How to Cut Cone Thread on a Turning Machine

Tapered thread cutting on a screw-cutting lathe is carried out using a copying ruler, which is set to the value of the angle of inclination of the cone 9. The thread pitch is set in the same way as for cylindrical threads. [1]

Tapered threads are tapped on machines that have a taper ruler. According to USSR standards, the bisector of a tapered thread is perpendicular to the thread axis. The pitch is measured in the direction parallel to the axis of the thread. The mean diameter of a tapered thread has a different value in each section perpendicular to the axis, so a measurement plane is set at a distance a from the face of the tapered thread. The measurement plane specifies the values of the outside, middle and inside diameters of the thread. [2]

Tapered threading is carried out on machines that have a tapered ruler. The bisector of a tapered thread profile according to the standards adopted in the USSR is perpendicular to the thread axis. [4]

It is unacceptable to thread a tapered thread from the unprocessed surface due to possible size variations from this surface to the measuring base. Therefore, the raw surface must be counterbored before tapered threading. [6]

Tapered and self-tapping taps are used for tapered threads. [7]

Large comb heads are used for taper threading and are designed for threading cylindrical threads. [8]

Circular picks are generally used for tapered threading. Rod cutters are used very rarely; but the design is almost no different from rod cutters for cylindrical threads. [9]

It is practical to use chasers with unequal thread offsets for tapered threads with taper K. y [10]

For tapered pipe threading, pipe threading chucks mounted on special machines are used. During tapping, the chucks rotate and the tube does not rotate. [11]

Specially shaped dies are used for tapered threading. [12]

Taper thread dies are used for tapered threads. [13]

To cut tapered threads with taper k. j, it is advisable to use combs with irregular thread offset. [14]

A tapered threading scheme with taps is shown in Fig. In some cases, this scheme is also used for tapping cylindrical threads. [15]

What can be turned on a wood lathe

thread, cone, lathe

Wood turning for souvenirs, furniture is made with a wood lathe. The longitudinal, transverse, or angular turning method is used for woodwork. The choice of method depends on the type of workpiece and the desired shape.

Spoons are made in several steps. First make a sketch of the future product, transfer it to the workpiece. Then, using the machine to perform rough turning, bring the workpiece to the desired shape (for this purpose, a chisel and wheel for grinding are used). The cup-shaped part is cut with semicircular chisels; this is the next step. Then there is only one thing left to do. remove excess parts, make a sanding, draw a pattern and make a carving on the handle, finish with varnish or wax.

Rings are used as a decorative element of furniture or other wooden products. It is very easy to chisel them. get a special chisel with two cutting edges and a side. First firmly fix the workpiece and grind along the entire length (you need to leave 2-3 mm). Deepen the chisel and sharpen until the cylinder has a semicircular profile. The last step. cut out the outer profile of the ring with a chisel brought from the outside of the material to be machined.

An ordinary goblet is made of applewood or beechwood. To grind, you need a chisel with two cutting edges, and to grind the bowl, you need a chisel with two cutting edges. Half-circular side cutter, for the foot of the goblet. straight cutter on the outside.

It is also possible to make an off-center jug, which is milled in several steps:

  • The workpiece is set in the machine and roughing is performed;
  • defining the inner shape. To do this, you need to drill a hole in the end and make the center of the wood free;
  • sharpen the outside, do everything the same as on the inside;
  • shifting the center of rotation a few degrees with a second cam, repeating the procedure, only this time the center of rotation must be in the original position;
  • the last step. cleaning up the excess, sanding.

The casket can be made as a gift for a near and dear person. First round shape is given to the workpiece, using a semi-circular cutter. Next, use a narrow, straight cutter to grind the interior of the box, and then use a sharp, straight, wide cutter to smooth out the bottom. Next, sand and varnish.

On how to choose equipment and what to look for when buying, read the article: “How to choose a wood lathe

for turning pipe threads

Manual mode Pipe Thread Turning Machine

  • Oil thread lathes are used for turning pipe threads, inside and outside ,
  • They can be used to produce outer circles, bores and end faces of shafts or discs as a conventional machine tool.
  • Solid spindle headstock with precision spindle in tapered roller bearings, 2 clamping chucks on both sides
  • High torque working spindle ensures high chip removal rate for large diameter parts.
  • Heavy duty bed of premium quality cast iron with hardened and ground guides.
  • Central, practical control for feed and thread leads.
  • Wide range of inch and metric threads.
  • Hardened and ground gears.
  • Heavy-duty 4-position tool holder.
  • Cooling system included.

Spindle speed and steps: Due to the change in frequency, a smooth change in the speed of switching.

Thread milling technology:

Thread milling in workpieces with large dimensions which do not allow them to be mounted on a turning machine. Milling allows a profile to be shaped in a single pass by moving the tool along the helical interpolation.

Threading tool

Tap. Tapping of threads on the outside surface. They are made in the form of a nut. Drilled holes are drilled into the tool to receive cutting elements and to remove swarf. The die has cutting elements on each side that form a fence cone (angle 20⁰-30⁰). In the middle part there is a calibrating zone.

The strip is fixed in the collar with screws. After each revolution of the ram, it is necessary to turn it one third of its circumference backwards. This is necessary to clean the holes of chips and to obtain a quality threaded surface.

Tap. Tap used for tapping internal threads. It has cutting edges that are produced by making longitudinal or helical grooves. Grooves form the front surfaces on the teeth. The working area of a tap forms the fence and gauge areas. The tapping section is also called a cutting section. It is tapered and plunges progressively.

A distinction is made between hand, machine and wrench taps. Hand taps are made as single taps and as a set: for roughing and finishing taps. The set also consists of 3 taps. Its number is indicated by the number of circle marks on the shank (1. roughing, 2. semi-finishing, 3. finishing).

A roughing tap has the largest intake section. Taps have a square shank to transmit the working force of the collar. Taps are subdivided into through-hole and blind-hole threading. Taps are made with a straight or curved shank.

Cutter. The threads are cut by the tip of the cutter clamped in the slide as it moves relative to the rotating workpiece. In doing so, the thread pitch of the pick is equal to the distance between the vertices of the consecutive shoulder blades in the workpiece axis.

Cutters for thread cutting are structurally made:

  • Solid (made of high-speed steel or tungsten carbide);
  • With soldered tungsten carbide plates (GOST 18885-73);
  • assembled with SMP mechanical fastening (changeable polyhedral plates).

A thread cutter with a soldered or replaceable polygonal plate (SMB) must have grinding angles that ensure the production of the corresponding thread profile. Such picks are used for tapping metric and trapezoidal threads.

Cutters with SMU are used on CNC turning and milling machines, which are able to provide necessary cutting conditions and getting of a finished part in one cycle of machining (machining center).

In order to ensure the quality of threads during thread cutting, coolant (emulsion, sulfofresol and others) must be used.

High-speed steel grades for cutters: P6M5K5, P6M5, P9M4K8, P9K5, P12F3, P9M4K8.

Tapping. tapered thread

Tapered thread cutting on a screw-cutting lathe is carried out using a copying ruler, which is set to the value of the angle of inclination of the cone 9. The thread pitch is set in the same way as for cylindrical threads. [1]

Tapered threads are tapped on machines that have a taper ruler. The bisector of the profile of a tapered thread, according to the standards adopted in the USSR, is perpendicular to the axis of the thread. Pitch is measured in the direction parallel to the axis of the thread. The average diameter of a tapered thread has a different value in each section perpendicular to the axis, so a measurement plane is set on the tapered thread at a distance a from the end. The values of the outside, middle and inside diameters of the thread are indicated in the measurement plane. [2]

Tapered threads are tapped on machines that have a tapered ruler. The bisector of the tapered thread profile according to the standards adopted in the USSR is perpendicular to the thread axis. [4]

It is not permissible to taper the thread from the side of the rough surface due to possible size variations from that surface to the measuring base. The rough surface must therefore be counterbored before tapered threads can be cut. [6]

Tapered and self-tapping taps are used for tapered threads. [7]

Large comb heads for tapered threads are used for tapping cylindrical threads. [8]

Circular picks are generally used for tapered threads. Rod picks are very seldom used, but their construction is almost identical to that of rod picks for cylindrical threads. [9]

For tapered threads with taper K. y. it is advisable to use chasers with irregular thread offset. [10]

To cut a tapered thread on the pipes are used pipe threading chucks, installed on special machines. During threading, the chucks rotate and the tube does not have any rotation. [11]

Specially shaped dies are used for tapered threading. [12]

For tapered threading, dies with tapered threads are used. [13]

It is especially useful for tapered threads with taper k. j to be cut with dies with unequal thread offsets. [14]

A tapered tap threading plan is shown in Fig. In some cases this scheme is also used for tapping cylindrical threads. [15]

Tapping is one of the most common operations in metal machining. Universal turning and screw-cutting machines are used for it in serial production. These machines work with workpieces in the form of bodies of rotation and small asymmetrically shaped parts that can be mounted on the machine’s faceplate. In other cases, the thread is produced by milling, rolling and other methods.

Tapping with electric clevis

Much better productivity with the electric tongs when tapping pipe. There are special machining features when using this tool.

  • Carefully prepare the workpiece.
  • Securely clamp the workpiece in the holder.
  • Make sure the machine is in its starting point.
  • Check that the guides are free to move and the direction of rotation of the cutting part.
  • Tapping the first few threads in jog mode.

Electric tongs make it possible to set basic thread parameters including cutting length, pitch, etc., while the workpiece is rotated. п. Particular application features depend on tool model and functionality.

Tapping with electric clevis

How to cut a tapered or inside thread with a pick

Way to be accomplished on regular and CNC lathes. The workpiece containing the face is marked with a reference mark in the selected coordinate system, installed on the machine in the desired position relative to the coordinate system, and the cutter is placed on the machine slide at a given distance from the face. The workpiece is rotated and the cutter is given the necessary motion by transverse feed of the slide to the depth of cut and longitudinal movement of the slide with a feed equal to the pitch of the thread to be cut. The thread is threaded on a workpiece with a tapered surface that has a given interference fit, and the cutter is set at a distance from the principal plane of the thread with regard to the deviation Δ of the actual interference fit from the nominal fit. Threading is simplified, metal consumption is reduced, and the accuracy of the finished part is improved by compensating for the deviation of the actual interference from the nominal, which is necessary to ensure the required relative orientation of the parts connected by thread. 2 з.п. f.i., 3 ill.

The invention relates to the field of metal machining and can be used for the production of tapered threads on the parts of the double-joint.

A known method of thread cutting in which the workpiece is rotated and the cutter is provided with a pitch feed associated with its rotation. To improve thread quality and productivity, the cutter is provided with a cross feed simultaneously with the pitch feed according to the amount of change in the profile of the threaded part in a cross section, with the angle at the tip of the cutter selected smaller than the angle of the thread profile (auth. certificate. SU 299310 MPC 6. B23G 1/02, Publ. 1971 г.).

Such a method of thread cutting does not provide a thread with a fixed arrangement of thread coils in the coordinate system of the parts containing stop ledges, which does not allow using such a method for threading in the parts of a double-bearing connection.

A known method of tapered threading (Basic issues of accuracy, interchangeability and technical measurements in mechanical engineering. Under the editorship of Prof. Dr. Sci. prof. А.Н. Gavrilova M.: Mashgiz, 1958, pp. 278-280, figs. (3), in which, after threading, the end is trimmed.

However, limitation of only one limiting contour. The tapered threads are the largest for the nipple and the smallest for the socket. leads in practice to encounter either excessive interference, or to the fact that the ends of the locking connection are closed when there is a gap in the middle diameter of the thread.

In addition, in order to obtain a double-bearing connection, it is required to cut off the allowances on the ends of the parts to be connected, which complicates the production of the connection parts and increases metal consumption.

A known method of threading male or female tapered threads with a cutter on a rotating workpiece (patent RU 2250155, MPK 7 B23G1/00, publ. 2005 г.), in which the workpiece is manufactured with an allowance on the outer (inner) cylindrical surface, applied to it the reference marks in the chosen coordinate system, installed in the lathe fixture in the desired position relative to the machine coordinate system, clamped, threaded on the allowance for a given program, in the measurement plane that passes through the reference mark, measured the size from the stop ledge to the controlled thread coil, compared with the size of the setting, based on the results corrected the machine is readjusted, the remaining allowance is cut to the required contour of the external thread, and then the allowance on the stop (end) is trimmed to a size that ensures make-up with the counter part with a guaranteed interference with the required accuracy of the make-up angle.

This method allows threading with fixed location of thread coils in the coordinate system of screwed parts and increasing make-up accuracy of thread connection of parts with only cylindrical thread. In addition, by this method it is necessary to cut off the allowance by diameter and at the ends of the parts to be made up, which increases the metal consumption.

The method of processing of taper threads of pipe couplings (RU 2214320, B23G 1/00, 20) is the closest to the claimed and accepted as a prototype.10.2003), providing for tapping an external or internal tapered thread by a cutter on a rotating workpiece having a tapered surface, made with a given tension for the thread, and a stop ledge or face, and including mounting the workpiece on the machine and mounting the cutter on the machine slide and giving it motion in the form of a transverse slide feed to the cutting depth and longitudinal movement of the slide with a feed equal to the pitch of the thread to be tapped.

However, when threading tapered threads by this method, the required relative orientation of the threaded parts is not provided, which is explained by the relative reversal of the parts being joined due to the deviation of the taper tension from each other.

Turning Tapered Threads. Manual CNC

The technical objective of the invention is to create a method for threading external or internal tapered threads with a cutter that provides the required relative orientation of the parts to be connected by thread, simplifying the manufacturing of the connection parts.

The posed technical problem is solved by improving the method of threading a tapered external or internal thread on the rotating workpiece that has a tapered surface, made with a given thread tension, and a stop ledge or end, which includes setting the workpiece on the machine and installing the cutter on the machine slide and giving him motion in the form of cross-feeding the sledge to the depth of cutting and longitudinal movement of the slide with a feed, equal to the step of the thread being cut.

This improvement consists in putting a reference mark on the workpiece in the selected coordinate system and setting it on the machine in the desired position relative to the machine coordinate system, set the cutter on the machine slide at a distance from the main plane of the thread corresponding to the deviation of the actual tension from the nominal distance.

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