Spheric thread cutting

Cutting outdoor threads – operation, without which it is difficult to imagine any production of machines, mechanisms or supporting structures. The riveting and point (or flat) welding here is not always appropriate, which means that the output is still screw or bolted connections.

Spheric thread cutting

Spheric thread cutting

Training

To prepare for threading with a dice – a circular cutter with internal thread made of high-speed steel, follow several actions.

  1. Dispise and align (if necessary) rod or cut pipe of a certain length.
  2. Cut the edge on which it is primarily planned to perform cutting, in a circle. This will facilitate the rotation of the dice, will ask it the desired trajectory of movement. The surround is performed at least by a millimeter of length – it has a smooth bevel in the context. Perfectly smooth troughing is performed on the lathe.
  3. Hold the cut pipe or rod into plumbing. Ideally, when the worktop of the workbench, on which they are fixed, is located at the level (or just below the level) of the worker belt. Check that the pipe or rod is perpendicular to the Earth – according to the laws of physics, it is so easier to start and control the cutting of the thread.
  4. Lubricate the inner thread of the dice and the pipe itself (or rod) by motor or transmission oil, oil throughout.
  5. Screw to the cry of manual plastics holders, or install it in a low robust machine. An ideal option will be a lathe with an adapter under a circular (machine) Plashcker.

After that, put the shoe, and start moving it around the workpiece.

Spheric thread cutting

Spheric thread cutting

Technology

Cutting the thread with a plate is carried out in a relaxed atmosphere, in a reliable place where the prerequisites for any random jerkal action are excluded. Not installed parallel to the horizon of the plate – provided that the pipe or rod is fixed strictly perpendicular – will ensure the unsuccessful start of the cutting of the screw groove around the cut base. And although the plate is leveled by herself, having passed at least a couple of turns, it is better to not allow – the first turns will become uneven, and screw the nut, as well as tighten the rod into a massive item prepared for it will be extremely difficult. The result is a noticeable threaded threaded connection of the blanks, which does not carry the maximum weight, sawing and tearing loads, which is declared according to the diameter of the “sliced” billet, dimensions of nuts and a massive part where this workpiece is subsequently screwed. If the thread is spoiled, then the wizard will grab and fade with its welding, without which the task is to do before the work on creating a threaded joint.

Spheric thread cutting

Spheric thread cutting

Aligning the shoe parallel to the ground, check it in the way of your own inner thread. A simple dice is a tool in contact with the surface of a cut pipe or a rod with four sides of the circle arcs, which is the surface of the workpiece on the transverse cut of the latter. Equifferees of the neighboring edges (arcs of this circle) from each other and from the central axis of the pipe / rod (and the tool itself) allows the swing to move exactly, provided that the beginning (two first turns) is clearly made.

Right thread is performed by twisting clockwise, left – on the contrary.

The first turns are performed extremely carefully – it is important to combine the cutting edges in the groove of the first turn, which will give the opportunity to clearly follow the one that served as “the front”. Perform the first turn of the dice at an angle of up to 90-180 degrees – you need to make sure that the process goes according to plan, the dice did not sharply fold the side in any of the directions. If it came across, and cutting the thread stopped, then it is stripped up the edge edge by turning, and try re-cutting the same thread. Even newcomers who have never kept the cry in their hands before, cutting the thread quickly becomes a simple process.

Spheric thread cutting

Spheric thread cutting

Making the first half of the turn, continue carefully, periodically returning the cry back, against the stroke of the twisting, in small angles to move it forward. The technique is: passed, for example, 10 degrees forward – half of this angular distance (in this case it is 5 degrees). That is, cutting the threads need to be jerks to prevent overheating of the dice and blanks – and, as a rule, the release of tempered high-speed steel, from which the cutting tool is made. Periodically remove (screwate) the cry and add a few droplets of the machine oil to it, remove a metal chips from the grooves tool, for which a piece of vet is used for.

Spheric thread cutting

Spheric thread cutting

Turning two turns, you can increase the intensity and amplitude of movements, for example, up to dozens of degrees – but do not overdo it: Tool and billet should not overheat. If it still happened, make a technological break – and the pipe (rod), and the plate must cool.

If you cut the thread on the lathe, then turn on the reduced gear.

Attempt to twist immediately at high speed can damage both the workpiece, and the cry, and the gearbox itself (or the engine) of the machine. Newbies instead of a wrench insert into the screwdriver an appropriate analogue of the machine plate holder, includes the lowest speed – but the screwdriver is fixed before that, for example, in vice, or with a bracket on a specially made elevation (backup) installed on the worktop table top.

Of course, you can proceed and vice versa – rotate the pipe by closing it in the lathe (or the rod in the drill / screw), and the cry is fixed in the vice. But this method will require the presence of a serious design from the stops and guides, similar to those used on a milling machine or reissimise. Do not create additional difficulties – this will turn out for you extra cost.

Spheric thread cutting

Spheric thread cutting

Cutting the thread on one billet, proceed to the next. On the factory conveyor, where the constant production of the daily standards for the preparations is needed, for example, a thousand rods per day, use a machine with cooling dies and other moving mechanisms. Cooling constantly heating from friction of the instrument is carried out, for example, using a technical vacuum cleaner attached to the pipeline of a working (closed) compartment. You can also construct a similar camera, where, in addition to the chip removal, which did not have time to stick to the oil supplied to the point, the temperature of the working dice is reset, suppose from 100 to 150 degrees, which extends its service life. The result is neat, smooth blanks, as from the manufacturer. For example, it happens the end cutting of the thread for spills from smooth (round) reinforcement.

Spheric thread cutting

Spheric thread cutting

Useful advice

Do not neglect the label lubricant (dice) and the billet itself.

Do not forget to remove the sawdust (along the cutting of the thread) from the pipe (or rod) and the dice, adding after that some more butter. Cutting “on dry” will lead to a rapid wear of the instrument, which will immediately manifest a fuzzy thread on new billets.

An attempt to impose a dust on the incomprehensible edge of the pipe or the rod significantly complicates the smooth and even beginning of the process of cutting the groove. The quality of the thread may be extremely low.

Spheric thread cutting

Spheric thread cutting

Use dies with high-speed steel steel not lower than 60 units on Rockwell scale.

Ideally – to get a tool from the 63rd alloy: such a hardness is inherent in the most expensive cutters. The use of victorious dies would not justify: the winvest alloy processes granite and concrete, and not steel. Diamond spraying on dies – too expensive measure, you do not have to cut wound rods or pipes. Avoid fakes from low-strength steel with a hardness indicator below 57: Such dies quickly deteriorate.

Spheric thread cutting

Spheric thread cutting

Do not expose tool overheating, fusing.

Do not cut the thread on the usual billet with a conical dice. Such a blank is calculated on the turning machine under the corner of the cone, referring to the drawing. Violation of this rule entails a breakdown of the dice and the billet itself. That’s right and the opposite: the cutting of the conical billet will give uneven turns with a conventional cutter, since the area of ​​contact with it is incomplete.

When cutting the thread manually with dies with non-standard carvings, movements are made to an even smaller angle, and unscrewing tool and cleaning, lubrication of the turns and cutting edges – more often. The standard step of thread for M6 is considered to be, for example, the width of the groove in 1 mm, everything that is more or less – requires a special approach.

Spheric thread cutting

Spheric thread cutting

Next, watch the video on how to cut the thread with a scatter.

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