In the previous article, we said that the problems that should be paid attention to when turning the slim rod and the method of turning the deep hole of the step, etc., many friends responded that it is really suitable to push the next content quickly, and the editor immediately arranged it on the super practical integrated transfer machine processing necessary skills, full of dry goods to you:

Method of adjusting center frame when turning large hollow workpiece

When turning the inner holes and end faces of hollow workpieces with large lengths and diameters, the center frame should be used. If the center frame is not adjusted well, when the axis line of the workpiece and the spindle line of the machine tool do not coincide, the taper error of the end concave center and the bulge and the hole will be generated during processing. In serious cases, the workpiece is removed from the chuck, resulting in an accident.

When installing such workpieces, one end of the workpiece is a three-jaw chuck or a four-jaw chuck, and the other end is placed on the center frame. Then plug a piece of wood into the hole of the workpiece or paste a piece of paper with butter on the end of the workpiece, lean the tip of the tail seat on the board or paper, choose a lower spindle speed, make the workpiece turn for one or two weeks, then the board or paper is marked out by the top of a circle, and then adjust the center frame three supports, so that the center of the circle is right to the tip of the top. This basically makes the center line of the workpiece and the spindle line of the machine tool basically coincide. After semi-finishing, if the flatness of the end face and the cylindricity of the hole are measured, the three supports of the center frame are adjusted to eliminate them.

Defect elimination method when turning slender shaft

Drum belly shape: that is, after turning, the diameter of both ends of the workpiece is small, and the middle diameter is large. The reason for this defect is due to the poor rigidity of the slender shaft, the support claw with the tool holder is not in contact with the workpiece surface, and the wear produces a gap. When turning to the middle part, due to the radial force, the turning tool presses the rotating center of the workpiece to the right side of the rotating center of the spindle, so that the cutting depth is reduced, and the rigidity of the workpiece at both ends is better, and the cutting depth is basically unchanged. Because of the "let knife" in the middle, the slender shaft is shaped into a bulge.

Elimination method: When following the tool holder claw, it must be careful to make the claw surface contact with the workpiece surface, and there should be no gap. The main declination Angle of the tool should be selected as 75° ~ 90° to reduce the radial force. With the tool rest claw, should be selected with better wear resistance cast iron.

Bamboo-shaped: The shape is like a bamboo-like, and its pitch is approximately equal to the distance between the tool rest supporting claw and the tip of the turning tool, and it appears in cycles. The reason for this defect is that the gap between the lathe's large drag plate and the middle drag plate is too large, the blank material causes centrifugal force when bending and rotating, and the "let the knife" when the knife is connected to the base cutter at the support of the tool holder, so that the diameter of the car is slightly larger than the base cutter, and the tool continue to turn, and the tool holder support claw contacts the part with the large diameter of the workpiece, so that the rotation center of the workpiece is pressed to the turning tool side. The diameter of the workpiece turned is reduced. In this way, the tool holder has been cycled to support the workpiece in different diameters, making the workpiece leave and close to the turning tool, and forming a regular bamboo shape. There are also following the tool holder claw in the walking tool, too much force, so that the rotation center of the workpiece is pressed to the turning tool side, causing the diameter of the car to become smaller, continue to walk the knife, so the cycle also forms a bamboo joint.

Method of preventing the center drill from breaking when drilling a small center hole

When drilling a center hole with a diameter of less than 1.5mm on a lathe, the center drill is very easy to break. In addition to careful drilling and frequent chip removal, that is, when drilling, do not lock the tail seat, so that the weight of the tail seat and the friction of the machine guide rail to drill. When the resistance of drilling is too large, the tailstock will retreat by itself, and protect the center drill.

Turning plane threads

The so-called plane thread is the thread processed on the end face of a cylinder or disk. The trajectory of the turning tool relative to the workpiece is an Archimedean spiral, which is different from the cylindrical thread that is often processed.

In the ordinary lathe to turn the plane thread, the light screw drive is generally used to make the lead screw of the middle drag plate turn, and drive the drag plate in the lathe to move the transverse tool to turn. This requires that each turn of the workpiece, the drag plate transversally moves the workpiece on a pitch.

When the workpiece pitch requirements are not strict, the pitch of the workpiece plane thread can be divided by the multiple of the increase in pitch of the lathe (such as the C620-1 lathe can be increased by 2, 8, 32 times), with the resulting business, select the transverse feed rate similar to the lathe nameplate, and turn the feed box handle according to the requirements, and then turn the increase pitch handle on the headstock to the increase pitch position. And turn the gear lever on the headstock to the required position, install the tool, the plane thread can be turned.

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