring, etc., so that the arc surface R in contact with the tool holder claw and the workpiece is ≥ the workpiece radius, and must not be less than the workpiece radius to prevent the generation of multiple edges. When adjusting with the tool holder claw, make the claw contact with the workpiece, do not force, to prevent the bamboo knot.

5) Auxiliary support. When the length-diameter ratio of the workpiece is greater than 40, auxiliary supports should be added during the turning process to prevent the workpiece from vibrating or swinging the workpiece due to centrifugal force. Pay attention to the adjustment of the center during the cutting process, it is appropriate to just the top of the workpiece, not tight, and adjust at any time to prevent the workpiece from thermal expansion, deformation and bending.

Problems that should be paid attention to when turning slender rod with reverse cutting tool

There are many ways to turn the slender rod, generally using the following tool holder for forward or reverse tool turning. However, the reverse tool turning has many advantages compared with the forward tool turning, and most of them are adopted.

There are two kinds of problems in turning, one is polygonal, which is mainly caused by the large rear Angle of the tool and the inconsistency between the R of the tool holder and the diameter of the workpiece; The other is the bamboo joint problem, which is caused by following the knife holder at the mouth of the shelf, when the knife is set and the knife is moved to the cutting surface, the cutting depth is changed from very small to suddenly increased, so that the cutting force changes, the workpiece is produced outward to let the knife, the diameter suddenly becomes larger, when the tool holder goes to the large diameter, the diameter of the car becomes smaller, so the cycle makes the workpiece machined into the bamboo joint shape.

Step deep hole turning method

First, the workpiece is installed on the lathe with a chuck and a center frame, and the short holes at both ends of the workpiece are machined with an inner hole knife, and each is equipped with a set and a special tool bar. When turning the middle long hole, first the left end of the supporting set of artificial parts in the hole, and then the workpiece is installed on the lathe, the length of the tool head is adjusted on the tool bar, together with the left end of the supporting sleeve into the workpiece hole, with the tool pad to adjust the height of the tool bar, the tool bar is fixed on the square tool table of the lathe, so that the tool bar can slide freely in the set, you can make the workpiece rotate and start cutting. Until the longitudinal depth of the workpiece. When the workpiece is finished, the large drag plate is moved in the reverse direction, and the right end of the support sleeve and the tool bar are withdrawn from the workpiece, and the workpiece can be removed. When processing the second piece, first install the left end of the support sleeve, install the workpiece, and then extend the tool rod into the left end of the workpiece support sleeve, install the right end of the support sleeve, you can start the second workpiece turning.

The length of the tool head extending the tool bar h, calculated according to the following formula:

Tooling features: both ends of the support sleeve to support the tool bar, greatly increase the rigidity of the tool bar, so that cutting without vibration, to ensure the roughness of the machined surface; The tool bar is turned with supporting sleeve at both ends to ensure the accuracy of the position between the holes. The operation is simple and the efficiency is more than 5 times higher than the traditional reaming method.

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